DataGridView生成CSV,XML 和 EXCEL文件

这里提到了使用DataGridView 去生成三种不同类型的文件，其实生成EXCEL我曾经遇到过三种，希望这些对广大开发者有帮助。并且当中我还列出一些如何通过xls导入到datagridview,很多使用该winform技术的同仁一定很熟悉这种方法。

1.首先是如何将数据从 xls文件加载到winform的DataGridView控件中。

private void button1_Click(object sender, EventArgs e)
       {
           OpenFileDialog fileDLG = new OpenFileDialog();
           fileDLG.Title = "Open Excel File";
           fileDLG.Filter = "Excel Files|*.xls;*.xlsx";
           fileDLG.InitialDirectory = @"C:\Users\...\Desktop\";
           if (fileDLG.ShowDialog() == DialogResult.OK)
           {
               string filename = System.IO.Path.GetFileName(fileDLG.FileName);
               string path = System.IO.Path.GetDirectoryName(fileDLG.FileName);
               excelLocationTB.Text = @path + "\\" + filename;
               string ExcelFile = @excelLocationTB.Text;
               if (!File.Exists(ExcelFile))
                   MessageBox.Show(String.Format("File {0} does not Exist", ExcelFile));

               OleDbConnection theConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ExcelFile + ";Extended Properties=Excel 12.0;");
               theConnection.Open();
               OleDbDataAdapter theDataAdapter = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", theConnection);
               DataSet DS = new DataSet();
               theDataAdapter.Fill(DS, "ExcelInfo");
               dataGridView1.DataSource = DS.Tables["ExcelInfo"];
               formatDataGrid();
               MessageBox.Show("Excel File Loaded");
               toolStripProgressBar1.Value += 0;
           }
       }
             private void formatDataGrid()
          {
             dataGridView1.ColumnHeadersVisible = true;
             dataGridView1.Columns[0].Name = "Path Name";
             dataGridView1.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader);
           }

 private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog fileDLG = new OpenFileDialog();
            fileDLG.Title = "Open Excel File";
            fileDLG.Filter = "Excel Files|*.xls;*.xlsx";
            fileDLG.InitialDirectory = @"C:\Users\...\Desktop\";
            if (fileDLG.ShowDialog() == DialogResult.OK)
            {
                string filename = System.IO.Path.GetFileName(fileDLG.FileName);
                string path = System.IO.Path.GetDirectoryName(fileDLG.FileName);
                excelLocationTB.Text = @path + "\\" + filename;
                string ExcelFile = @excelLocationTB.Text;
                if (!File.Exists(ExcelFile))
                    MessageBox.Show(String.Format("File {0} does not Exist", ExcelFile));

                OleDbConnection theConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ExcelFile + ";Extended Properties=Excel 12.0;");
                theConnection.Open();
                OleDbDataAdapter theDataAdapter = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", theConnection);
                DataSet DS = new DataSet();
                theDataAdapter.Fill(DS, "ExcelInfo");
                dataGridView1.DataSource = DS.Tables["ExcelInfo"];
                formatDataGrid();
                MessageBox.Show("Excel File Loaded");
                toolStripProgressBar1.Value += 0;
            }
        }
              private void formatDataGrid()
           {
              dataGridView1.ColumnHeadersVisible = true;
              dataGridView1.Columns[0].Name = "Path Name";
              dataGridView1.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCellsExceptHeader);
            }

 

2.接下来如何将DataGridView控件中的数据保存到CSV格式的文件中。

if (dataGridView1.Rows.Count == 0)
                  {
                      MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                      return;
                  }
                  else
                  {
                      SaveFileDialog saveFileDialog = new SaveFileDialog();
                      saveFileDialog.Filter = "CSV files (*.csv)|*.csv";
                      saveFileDialog.FilterIndex = 0;
                      saveFileDialog.RestoreDirectory = true;
                      saveFileDialog.CreatePrompt = true;
                      saveFileDialog.FileName = null;
                      saveFileDialog.Title = "Save path of the file to be exported";
                      if (saveFileDialog.ShowDialog() == DialogResult.OK)
                      {
                          Stream myStream = saveFileDialog.OpenFile();
                          StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                          string strLine = "";
                          try
                          {
                              //Write in the headers of the columns.
                              for (int i = 0; i < dataGridView1.ColumnCount; i++)
                              {
                                  if (i > 0)
                                      strLine += ",";
                                  strLine += dataGridView1.Columns[i].HeaderText;
                              }
                              strLine.Remove(strLine.Length - 1);
                              sw.WriteLine(strLine);
                              strLine = "";
                              //Write in the content of the columns.
                              for (int j = 0; j < dataGridView1.Rows.Count; j++)
                              {
                                  strLine = "";
                                  for (int k = 0; k < dataGridView1.Columns.Count; k++)
                                  {
                                      if (k > 0)
                                          strLine += ",";
                                      if (dataGridView1.Rows[j].Cells[k].Value == null)
                                          strLine += "";
                                      else
                                      {
                                          string m = dataGridView1.Rows[j].Cells[k].Value.ToString().Trim();
                                          strLine += m.Replace(",", "，");
                                      }
                                  }
                                  strLine.Remove(strLine.Length - 1);
                                  sw.WriteLine(strLine);
                                  //Update the Progess Bar.
                                  toolStripProgressBar1.Value = 100 * (j + 1) / dataGridView1.Rows.Count;
                              }
                              sw.Close();
                              myStream.Close();
                              MessageBox.Show("Data has been exported to：" + saveFileDialog.FileName.ToString(), "Exporting Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
                              toolStripProgressBar1.Value = 0;
                          }
                          catch (Exception ex)
                          {
                              MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                          }
                      }
                  }

