C# DataGridView 导出Excle代码和总结（转）

1、导出很快的方式；

1.1、设置数字不以科学计数法显示  设置Rang xlRang.NumberFormat = "@";就ok了。

1.2、设置一列的格式：

e.Item.Cells[1].Attributes.Add("style", "vnd.ms-excel.numberformat:@");//防止以科学计数法显示

e.Item.Cells[4].Attributes.Add("style", "vnd.ms-excel.numberformat:￥#,###.00");

public bool DataGridViewToExcelFast(DataGridView dataGridView1, string fileName, int n)
        {
            int ExcelColumns = 0;
            if (dataGridView1.Rows.Count > 65536)
            {
                if (MessageBox.Show("数据行大于Excel2003所容许的最大行数65535行，继续导出可能会引发错误，是否继续？", "提示信息", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.No)
                {
                    return false;
                }
            }
            System.Reflection.Missing miss = System.Reflection.Missing.Value;
            //创建EXCEL对象appExcel,Workbook对象,Worksheet对象,Range对象
            Microsoft.Office.Interop.Excel.Application appExcel = null;
            appExcel = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel.Workbook workbookData;
            Microsoft.Office.Interop.Excel.Worksheet worksheetData;
            Microsoft.Office.Interop.Excel.Range rangedata;
            //设置对象不可见
            appExcel.Visible = false;
            /* 在调用Excel应用程序，或创建Excel工作簿之前，记着加上下面的两行代码
            * 这是因为Excel有一个Bug，如果你的操作系统的环境不是英文的，而Excel就会在执行下面的代码时，报异常。
            */
            System.Globalization.CultureInfo CurrentCI = System.Threading.Thread.CurrentThread.CurrentCulture;
            System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
            workbookData = appExcel.Workbooks.Add(miss);
            worksheetData = (Microsoft.Office.Interop.Excel.Worksheet)workbookData.Worksheets.Add(miss, miss, miss, miss);
            //worksheetData.Cells.Style = "vnd.ms-excel.numberformat:@";
            //给工作表赋名称
            //worksheetData.Name = "MySheet";

            // 保存到WorkSheet的表头，你应该看到，是一个Cell一个Cell的存储，这样效率特别低，解决的办法是，使用Rang，一块一块地存储到Excel
            ExcelColumns = 0;
            for (int i = 0; i < dataGridView1.ColumnCount; i++)
            {
                if (!dataGridView1.Columns[i].Visible)
                {
                    continue;
                }
                worksheetData.Cells[1, ++ExcelColumns] = dataGridView1.Columns[i].HeaderText.ToString();
            }
            //先给Range对象一个范围为A2开始，Range对象可以给一个CELL的范围，也可以给例如A1到H10这样的范围
            //因为第一行已经写了表头，所以所有数据都应该从A2开始   
            rangedata = worksheetData.get_Range("A2", miss);
            Microsoft.Office.Interop.Excel.Range xlRang = null;
            //iRowCount为实际行数，最大行
            int iRowCount = dataGridView1.RowCount;
            int iParstedRow = 0, iCurrSize = 0;
            //iEachSize为每次写行的数值，可以自己设置，每次写1000行和每次写2000行大家可以自己测试下效率
            int iEachSize = 1000;
            //iColumnAccount为实际列数，最大列数
            int iColumnAccount = dataGridView1.ColumnCount;
            //在内存中声明一个iEachSize×iColumnAccount的数组，iEachSize是每次最大存储的行数，iColumnAccount就是存储的实际列数
            object[,] objVal = new object[iEachSize, iColumnAccount];
            try
            {
                iCurrSize = iEachSize;
                //计算Excel列头
                string En = NumToEn(iColumnAccount);
                while (iParstedRow < iRowCount)
                {
                    if ((iRowCount - iParstedRow) < iEachSize)
                        iCurrSize = iRowCount - iParstedRow;
                    //用FOR循环给数组赋值
                    for (int i = 0; i < iCurrSize; i++)
                    {
                        try
                        {
                            for (int j = 0; j < iColumnAccount; j++)
                            {
                                if (!dataGridView1.Columns[j].Visible)
                                {
                                    continue;
                                }
                                objVal[i, j] = dataGridView1[j, i + iParstedRow].Value == null ? "" : dataGridView1[j, i + iParstedRow].Value.ToString();
                            }
                            System.Windows.Forms.Application.DoEvents();
                        }
                        catch (Exception e)
                        {
                            MessageBox.Show(e.ToString());
                        }
                    }
                    /*
                    * 建议使用设置断点研究下哈
                    * 例如A1到H10的意思是从A到H，第一行到第十行
                    * 下句很关键，要保证获取Sheet中对应的Range范围
                    * 下句实际上是得到这样的一个代码语句xlRang = worksheetData.get_Range("A2","H100");
                    * 注意看实现的过程
                    * 'A' + iColumnAccount - 1这儿是获取你的最后列，A的数字码为65，大家可以仔细看下是不是得到最后列的字母
                    * iParstedRow + iCurrSize + 1获取最后行
                    * 若WHILE第一次循环的话这应该是A2,最后列字母+最后行数字
                    * iParstedRow + 2要注意，每次循环这个值不一样，他取决于你每次循环RANGE取了多大，循环了几次，也就是iEachSize设置值的大小哦
                    */
                    //xlRang = worksheetData.get_Range("A" + ((int)(iParstedRow + 2)).ToString(), ((char)('A' + iColumnAccount - 1)).ToString() + ((int)(iParstedRow + iCurrSize + 1)).ToString());

