C#快速汇出DataTable到Excel文件

项目中需要将DataTable中的内容汇出到Excel文件中，采用循环的方式逐个Cell写数据到Excel文件中，代码如下：

    //把数据表的内容导出到Excel文件中
    public static void OutDataToExcel2(System.Data.DataTable srcDataTable, string excelFilePath)
    {
        Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
        object missing = System.Reflection.Missing.Value;

        //导出到execl 
        try
        {
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，可能您的电脑未安装Excel!");
                return;
            }

            Microsoft.Office.Interop.Excel.Workbooks xlBooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook xlBook = xlBooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet xlSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlBook.Worksheets[1];

            //让后台执行设置为不可见，为true的话会看到打开一个Excel，然后数据在往里写
            xlApp.Visible = false;
            //生成Excel中列头名称
            for (int i = 0; i < srcDataTable.Columns.Count; i++)
            {
                xlSheet.Cells[1, i + 1] = srcDataTable.Columns[i].ColumnName;//输出DataGridView列头名
            }

            //把DataGridView当前页的数据保存在Excel中 
            if (srcDataTable.Rows.Count > 0)
            {
                for (int i = 0; i < srcDataTable.Rows.Count; i++)//控制Excel中行
                {
                    for (int j = 0; j < srcDataTable.Columns.Count; j++)//控制Excel中列
                    {
                        xlSheet.Cells[i + 2, j + 1] = srcDataTable.Rows[i][j];//i控制行，从Excel中第2行开始输出第一行数据，j控制列，从Excel中第1列输出第1列数据
                    }
                }
            }

            //设置禁止弹出保存和覆盖的询问提示框
            xlApp.DisplayAlerts = false;
            xlApp.AlertBeforeOverwriting = false;

            if (xlSheet != null)
            {
                xlSheet.SaveAs(excelFilePath, missing, missing, missing, missing, missing, missing, missing, missing, missing);
                KillProcess(xlApp);
            }
        }
        catch (Exception ex)
        {
            KillProcess(xlApp);
            throw ex;
        }
    }

    测试时发现很不好，汇出一个19列203行的Table时，用时竟然高达24秒多。

    后来采用整体赋值的方法修改，代码如下：

    //把数据表的内容导出到Excel文件中
    public static void OutDataToExcel(System.Data.DataTable srcDataTable, string excelFilePath)
    {
        Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
        object missing = System.Reflection.Missing.Value;

        //导出到execl 
        try
        {
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，可能您的电脑未安装Excel!");
                return;
            }

            Microsoft.Office.Interop.Excel.Workbooks xlBooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook xlBook = xlBooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet xlSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlBook.Worksheets[1];

            //让后台执行设置为不可见，为true的话会看到打开一个Excel，然后数据在往里写
            xlApp.Visible = false;

            object[,] objData = new object[srcDataTable.Rows.Count + 1, srcDataTable.Columns.Count];
            //首先将数据写入到一个二维数组中
            for (int i = 0; i < srcDataTable.Columns.Count; i++)
            {
                objData[0, i] = srcDataTable.Columns[i].ColumnName;
            }
            if (srcDataTable.Rows.Count > 0)
            {
                for (int i = 0; i < srcDataTable.Rows.Count; i++)
                {
                    for (int j = 0; j < srcDataTable.Columns.Count; j++)
                    {
                        objData[i + 1, j] = srcDataTable.Rows[i][j];
                    }
                }
            }

            string startCol = "A";
            int iCnt = (srcDataTable.Columns.Count / 26);
            string endColSignal = (iCnt == 0 ? "" : ((char)('A' + (iCnt - 1))).ToString());
            string endCol = endColSignal + ((char)('A' + srcDataTable.Columns.Count - iCnt * 26 - 1)).ToString();
            Excel.Range range = xlSheet.get_Range(startCol + "1", endCol + (srcDataTable.Rows.Count - iCnt * 26 + 1).ToString());

            range.Value = objData; //给Exccel中的Range整体赋值
            range.EntireColumn.AutoFit(); //设定Excel列宽度自适应
            xlSheet.get_Range(startCol + "1", endCol + "1").Font.Bold = 1;//Excel文件列名 字体设定为Bold

            //设置禁止弹出保存和覆盖的询问提示框
            xlApp.DisplayAlerts = false;
            xlApp.AlertBeforeOverwriting = false;

            if (xlSheet != null)
            {
                xlSheet.SaveAs(excelFilePath, missing, missing, missing, missing, missing, missing, missing, missing, missing);
                //xlApp.Quit();
                KillProcess(xlApp);
            }
        }
        catch (Exception ex)
        {
            KillProcess(xlApp);
            throw ex;
        }
    }

 

测试之前的19列203行的DataTable，用时为4秒多一些。