if (dataGridView1.Rows.Count == 0)
                  {
                      MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                      return;
                  }
                  else
                  {
                      SaveFileDialog saveFileDialog = new SaveFileDialog();
                      saveFileDialog.Filter = "CSV files (*.csv)|*.csv";
                      saveFileDialog.FilterIndex = 0;
                      saveFileDialog.RestoreDirectory = true;
                      saveFileDialog.CreatePrompt = true;
                      saveFileDialog.FileName = null;
                      saveFileDialog.Title = "Save path of the file to be exported";
                      if (saveFileDialog.ShowDialog() == DialogResult.OK)
                      {
                          Stream myStream = saveFileDialog.OpenFile();
                          StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                          string strLine = "";
                          try
                          {
                              //Write in the headers of the columns.
                              for (int i = 0; i < dataGridView1.ColumnCount; i++)
                              {
                                  if (i > 0)
                                      strLine += ",";
                                  strLine += dataGridView1.Columns[i].HeaderText;
                              }
                              strLine.Remove(strLine.Length - 1);
                              sw.WriteLine(strLine);
                              strLine = "";
                              //Write in the content of the columns.
                              for (int j = 0; j < dataGridView1.Rows.Count; j++)
                              {
                                  strLine = "";
                                  for (int k = 0; k < dataGridView1.Columns.Count; k++)
                                  {
                                      if (k > 0)
                                          strLine += ",";
                                      if (dataGridView1.Rows[j].Cells[k].Value == null)
                                          strLine += "";
                                      else
                                      {
                                          string m = dataGridView1.Rows[j].Cells[k].Value.ToString().Trim();
                                          strLine += m.Replace(",", "，");
                                      }
                                  }
                                  strLine.Remove(strLine.Length - 1);
                                  sw.WriteLine(strLine);
                                  //Update the Progess Bar.
                                  toolStripProgressBar1.Value = 100 * (j + 1) / dataGridView1.Rows.Count;
                              }
                              sw.Close();
                              myStream.Close();
                              MessageBox.Show("Data has been exported to：" + saveFileDialog.FileName.ToString(), "Exporting Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
                              toolStripProgressBar1.Value = 0;
                          }
                          catch (Exception ex)
                          {
                              MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                          }
                      }
                  }

 

3.接下是如何保存到XML,这里提供了两种方法。

 Output to XML file format using StreamWriting Object.
if (dataGridView1.Rows.Count == 0)
{
    MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
    return;
}
else
{
    SaveFileDialog saveFileDialog = new SaveFileDialog();
    saveFileDialog.Filter = "XML files (*.xml)|*.xml";
    saveFileDialog.FilterIndex = 0;
    saveFileDialog.RestoreDirectory = true;
    saveFileDialog.CreatePrompt = true;
    saveFileDialog.FileName = null;
    saveFileDialog.Title = "Save path of the file to be exported";
    if (saveFileDialog.ShowDialog() == DialogResult.OK)
    {
        Stream myStream = saveFileDialog.OpenFile();
        StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
        try
        {
            sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");
            sw.WriteLine("<NewXML>");

            for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
            {
                sw.WriteLine("<Row" + i + ">");
                for (int j = 0; j < dataGridView1.Columns.Count; j++)
                    sw.WriteLine("<" + dataGridView1.Columns[j].HeaderText + ">" + dataGridView1.Rows[i].Cells[j].Value.ToString().Trim() + "</" + dataGridView1.Columns[j].HeaderText + ">");
                sw.WriteLine("</Row" + i + ">");
                //Update the Progess Bar.
                toolStripProgressBar1.Value = 100 * (i + 1) / (dataGridView1.Rows.Count - 1);
            }
            sw.WriteLine("</NewXML>");
            sw.Close();
            myStream.Close();
            MessageBox.Show("Data has been exported to：" + saveFileDialog.FileName.ToString(), "Exporting Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
            toolStripProgressBar1.Value = 0;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