                    //**********从A2开始写***************                    
                    xlRang = worksheetData.get_Range("A" + ((int)(iParstedRow + 2)).ToString(), En + ((int)(iParstedRow + iCurrSize + 1)).ToString());
                    xlRang.NumberFormat = "@";
                    // 调用Range的Value2属性，把内存中的值赋给Excel
                    xlRang.Value2 = objVal;
                   
                    iParstedRow = iParstedRow + iCurrSize;
                }
                //保存工作表
                worksheetData.SaveAs(fileName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(xlRang);
                xlRang = null;
                //调用方法关闭EXCEL进程，大家可以试下不用的话如果程序不关闭在进程里一直会有EXCEL.EXE这个进程并锁定你的EXCEL表格
                this.KillSpecialExcel(appExcel);
                MessageBox.Show("数据已经成功导出到：" + fileName, "导出完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
                // 别忘了在结束程序之前恢复你的环境！                  
                System.Threading.Thread.CurrentThread.CurrentCulture = CurrentCI;
                return true;
            }
            catch (Exception ex)
            {
                this.KillSpecialExcel(appExcel);
                MessageBox.Show(ex.Message);
                return false;
            }
        }

这句不起作用：worksheetData.Cells.Style = "vnd.ms-excel.numberformat:@";我不懂是什么

2、一行一行的写出的方式；这种方式较慢！

public void DataGridViewToExcel()
        {

            SaveFileDialog kk = new SaveFileDialog();
            kk.Title = "保存EXECL文件";
            kk.Filter = "EXECL文件(*.xls) |*.xls |所有文件(*.*) |*.*";
            kk.FilterIndex = 1;
            if (kk.ShowDialog() == DialogResult.OK)
            {
                string FileName = kk.FileName + ".xls";
                if (File.Exists(FileName))
                    File.Delete(FileName);
                FileStream objFileStream;
                StreamWriter objStreamWriter;
                string strLine = "";
                objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write);
                objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
                for (int i = 0; i < ViewMaster.Columns.Count; i++)
                {
                    if (ViewMaster.Columns[i].Visible == true)
                    {
                        strLine = strLine + ViewMaster.Columns[i].HeaderText.ToString() + Convert.ToChar(9);
                    }
                }
                objStreamWriter.WriteLine(strLine);
                strLine = "";

                for (int i = 0; i < ViewMaster.Rows.Count; i++)
                {
                    if (ViewMaster.Columns[0].Visible == true)
                    {
                        if (ViewMaster.Rows[i].Cells[0].Value == null)
                            strLine = strLine + " " + Convert.ToChar(9);
                        else
                            strLine = strLine + ViewMaster.Rows[i].Cells[0].Value.ToString() + Convert.ToChar(9);
                    }
                    for (int j = 1; j < ViewMaster.Columns.Count; j++)
                    {
                        if (ViewMaster.Columns[j].Visible == true)
                        {
                            if (ViewMaster.Rows[i].Cells[j].Value == null)
                                strLine = strLine + " " + Convert.ToChar(9);
                            else
                            {
                                string rowstr = "";
                                rowstr = ViewMaster.Rows[i].Cells[j].Value.ToString();
                                if (rowstr.IndexOf("\r\n") > 0)
                                    rowstr = rowstr.Replace("\r\n", " ");
                                if (rowstr.IndexOf("\t") > 0)
                                    rowstr = rowstr.Replace("\t", " ");
                                strLine = strLine + rowstr + Convert.ToChar(9);
                            }
                        }
                    }
                    objStreamWriter.WriteLine(strLine);
                    strLine = "";
                }
                objStreamWriter.Close();
                objFileStream.Close();
                MessageBox.Show(this, "保存EXCEL成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }