单表头，多表头导出excel

一、单表头

 #region 导出
            if (this.dgvInfo.Rows.Count > 0)
            {
                SaveFileDialog saveFileDialog = new SaveFileDialog();
                saveFileDialog.DefaultExt = "xls";
                saveFileDialog.Filter = "EXCEL文件(*.XLS)|*.xls";
                saveFileDialog.FilterIndex = 0;
                saveFileDialog.FileName = "单据明细";
                saveFileDialog.RestoreDirectory = true;
                saveFileDialog.CreatePrompt = true;
                saveFileDialog.Title = "导出到EXCEL";
                saveFileDialog.ShowDialog();
                if (saveFileDialog.FileName == "")
                    return;
                Stream myStream;
                myStream = saveFileDialog.OpenFile();
                StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                string str = "";
                try
                {
                    for (int i = 0; i < this.dgvInfo.ColumnCount; i++)
                    {
                        if (i > 0)
                        {
                            str += "	";
                        }
                        str += dgvInfo.Columns[i].HeaderText;
                    }
                    sw.WriteLine(str);
                    for (int j = 0; j < dgvInfo.Rows.Count; j++)
                    {
                        string tempStr = "";
                        for (int k = 0; k < dgvInfo.Columns.Count; k++)
                        {
                            if (k > 0)
                            {
                                tempStr += "	";
                            }
                            if (dgvInfo.Rows[j].Cells[k].Value == null)
                            {
                                dgvInfo.Rows[j].Cells[k].Value = "";
                            }
                            tempStr += dgvInfo.Rows[j].Cells[k].Value.ToString();
                        }
                        sw.WriteLine(tempStr);
                    }
                    sw.Close();
                    myStream.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
                finally
                {
                    sw.Close();
                    myStream.Close();
                }
            }
            #endregion

二、表多头

 1             try
            {
                if (treedgv.Rows.Count > 0)
                {
                    string sFile = System.Windows.Forms.Application.StartupPath;

                    //Missing 在System.Reflection命名空间下。
                    //string sFileSave = sFile + "\" + DateTime.Now.ToString("yyyyMMddHHmmss") + "一天一业绩.xls";

                    SaveFileDialog saveFileDialog = new SaveFileDialog();
                    saveFileDialog.DefaultExt = "xls";
                    saveFileDialog.Filter = "EXCEL文件(*.XLS)|*.xls";
                    saveFileDialog.FilterIndex = 0;
                    saveFileDialog.FileName = DateTime.Now.ToString("yyyyMMddHHmmss") + "支付方式";
                    saveFileDialog.RestoreDirectory = true;
                    saveFileDialog.CreatePrompt = true;
                    saveFileDialog.Title = "导出到EXCEL";
                    saveFileDialog.ShowDialog();
                    if (saveFileDialog.FileName == "")
                        return;

                    //需要添加 Microsoft.Office.Interop.Excel引用 
                    Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();

                    app.Visible = false;
                    app.UserControl = true;
                    Microsoft.Office.Interop.Excel.Workbooks workbooks = app.Workbooks;
                    Microsoft.Office.Interop.Excel._Workbook workbook = workbooks.Add(sFile + "\支付方式.xls"); //加载模板
                    Microsoft.Office.Interop.Excel.Sheets sheets = workbook.Sheets;
                    Microsoft.Office.Interop.Excel._Worksheet worksheet = (Microsoft.Office.Interop.Excel._Worksheet)sheets.get_Item(1); //第一个工作薄。
                    if (worksheet == null)
                        return;  //工作薄中没有工作表.

                    ////写入数据，Excel索引从1开始。

                    for (int i = 1; i <= treedgv.Rows.Count; i++)
                    {
                        int row_ = 3 + i;  //Excel模板上表头和标题行占了2行,根据实际模板需要修改;
                        int dt_row = i - 1; //dataTable的行是从0开始的。 
                        //worksheet.Cells[row_, 1] = i.ToString();
                        for (int j = 1; j <= treedgv.Columns.Count; j++)
                        {
                            if (treedgv.Rows[0].Cells["Column" + j].Value.ToString() != "")
                            {
                                worksheet.Cells[row_, j] = treedgv.Rows[i-1].Cells["Column" + j].Value.ToString();
                            }
                        }

                    }


                    workbook.SaveAs(saveFileDialog.FileName, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);


                    workbook.Close(null, null, null);
                    workbooks.Close();
                    worksheet = null;
                    app.Quit();
                    app = null;
                }
            }
            catch (Exception)
            {

                MessageBox.Show("导出失败！", "异常");
            }