                   Output to XML file format using StreamWriting Object.
                  if (dataGridView1.Rows.Count == 0)
                  {
                      MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                      return;
                  }
                  else
                  {
                      SaveFileDialog saveFileDialog = new SaveFileDialog();
                      saveFileDialog.Filter = "XML files (*.xml)|*.xml";
                      saveFileDialog.FilterIndex = 0;
                      saveFileDialog.RestoreDirectory = true;
                      saveFileDialog.CreatePrompt = true;
                      saveFileDialog.FileName = null;
                      saveFileDialog.Title = "Save path of the file to be exported";
                      if (saveFileDialog.ShowDialog() == DialogResult.OK)
                      {
                          Stream myStream = saveFileDialog.OpenFile();
                          StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                          try
                          {
                              sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");
                              sw.WriteLine("<NewXML>");

                              for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                              {
                                  sw.WriteLine("<Row" + i + ">");
                                  for (int j = 0; j < dataGridView1.Columns.Count; j++)
                                      sw.WriteLine("<" + dataGridView1.Columns[j].HeaderText + ">" + dataGridView1.Rows[i].Cells[j].Value.ToString().Trim() + "</" + dataGridView1.Columns[j].HeaderText + ">");
                                  sw.WriteLine("</Row" + i + ">");
                                  //Update the Progess Bar.
                                  toolStripProgressBar1.Value = 100 * (i + 1) / (dataGridView1.Rows.Count - 1);
                              }
                              sw.WriteLine("</NewXML>");
                              sw.Close();
                              myStream.Close();
                              MessageBox.Show("Data has been exported to：" + saveFileDialog.FileName.ToString(), "Exporting Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
                              toolStripProgressBar1.Value = 0;
                          }
                          catch (Exception ex)
                          {
                              MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                          }
                      }
                  }

上面是hard code写法，用XMLELEMENT也能达到同样目的。

if (dataGridView1.Rows.Count == 0)
                 {
                     MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                     return;
                 }
                 else
                 {
                     SaveFileDialog saveFileDialog = new SaveFileDialog();
                     saveFileDialog.Filter = "XML files (*.xml)|*.xml";
                     saveFileDialog.FilterIndex = 0;
                     saveFileDialog.RestoreDirectory = true;
                     saveFileDialog.CreatePrompt = true;
                     saveFileDialog.FileName = null;
                     saveFileDialog.Title = "Save path of the file to be exported";
                     if (saveFileDialog.ShowDialog() == DialogResult.OK)
                     {
                         string str = saveFileDialog.FileName;
                        XmlDocument doc = new XmlDocument();
                         XmlNode docNode = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
                              doc.AppendChild(docNode);

                           // Create and insert a new element.
                           XmlNode rowsNode = doc.CreateElement("NewXML");
                           doc.AppendChild(rowsNode);

                         try
                         {
                             for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                             {
                                 XmlNode rowNode = doc.CreateElement("row" + i);


                                 for (int j = 0; j < dataGridView1.Columns.Count; j++)
                                 {

                                     XmlAttribute rowAttribute = doc.CreateAttribute(dataGridView1.Columns[j].HeaderText);
                                       rowAttribute.Value =dataGridView1.Rows[i].Cells[j].Value.ToString().Trim() ;
                                       rowNode.Attributes.Append(rowAttribute);
                                       rowsNode.AppendChild(rowNode);
                                 }
                                 //Update the Progess Bar.
                                 toolStripProgressBar1.Value = 100 * (i + 1) / (dataGridView1.Rows.Count - 1);

                             }
                             doc.Save(str);

                         }
                         catch (Exception ex)
                         {
                             MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                         }
                     }
                 }

 if (dataGridView1.Rows.Count == 0)
                  {
                      MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                      return;
                  }
                  else
                  {
                      SaveFileDialog saveFileDialog = new SaveFileDialog();
                      saveFileDialog.Filter = "XML files (*.xml)|*.xml";
                      saveFileDialog.FilterIndex = 0;
                      saveFileDialog.RestoreDirectory = true;
                      saveFileDialog.CreatePrompt = true;
                      saveFileDialog.FileName = null;
                      saveFileDialog.Title = "Save path of the file to be exported";
                      if (saveFileDialog.ShowDialog() == DialogResult.OK)
                      {
                          string str = saveFileDialog.FileName;
                         XmlDocument doc = new XmlDocument();
                          XmlNode docNode = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
                               doc.AppendChild(docNode);

                            // Create and insert a new element.
                            XmlNode rowsNode = doc.CreateElement("NewXML");
                            doc.AppendChild(rowsNode);

                          try
                          {
                              for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                              {
                                  XmlNode rowNode = doc.CreateElement("row" + i);


                                  for (int j = 0; j < dataGridView1.Columns.Count; j++)
                                  {

                                      XmlAttribute rowAttribute = doc.CreateAttribute(dataGridView1.Columns[j].HeaderText);
                                        rowAttribute.Value =dataGridView1.Rows[i].Cells[j].Value.ToString().Trim() ;
                                        rowNode.Attributes.Append(rowAttribute);
                                        rowsNode.AppendChild(rowNode);
                                  }
                                  //Update the Progess Bar.
                                  toolStripProgressBar1.Value = 100 * (i + 1) / (dataGridView1.Rows.Count - 1);

                              }
                              doc.Save(str);

                          }
                          catch (Exception ex)
                          {
                              MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                          }
                      }
                  }

3.最后提供保存到EXCEL的三种方法，第一种是hardcode,第二种是openxml pacage,第三种是传统的操作Excl interp的貌似是 Automatic方法。

if (dataGridView1.Rows.Count == 0)
{
    MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
    return;
}
else
{
    SaveFileDialog saveFileDialog = new SaveFileDialog();
    saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
    saveFileDialog.FilterIndex = 0;
    saveFileDialog.RestoreDirectory = true;
    saveFileDialog.CreatePrompt = true;
    saveFileDialog.FileName = null;
    saveFileDialog.Title = "Save path of the file to be exported";
    if (saveFileDialog.ShowDialog() == DialogResult.OK)
    {
        Stream myStream = saveFileDialog.OpenFile();
        StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
        string strLine = "";
        try
        {
            //Write in the headers of the columns.
            for (int i = 0; i < dataGridView1.ColumnCount; i++)
            {
                if (i > 0)
                    strLine += Convert.ToChar(9);
                strLine += dataGridView1.Columns[i].HeaderText;
            }
            strLine.Remove(strLine.Length - 1);
            sw.WriteLine(strLine);
            strLine = "";
            //Write in the content of the columns.
            for (int j = 0; j < dataGridView1.Rows.Count; j++)
            {
                strLine = "";
                for (int k = 0; k < dataGridView1.Columns.Count; k++)
                {
                    if (k > 0)
                        strLine += Convert.ToChar(9);
                    if (dataGridView1.Rows[j].Cells[k].Value == null)
                        strLine += "";
                    else
                    {
                        string m = dataGridView1.Rows[j].Cells[k].Value.ToString().Trim();
                        strLine += m.Replace(",", "，");
                    }
                }
                strLine.Remove(strLine.Length - 1);
                sw.WriteLine(strLine);
                //Update the Progess Bar.
                toolStripProgressBar1.Value = 100 * (j + 1) / dataGridView1.Rows.Count;
            }
            sw.Close();
            myStream.Close();
            MessageBox.Show("Data has been exported to：" + saveFileDialog.FileName.ToString(), "Exporting Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
            toolStripProgressBar1.Value = 0;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

                      if (dataGridView1.Rows.Count == 0)
                      {
                          MessageBox.Show("No data available!", "Prompt", MessageBoxButtons.OK, MessageBoxIcon.Information);
                          return;
                      }
                      else
                      {
                          SaveFileDialog saveFileDialog = new SaveFileDialog();
                          saveFileDialog.Filter = "Execl files (*.xls)|*.xls";
                          saveFileDialog.FilterIndex = 0;
                          saveFileDialog.RestoreDirectory = true;
                          saveFileDialog.CreatePrompt = true;
                          saveFileDialog.FileName = null;
                          saveFileDialog.Title = "Save path of the file to be exported";
                          if (saveFileDialog.ShowDialog() == DialogResult.OK)
                          {
                              Stream myStream = saveFileDialog.OpenFile();
                              StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                              string strLine = "";
                              try
                              {
                                  //Write in the headers of the columns.
                                  for (int i = 0; i < dataGridView1.ColumnCount; i++)
                                  {
                                      if (i > 0)
                                          strLine += Convert.ToChar(9);
                                      strLine += dataGridView1.Columns[i].HeaderText;
                                  }
                                  strLine.Remove(strLine.Length - 1);
                                  sw.WriteLine(strLine);
                                  strLine = "";
                                  //Write in the content of the columns.
                                  for (int j = 0; j < dataGridView1.Rows.Count; j++)
                                  {
                                      strLine = "";
                                      for (int k = 0; k < dataGridView1.Columns.Count; k++)
                                      {
                                          if (k > 0)
                                              strLine += Convert.ToChar(9);
                                          if (dataGridView1.Rows[j].Cells[k].Value == null)
                                              strLine += "";
                                          else
                                          {
                                              string m = dataGridView1.Rows[j].Cells[k].Value.ToString().Trim();
                                              strLine += m.Replace(",", "，");
                                          }
                                      }
                                      strLine.Remove(strLine.Length - 1);
                                      sw.WriteLine(strLine);
                                      //Update the Progess Bar.
                                      toolStripProgressBar1.Value = 100 * (j + 1) / dataGridView1.Rows.Count;
                                  }
                                  sw.Close();
                                  myStream.Close();
                                  MessageBox.Show("Data has been exported to：" + saveFileDialog.FileName.ToString(), "Exporting Completed", MessageBoxButtons.OK, MessageBoxIcon.Information);
                                  toolStripProgressBar1.Value = 0;
                              }
                              catch (Exception ex)
                              {
                                  MessageBox.Show(ex.Message, "Exporting Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
                              }
                          }
                      }

