方法一、利用微软的excel 操作类

引用：using Excel = Microsoft.Office.Interop.Excel;

代码如下:

        #region导出数据表：Excle (微软的excel 操作类)
        ///<summary>
        ///导出数据表：Excle
        ///</summary>
        ///<param name="myDGV"></param>
        public void _ToExcel(DataGridView myDGV)
        {
            string path = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xlsx";
            saveDialog.Filter = "Excel文件|*.xlsx";
            saveDialog.ShowDialog();
            path = saveDialog.FileName;
            if (path.IndexOf(":") < 0) return; //判断是否点击取消
            try
            {
                Excel.Application xlApp = new Excel.Application();
                if (xlApp == null)
                {
                    MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
                    return;
                }
                Excel.Workbooks workbooks = xlApp.Workbooks;
                Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
                Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
                int colIndex = 0;
                //写入标题
                for (int i = 0; i < myDGV.ColumnCount; i++)
                {
                    if (myDGV.Columns[i].Visible)//用作于不导出隐藏列
                    {
                        colIndex++;
                        worksheet.Cells[1, colIndex] = myDGV.Columns[i].HeaderText;
                        //worksheet.Cells[1, i] = myDGV.Columns[i].HeaderText;
                    }
                }
                //写入数值
                for (int r = 0; r < myDGV.Rows.Count - 1; r++)
                {
                    colIndex = 0;
                    for (int i = 0; i < myDGV.ColumnCount; i++)
                    {
                        if (myDGV.Columns[i].Visible)
                        {
                            colIndex++;
                            worksheet.Cells[r + 2, colIndex] = myDGV.Rows[r].Cells[i].Value;
                        }
                    }
                    System.Windows.Forms.Application.DoEvents();
                }
                worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
                if (path != "")
                {
                    try
                    {
                        workbook.Saved = true;
                        workbook.SaveCopyAs(path);
                        //fileSaved = true;
                    }
                    catch (Exception ex)
                    {
                        //fileSaved = false;
                        MessageBox.Show("导出文件时出错,文件可能正被打开！\n\r" + ex.Message);
                    }
                }
                xlApp.Quit();
                GC.Collect();//强行销毁
                // if (fileSaved && System.IO.File.Exists(saveFileName)) System.Diagnostics.Process.Start(saveFileName); //打开EXCEL
 
                MessageBox.Show(path + "，导出成功", "系统提示", MessageBoxButtons.OK);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            } 
        }
        #endregion

方法二、IO基础流操作类

引用：using System.IO;

using System.Threading;

代码如下：

        #region导出数据表：Excle (io流操作类)
        ///<summary>
        ///导出数据表：Excle (io流操作类)
        ///</summary>
        ///<param name="myDGV"></param>
        public void _ToExcel2(DataGridView myDGV)
        {
            string path = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xls";
            saveDialog.Filter = "Excel97-2003 (*.xls)|*.xls|All Files (*.*)|*.*";
            saveDialog.ShowDialog();
            path = saveDialog.FileName;
            if (path.IndexOf(":") < 0) return; //判断是否点击取消
            try
            {
                Thread.Sleep(1000);
                StreamWriter sw = new StreamWriter(path, false, Encoding.GetEncoding("gb2312"));
                StringBuilder sb = new StringBuilder();
                //写入标题
                for (int k = 0; k < myDGV.Columns.Count; k++)
                {
                    if (myDGV.Columns[k].Visible)//导出可见的标题
                    {
                        //"\t"就等于键盘上的Tab,加个"\t"的意思是: 填充完后进入下一个单元格.
                        sb.Append(myDGV.Columns[k].HeaderText.ToString().Trim() + "\t");
                    }
                }
                sb.Append(Environment.NewLine);//换行
                //写入每行数值
                for (int i = 0; i < myDGV.Rows.Count - 1; i++)
                {
                    System.Windows.Forms.Application.DoEvents();
                    for (int j = 0; j < myDGV.Columns.Count; j++)
                    {
                        if (myDGV.Columns[j].Visible)//导出可见的单元格
                        {
                            //注意单元格有一定的字节数量限制,如果超出,就会出现两个单元格的内容是一模一样的.
                            //具体限制是多少字节,没有作深入研究.
                            sb.Append(myDGV.Rows[i].Cells[j].Value.ToString().Trim() + "\t");
                        }
                    }
                    sb.Append(Environment.NewLine); //换行
                }
                sw.Write(sb.ToString());
                sw.Flush();
                sw.Close();
                MessageBox.Show(path + "，导出成功", "系统提示", MessageBoxButtons.OK);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            } 
        }
        #endregion

         二种方法对比，利用IO基础流导出到Excel表格中的速度最快。特别是上10万行以上的数据，更是能体现其速度。

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C#WinForm 直接导出DataGridView数据到Excel表格的二种方法对比