C# - VS2019 DataGridView导出到Excel的三种方法

 //原文出处：http://www.yongfa365.com/Item/DataGridViewToExcel.html
  1 #region DataGridView数据显示到Excel
 /// <summary>
 /// 打开Excel并将DataGridView控件中数据导出到Excel
 /// </summary>
 /// <param name="dgv">DataGridView对象 </param>
 /// <param name="isShowExcle">是否显示Excel界面 </param>
 /// <remarks>
 /// add com "Microsoft Excel 11.0 Object Library"
 /// using Excel=Microsoft.Office.Interop.Excel;
 /// </remarks>
 /// <returns> </returns>
 public bool DataGridviewShowToExcel(DataGridView dgv, bool isShowExcle)
 {
     if (dgv.Rows.Count == )
         return false;
     //建立Excel对象
     Excel.Application excel = new Excel.Application();
     excel.Application.Workbooks.Add(true);
     excel.Visible = isShowExcle;
     //生成字段名称
     for (int i = ; i < dgv.ColumnCount; i++)
     {
         excel.Cells[, i + ] = dgv.Columns[i].HeaderText;
     }
     //填充数据
     for (int i = ; i < dgv.RowCount - ; i++)
     {
         for (int j = ; j < dgv.ColumnCount; j++)
         {
             if (dgv[j, i].ValueType == typeof(string))
             {
                 excel.Cells[i + , j + ] = "'" + dgv[j, i].Value.ToString();
             }
             else
             {
                 excel.Cells[i + , j + ] = dgv[j, i].Value.ToString();
             }
         }
     }
     return true;
 }
 #endregion 

 #region DateGridView导出到csv格式的Excel
 /// <summary>
 /// 常用方法，列之间加\t，一行一行输出，此文件其实是csv文件，不过默认可以当成Excel打开。
 /// </summary>
 /// <remarks>
 /// using System.IO;
 /// </remarks>
 /// <param name="dgv"></param>
 private void DataGridViewToExcel(DataGridView dgv)
 {
     SaveFileDialog dlg = new SaveFileDialog();
     dlg.Filter = "Execl files (*.xls)|*.xls";
     dlg.FilterIndex = ;
     dlg.RestoreDirectory = true;
     dlg.CreatePrompt = true;
     dlg.Title = "保存为Excel文件";

     if (dlg.ShowDialog() == DialogResult.OK)
     {
         Stream myStream;
         myStream = dlg.OpenFile();
         StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-));
         string columnTitle = "";
         try
         {
             //写入列标题
             for (int i = ; i < dgv.ColumnCount; i++)
             {
                 if (i > )
                 {
                     columnTitle += "\t";
                 }
                 columnTitle += dgv.Columns[i].HeaderText;
             }
             sw.WriteLine(columnTitle);

             //写入列内容
             for (int j = ; j < dgv.Rows.Count; j++)
             {
                 string columnValue = "";
                 for (int k = ; k < dgv.Columns.Count; k++)
                 {
                     if (k > )
                     {
                         columnValue += "\t";
                     }
                     if (dgv.Rows[j].Cells[k].Value == null)
                         columnValue += "";
                     else
                         columnValue += dgv.Rows[j].Cells[k].Value.ToString().Trim();
                 }
                 sw.WriteLine(columnValue);
             }
             sw.Close();
             myStream.Close();
         }
         catch (Exception e)
         {
             MessageBox.Show(e.ToString());
         }
         finally
         {
             sw.Close();
             myStream.Close();
         }
     }
 }
 #endregion

 #region DataGridView导出到Excel，有一定的判断性
 /// <summary>
 ///方法，导出DataGridView中的数据到Excel文件
 /// </summary>
 /// <remarks>
 /// add com "Microsoft Excel 11.0 Object Library"
 /// using Excel=Microsoft.Office.Interop.Excel;
 /// using System.Reflection;
 /// </remarks>
 /// <param name= "dgv"> DataGridView </param>
 public static void DataGridViewToExcel(DataGridView dgv)
 {

     #region   验证可操作性

     //申明保存对话框
     SaveFileDialog dlg = new SaveFileDialog();
     //默然文件后缀
     dlg.DefaultExt = "xls ";
     //文件后缀列表
     dlg.Filter = "EXCEL文件(*.XLS)|*.xls ";
     //默然路径是系统当前路径
     dlg.InitialDirectory = Directory.GetCurrentDirectory();
     //打开保存对话框
     if (dlg.ShowDialog() == DialogResult.Cancel) return;
     //返回文件路径
     string fileNameString = dlg.FileName;
     //验证strFileName是否为空或值无效
     if (fileNameString.Trim() == " ")
     { return; }
     //定义表格内数据的行数和列数
     int rowscount = dgv.Rows.Count;
     int colscount = dgv.Columns.Count;
     //行数必须大于0
     if (rowscount <= )
     {
         MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
         return;
     }

     //列数必须大于0
     if (colscount <= )
     {
         MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
         return;
     }

     //行数不可以大于65536
     if (rowscount > )
     {
         MessageBox.Show("数据记录数太多(最多不能超过65536条)，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
         return;
     }

     //列数不可以大于255
     if (colscount > )
     {
         MessageBox.Show("数据记录行数太多，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
         return;
     }

     //验证以fileNameString命名的文件是否存在，如果存在删除它
     FileInfo file = new FileInfo(fileNameString);
     if (file.Exists)
     {
         try
         {
             file.Delete();
         }
         catch (Exception error)
         {
             MessageBox.Show(error.Message, "删除失败 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
             return;
         }
     }
     #endregion
     Excel.Application objExcel = null;
     Excel.Workbook objWorkbook = null;
     Excel.Worksheet objsheet = null;
     try
     {
         //申明对象
         objExcel = new Microsoft.Office.Interop.Excel.Application();
         objWorkbook = objExcel.Workbooks.Add(Missing.Value);
         objsheet = (Excel.Worksheet)objWorkbook.ActiveSheet;
         //设置EXCEL不可见
         objExcel.Visible = false;

         //向Excel中写入表格的表头
         int displayColumnsCount = ;
         for (int i = ; i <= dgv.ColumnCount - ; i++)
         {
             if (dgv.Columns[i].Visible == true)
             {
                 objExcel.Cells[, displayColumnsCount] = dgv.Columns[i].HeaderText.Trim();
                 displayColumnsCount++;
             }
         }
         //设置进度条
         //tempProgressBar.Refresh();
         //tempProgressBar.Visible   =   true;
         //tempProgressBar.Minimum=1;
         //tempProgressBar.Maximum=dgv.RowCount;
         //tempProgressBar.Step=1;
         //向Excel中逐行逐列写入表格中的数据
         for (int row = ; row <= dgv.RowCount - ; row++)
         {
             //tempProgressBar.PerformStep(); 

             displayColumnsCount = ;
             for (int col = ; col < colscount; col++)
             {
                 if (dgv.Columns[col].Visible == true)
                 {
                     try
                     {
                         objExcel.Cells[row + , displayColumnsCount] = dgv.Rows[row].Cells[col].Value.ToString().Trim();
                         displayColumnsCount++;
                     }
                     catch (Exception)
                     {

                     }

                 }
             }
         }
         //隐藏进度条
         //tempProgressBar.Visible   =   false;
         //保存文件
         objWorkbook.SaveAs(fileNameString, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
                 Missing.Value, Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value,
                 Missing.Value, Missing.Value);
     }
     catch (Exception error)
     {
         MessageBox.Show(error.Message, "警告 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
         return;
     }
     finally
     {
         //关闭Excel应用
         if (objWorkbook != null) objWorkbook.Close(Missing.Value, Missing.Value, Missing.Value);
         if (objExcel.Workbooks != null) objExcel.Workbooks.Close();
         if (objExcel != null) objExcel.Quit();

         objsheet = null;
         objWorkbook = null;
         objExcel = null;
     }
     MessageBox.Show(fileNameString + "\n\n导出完毕! ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);

 }

 #endregion

         #region DataGridView导出到Excel解决打开时报后缀名不一致的问题
         /// <summary>
         /// DataGridView导出至Excel,解决问题:打开Excel文件格式与扩展名指定格式不一致
         /// </summary>
         /// <param name="dataGridView">数据源表格</param>
         /// <param name="isShowExcle">导出时是否显示excel界面</param>
         /// <returns></returns>
         public static bool DcExcel(DataGridView dataGridView, bool isShowExcle = true)
         {
             int FormatNum;//保存excel文件的格式
             Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
             string excelVersion = excel.Version;//获取你使用的excel 的版本号 

             //声明保存对话框
             SaveFileDialog saveFileDialog = new SaveFileDialog();
             //默然文件后缀
             saveFileDialog.DefaultExt = "xls";

             if (Convert.ToDouble(excelVersion) < )//You use Excel 97-2003
             {
                 FormatNum = -;
                 //文件后缀列表
                 saveFileDialog.Filter = "Excel(*.xls)|*.xls";
             }
             else//you use excel 2007 or later
             {
                 FormatNum = ;
                 //文件后缀列表
                 saveFileDialog.Filter = "Excel(*.xls)|*.xls|Excel(2007-2016)(*.xlsx)|*.xlsx";
             }
             Form fr = dataGridView.Parent as Form;
             if (fr != null)//默认文件名
             {
                 saveFileDialog.FileName = fr.Text;
             }
             //默然路径是系统当前路径
             saveFileDialog.InitialDirectory = Directory.GetCurrentDirectory();
             //打开保存对话框
             if (saveFileDialog.ShowDialog() == DialogResult.Cancel)
                 return false;
             //返回文件路径
             string fileName = saveFileDialog.FileName;
             if (string.IsNullOrEmpty(fileName.Trim()))
             { return false; }
             if (dataGridView.Rows.Count == )
                 return false;
             //建立Excel对象      

             var objWorkbook = excel.Application.Workbooks.Add(true);
             excel.Visible = isShowExcle;
             //生成字段名称
             for (int i = ; i < dataGridView.ColumnCount; i++)
             {
                 excel.Cells[, i + ] = dataGridView.Columns[i].HeaderText;
                 excel.Cells[, i + ].Font.Bold = true;
             }
             //填充数据
             for (int i = ; i < dataGridView.RowCount - ; i++)
             {
                 for (int j = ; j < dataGridView.ColumnCount; j++)
                 {
                     if (dataGridView[j, i].ValueType == typeof(string))
                     {
                         excel.Cells[i + , j + ] = "'" + dataGridView[j, i].Value.ToString();
                     }
                     else
                     {
                         excel.Cells[i + , j + ] = dataGridView[j, i].Value.ToString();
                     }
                 }
             }
             //Excel.XlFileFormat.xlOpenXMLWorkbook（.xlsx）
             //Excel.XlFileFormat.xlExcel8（Excel97 - 2003, .xls）
             //判断excel文件的保存格式是xls还是xlsx
             var format = fileName.EndsWith(".xls") ? Microsoft.Office.Interop.Excel.XlFileFormat.xlExcel8 : Microsoft.Office.Interop.Excel.XlFileFormat.xlOpenXMLWorkbook;
             objWorkbook.SaveAs(fileName, format, Missing.Value, Missing.Value, Missing.Value,
                 Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value,
                 Missing.Value, Missing.Value);
             return true;
         }
         #endregion