Automatic：

int iRows = 0;
int iCols = 0;
int iTrueCols = 0;
Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook wb = app.Workbooks.Add(System.Reflection.Missing.Value);
Microsoft.Office.Interop.Excel.Worksheet ws = null;

if (wb.Worksheets.Count > 0)
{
    ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.get_Item(1);
}
else
{
    wb.Worksheets.Add(System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value);
    ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.get_Item(1);
}

if (ws != null)
{
    ws.Name = "SheetName";

    iRows = dataGridView1.Rows.Count;      //加上列头行
    iTrueCols = dataGridView1.Columns.Count;   //包含隐藏的列，一共有多少列

    //求列数，省略Visible = false的列
    for (int i = 0; i < dataGridView1.Columns.Count; i++)
    {
        if (dataGridView1.Columns[i].Visible) iCols++;
    }

    string[,] dimArray = new string[iRows + 1, iCols];

    for (int j = 0, k = 0; j < iTrueCols; j++)
    {
        //省略Visible = false的列
        if (dataGridView1.Columns[j].Visible)
        {
            dimArray[0, k] = dataGridView1.Columns[j].HeaderText;
            k++;
        }
    }

    for (int i = 0; i < iRows; i++)
    {
        for (int j = 0, k = 0; j < iTrueCols; j++)
        {
            //省略Visible = false的列
            if (dataGridView1.Columns[j].Visible)
            {
                if (dataGridView1.Rows[i].Cells[j].Value != null)
                    dimArray[i + 1, k] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                else
                    dimArray[i + 1, k] = "";
                k++;

            }

        }

    }




    ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[iRows + 1, iCols] as Microsoft.Office.Interop.Excel.Range).Value2 = dimArray;
    ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[1, iCols] as Microsoft.Office.Interop.Excel.Range).Font.Bold = true;
    ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[iRows + 1, iCols] as Microsoft.Office.Interop.Excel.Range).Font.Size = 10.0;
    ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[iRows + 1, iCols] as Microsoft.Office.Interop.Excel.Range).RowHeight = 14.25;
    //ws.Columns[.ColumnWidth = datagridview.Columns[0].Width;
    for (int j = 0, k = 0; j < iTrueCols; j++)
    {
        //省略Visible = false的列
        if (dataGridView1.Columns[j].Visible)
        {
            ws.get_Range(ws.Cells[1, k + 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[1, k + 1] as Microsoft.Office.Interop.Excel.Range).ColumnWidth = (dataGridView1.Columns[j].Width / 8.4) > 255 ? 255 : (dataGridView1.Columns[j].Width / 8.4);
            //ws.Columns.c = datagridview.Columns[j].Width;
            k++;
        }
    }
}
app.Visible = true;

                          int iRows = 0;
                          int iCols = 0;
                          int iTrueCols = 0;
                          Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
                          Microsoft.Office.Interop.Excel.Workbook wb = app.Workbooks.Add(System.Reflection.Missing.Value);
                          Microsoft.Office.Interop.Excel.Worksheet ws = null;

                          if (wb.Worksheets.Count > 0)
                          {
                              ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.get_Item(1);
                          }
                          else
                          {
                              wb.Worksheets.Add(System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value);
                              ws = (Microsoft.Office.Interop.Excel.Worksheet)wb.Worksheets.get_Item(1);
                          }

                          if (ws != null)
                          {
                              ws.Name = "SheetName";

                              iRows = dataGridView1.Rows.Count;      //加上列头行  
                              iTrueCols = dataGridView1.Columns.Count;   //包含隐藏的列，一共有多少列  

                              //求列数，省略Visible = false的列  
                              for (int i = 0; i < dataGridView1.Columns.Count; i++)
                              {
                                  if (dataGridView1.Columns[i].Visible) iCols++;
                              }

