c#導出導出excel的兩種方法

  
1.直接將獲取了的datatable 導出成為excel
private void proExcel_Click(object sender, EventArgs e)
        {
            System.Data.DataTable ds = new DataTable();
            frmExcel get = new frmExcel();
            ds=get.getdt();
            string fileName = "";
            string saveFileName = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xls";
            saveDialog.Filter = "Excel文件|*.xls";
            saveDialog.FileName = fileName;
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) return; //被點了取消
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("無法創建Excel對象，您的電腦可能未安裝Excel");
                return;
            }
            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 
            //寫入標題             
            for (int i = 0; i < ds.Columns.Count; i++)
            { worksheet.Cells[1, i + 1] = ds.Rows[0][i]; }
            //寫入數值
            for (int r = 0; r < ds.Rows.Count; r++)
            {
                for (int i = 0; i < ds.Columns.Count; i++)
                {
                    worksheet.Cells[r + 2, i + 1] = ds.Rows[r][i];
                }
                System.Windows.Forms.Application.DoEvents();
            }
            worksheet.Columns.EntireColumn.AutoFit();//列寬自適應
            MessageBox.Show(fileName + "資料保存成功", "提示", MessageBoxButtons.OK);
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);  //fileSaved = true;                 
                }
                catch (Exception ex)
                {//fileSaved = false;                      
                    MessageBox.Show("導出文件時出錯,文件可能正被打開！\n" + ex.Message);
                }
            }
            xlApp.Quit();
            GC.Collect();//強行銷毀   


        }



2.datagridview中的數據直接獲取后導出excle，下述代碼中dgv為 datagridview的名字

   string fileName = "";
            string saveFileName = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xls";
            saveDialog.Filter = "Excel文件|*.xls";
            saveDialog.FileName = fileName;
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) return; //被點了取消
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("無法創建Excel對象，您的電腦可能未安裝Excel");
                return;
            }
            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 
            //寫入標題             
            for (int i = 0; i < dgv.ColumnCount; i++)
            { worksheet.Cells[1, i + 1] = dgv.Columns[i].HeaderText; }
            //寫入數值
            for (int r = 0; r < dgv.Rows.Count; r++)
            {
                for (int i = 0; i < dgv.ColumnCount; i++)
                {
                    worksheet.Cells[r + 2, i + 1] = dgv.Rows[r].Cells[i].Value;
                }
                System.Windows.Forms.Application.DoEvents();
            }
            worksheet.Columns.EntireColumn.AutoFit();//列寬自適應
            MessageBox.Show(fileName + "資料保存成功", "提示", MessageBoxButtons.OK);
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);  //fileSaved = true;                 
                }
                catch (Exception ex)
                {//fileSaved = false;                      
                    MessageBox.Show("導出文件時出錯,文件可能正被打開！\n" + ex.Message);
                }
            }
            xlApp.Quit();
            GC.Collect();//強行銷毀           }