                              string[,] dimArray = new string[iRows + 1, iCols];

                              for (int j = 0, k = 0; j < iTrueCols; j++)
                              {
                                  //省略Visible = false的列  
                                  if (dataGridView1.Columns[j].Visible)
                                  {
                                      dimArray[0, k] = dataGridView1.Columns[j].HeaderText;
                                      k++;
                                  }
                              }

                              for (int i = 0; i < iRows; i++)
                              {
                                  for (int j = 0, k = 0; j < iTrueCols; j++)
                                  {
                                      //省略Visible = false的列  
                                      if (dataGridView1.Columns[j].Visible)
                                      {
                                          if (dataGridView1.Rows[i].Cells[j].Value != null)
                                              dimArray[i + 1, k] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                                          else
                                              dimArray[i + 1, k] = "";
                                          k++;

                                      }

                                  }

                              }




                              ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[iRows + 1, iCols] as Microsoft.Office.Interop.Excel.Range).Value2 = dimArray;
                              ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[1, iCols] as Microsoft.Office.Interop.Excel.Range).Font.Bold = true;
                              ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[iRows + 1, iCols] as Microsoft.Office.Interop.Excel.Range).Font.Size = 10.0;
                              ws.get_Range(ws.Cells[1, 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[iRows + 1, iCols] as Microsoft.Office.Interop.Excel.Range).RowHeight = 14.25;
                              //ws.Columns[.ColumnWidth = datagridview.Columns[0].Width;  
                              for (int j = 0, k = 0; j < iTrueCols; j++)
                              {
                                  //省略Visible = false的列  
                                  if (dataGridView1.Columns[j].Visible)
                                  {
                                      ws.get_Range(ws.Cells[1, k + 1] as Microsoft.Office.Interop.Excel.Range, ws.Cells[1, k + 1] as Microsoft.Office.Interop.Excel.Range).ColumnWidth = (dataGridView1.Columns[j].Width / 8.4) > 255 ? 255 : (dataGridView1.Columns[j].Width / 8.4);
                                      //ws.Columns.c = datagridview.Columns[j].Width;  
                                      k++;
                                  }
                              }
                          }
                          app.Visible = true;

 

OpenXml： 

 

string myStream = saveFileDialog.FileName;

                         

                          CreateSpreadsheetWorkbook(myStream,dvtodt(dataGridView1));

string myStream = saveFileDialog.FileName;

                         

                          CreateSpreadsheetWorkbook(myStream,dvtodt(dataGridView1));

先将DataGridView转换为DataTable,在操作：

public static void CreateSpreadsheetWorkbook(string filepath, DataTable dt)
          {


              // Create a spreadsheet document by supplying the filepath.
              // By default, AutoSave = true, Editable = true, and Type = xlsx.
              FileInfo fileInfo = new FileInfo(filepath);
              if (fileInfo.Exists)
                  fileInfo.Delete();

              SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(filepath, SpreadsheetDocumentType.Workbook);

              // Add a WorkbookPart to the document.
              WorkbookPart workbookPart = spreadsheetDocument.AddWorkbookPart();
              workbookPart.Workbook = new Workbook();

              // Add a WorksheetPart to the WorkbookPart.
              WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
              worksheetPart.Worksheet = new Worksheet(new SheetData());

              // Add a workStylesPart to the workbookPart.
              WorkbookStylesPart workStylesPart = workbookPart.AddNewPart<WorkbookStylesPart>();
              workStylesPart.Stylesheet = new Stylesheet();

              // Add a Stylesheet to the workStylesPart.
              WorkbookStylesPart workbookStylesPart = spreadsheetDocument.WorkbookPart.WorkbookStylesPart;
              Stylesheet styleSheet = workbookStylesPart.Stylesheet;

              // Add Fonts and other some information.
              Fonts fonts = new Fonts() { Count = (UInt32Value)2U, KnownFonts = true };

              // Add based font to Fonts.
              Font font = new Font();
              FontSize fontSize = new FontSize() { Val = 11D };
              Color color = new Color() { Theme = (UInt32Value)1U };
              FontName fontName = new FontName() { Val = "Calibri" };
              FontFamilyNumbering fontFamilyNumbering = new FontFamilyNumbering() { Val = 2 };
              FontScheme fontScheme = new FontScheme() { Val = FontSchemeValues.Minor };
              font.Append(fontSize);
              font.Append(color);
              font.Append(fontName);
              font.Append(fontFamilyNumbering);
              font.Append(fontScheme);

              // Add fontSpecial to Fonts.
              Font fontSpecial = new Font();
              Bold bold = new Bold();
              FontSize fontSizeSpecial = new FontSize() { Val = 11D };
              Color colorSpecial = new Color() { Theme = (UInt32Value)1U };
              FontName fontNameSpecial = new FontName() { Val = "Calibri" };
              FontFamilyNumbering fontFamilyNumberingSpecial = new FontFamilyNumbering() { Val = 2 };
              FontScheme fontSchemeSpecial = new FontScheme() { Val = FontSchemeValues.Minor };
              fontSpecial.Append(bold);
              fontSpecial.Append(fontSizeSpecial);
              fontSpecial.Append(colorSpecial);
              fontSpecial.Append(fontNameSpecial);
              fontSpecial.Append(fontFamilyNumberingSpecial);
              fontSpecial.Append(fontSchemeSpecial);

              // Add font and fontSpecial to fonts collection.
              fonts.Append(font);
              fonts.Append(fontSpecial);

              // Fills.When the object is serialized out as xml, its qualified name is x:fills.
              Fills fills = new Fills() { Count = (UInt32Value)2U };
              Fill fill = new Fill();

              // Pattern.When the object is serialized out as xml, its qualified name is x:patternFill.
              PatternFill patternFill = new PatternFill() { PatternType = PatternValues.None };
              fill.Append(patternFill);

              // This patternFillSpecial served for fillSpecial.
              Fill fillSpecial = new Fill();
              PatternFill patternFillSpecial = new PatternFill() { PatternType = PatternValues.Gray125 };
              fillSpecial.Append(patternFillSpecial);

              // Add fill and fillSpecial to fills collection.
              fills.Append(fill);
              fills.Append(fillSpecial);

              // Borders.When the object is serialized out as xml, its qualified name is x:borders.
              Borders borders = new Borders() { Count = (UInt32Value)1U };
              Border border = new Border();

              // Left Border.When the object is serialized out as xml, its qualified name is x:left.
              LeftBorder leftBorder = new LeftBorder();

              // Right Border.When the object is serialized out as xml, its qualified name is x:right.
              RightBorder rightBorder = new RightBorder();

              //Top Border.When the object is serialized out as xml, its qualified name is x:top.
              TopBorder topBorder = new TopBorder();

              // Bottom Border.When the object is serialized out as xml, its qualified name is x:bottom.
              BottomBorder bottomBorder = new BottomBorder();

              // This element specifies the color and line style for the diagonal border(s) of a cell,
              // possibly including diagonally up and diagonally down.
              DiagonalBorder diagonalBorder = new DiagonalBorder();

              // Add leftBorder, rightBorder,topBorder,bottomBorder and diagonalBorder into border.
              border.Append(leftBorder);
              border.Append(rightBorder);
              border.Append(topBorder);
              border.Append(bottomBorder);
              border.Append(diagonalBorder);
              borders.Append(border);

              // This is the critical object when the sample want to bold the cell format.
              CellStyleFormats cellStyleFormats = new CellStyleFormats() { Count = (UInt32Value)1U };
              CellFormat cellFormat = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)0U, FillId = (UInt32Value)0U, BorderId = (UInt32Value)0U };

              // Add cellFormat to cellStyleFormats
              cellStyleFormats.Append(cellFormat);
              CellFormats cellFormats = new CellFormats() { Count = (UInt32Value)2U };
              CellFormat cellFormatSpecial = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)0U, FillId = (UInt32Value)0U, BorderId = (UInt32Value)0U, FormatId = (UInt32Value)0U };
              CellFormat cellFormatAnotherSpecial = new CellFormat() { NumberFormatId = (UInt32Value)0U, FontId = (UInt32Value)1U, FillId = (UInt32Value)0U, BorderId = (UInt32Value)0U, FormatId = (UInt32Value)0U, ApplyFont = true };
              cellFormats.Append(cellFormatSpecial);
              cellFormats.Append(cellFormatAnotherSpecial);
              CellStyles cellStyles = new CellStyles() { Count = (UInt32Value)1U };
              CellStyle cellStyle = new CellStyle() { Name = "Normal", FormatId = (UInt32Value)0U, BuiltinId = (UInt32Value)0U };
              cellStyles.Append(cellStyle);
              DifferentialFormats differentialFormats = new DifferentialFormats() { Count = (UInt32Value)0U };
              TableStyles tableStyles = new TableStyles() { Count = (UInt32Value)0U, DefaultTableStyle = "TableStyleMedium2", DefaultPivotStyle = "PivotStyleLight16" };
              StylesheetExtensionList stylesheetExtensionList = new StylesheetExtensionList();
              StylesheetExtension stylesheetExtension = new StylesheetExtension() { Uri = "{EB79DEF2-80B8-43e5-95BD-54CBDDF9020C}" };
              stylesheetExtension.AddNamespaceDeclaration("x14", "http://schemas.microsoft.com/office/spreadsheetml/2009/9/main");
              stylesheetExtensionList.Append(stylesheetExtension);

              // Add fonts,fills,borders,cellStyleFormats,cellFormats,cellStyles,differentialFormats,tableStyles and stylesheetEntensionList to styleSheet
              styleSheet.Append(fonts);
              styleSheet.Append(fills);
              styleSheet.Append(borders);
              styleSheet.Append(cellStyleFormats);
              styleSheet.Append(cellFormats);
              styleSheet.Append(cellStyles);
              styleSheet.Append(differentialFormats);
              styleSheet.Append(tableStyles);
              styleSheet.Append(stylesheetExtensionList);

              // Save the result.
              styleSheet.Save();

              // Add Sheets to the Workbook.
              Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());

              // Append a new worksheet and associate it with the workbook.
              Sheet sheet = new Sheet() { Id = spreadsheetDocument.WorkbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = "mySheet" };
              sheets.Append(sheet);
              string cl = "";
              uint row = 2;
              int index;
              Cell cell;

              // fill data into Excel file
              foreach (DataRow dr in dt.Rows)
              {
                  for (int idx = 0; idx < dt.Columns.Count; idx++)
                  {
                      if (idx >= 26)
                          cl = "A" + Convert.ToString(Convert.ToChar(65 + idx - 26));
                      else
                          cl = Convert.ToString(Convert.ToChar(65 + idx));

                      SharedStringTablePart shareStringPart;
                      if (spreadsheetDocument.WorkbookPart.GetPartsOfType<SharedStringTablePart>().Count() > 0)
                      {
                          shareStringPart = spreadsheetDocument.WorkbookPart.GetPartsOfType<SharedStringTablePart>().First();
                      }
                      else
                      {
                          shareStringPart = spreadsheetDocument.WorkbookPart.AddNewPart<SharedStringTablePart>();
                      }
                      if (row == 2)
                      {
                          index = InsertSharedStringItem(dt.Columns[idx].ColumnName, shareStringPart);
                          cell = InsertCellInWorksheet(cl, row - 1, worksheetPart);
                          cell.CellValue = new CellValue(index.ToString());
                          cell.DataType = new EnumValue<CellValues>(CellValues.SharedString);
                      }

                      // Insert the text into the SharedStringTablePart.
                      index = InsertSharedStringItem(dr[idx].ToString(), shareStringPart);
                      cell = InsertCellInWorksheet(cl, row, worksheetPart);
                      cell.CellValue = new CellValue(index.ToString());
                      cell.DataType = new EnumValue<CellValues>(CellValues.SharedString);
                  }

                  row++;
              }

              // Save the workbookPart.
              workbookPart.Workbook.Save();

              // Close the document.
              spreadsheetDocument.Close();
          }


          /// <summary>
          /// Insert SharedStringItem object.
          /// </summary>
          private static int InsertSharedStringItem(string text, SharedStringTablePart shareStringPart)
          {

              // If the part does not contain a SharedStringTable, create one.
              if (shareStringPart.SharedStringTable == null)
              {
                  shareStringPart.SharedStringTable = new SharedStringTable();
              }
              int i = 0;

              // Iterate through all the items in the SharedStringTable. If the text already exists, return its index.
              foreach (SharedStringItem item in shareStringPart.SharedStringTable.Elements<SharedStringItem>())
              {
                  if (item.InnerText == text)
                  {
                      return i;
                  }
                  i++;
              }

              // The text does not exist in the part. Create the SharedStringItem and return its index.
              shareStringPart.SharedStringTable.AppendChild(new SharedStringItem(new DocumentFormat.OpenXml.Spreadsheet.Text(text)));
              shareStringPart.SharedStringTable.Save();
              return i;
          }

          /// <summary>
          /// Insert cell in worksheet.
          /// </summary>
          private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
          {
              Worksheet worksheet = worksheetPart.Worksheet;
              SheetData sheetData = worksheet.GetFirstChild<SheetData>();
              string cellReference = columnName + rowIndex;

              // If the worksheet does not contain a row with the specified row index, insert one.
              Row row;
              if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
              {
                  row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
              }
              else
              {
                  row = new Row() { RowIndex = rowIndex };
                  sheetData.Append(row);
              }

              // If there is not a cell with the specified column name, insert one.
              if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
              {
                  return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
              }
              else
              {

                  // Cells must be in sequential order according to CellReference.
                  // Determine where to insert the new cell.
                  Cell refCell = null;
                  Cell newCell = new Cell() { CellReference = cellReference };
                  row.InsertBefore(newCell, refCell);
                  worksheet.Save();
                  return newCell;

              }
          }