本次的代碼是根據以前的asp.net DataTable2Excel 類修改而來，並進行了優化，使用方法與asp.net版相同。
本例用到了Microsoft.Office.Interop.Excel.dll，版本 12.0.4518.1014
asp.net DataTable2Excel 類的文章鏈接：C#
DataTable 導出 Excel 進階 多行表頭、合併單元格、中文文件名亂碼
using System;
using System.Collections.Generic;
using System.Web;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Data.OleDb;
using System.Web.UI.WebControls;
using System.Text.RegularExpressions;
using System.IO;
using System.Text;
using System.Web.UI;
namespace DataTable2Excel
{
/// <summary>
/// Common 的摘要說明
/// 作者：李偉波
/// 時間：2016-4-8
/// </summary>
public class Common
{
public Common()
{
//
//TODO: 在此處添加構造函數邏輯
//
}
/// <summary>
/// 描述：把DataTable內容導出excel並返回客戶端
/// 作者：李偉波
/// 時間：2016-4-8
/// </summary>
/// <param name="dtData"></param>
/// <param name="header"></param>
/// <param name="fileName"></param>
/// <param name="mergeCellNums">要合併的列索引字典 格式：列索引-合併模式(合併模式 1 合併相同項、2 合併空項、3 合併相同項及空項)</param>
/// <param name="mergeKey">作爲合併項的標記列索引</param>
public static void DataTable2Excel(System.Data.DataTable dtData, TableCell[] header, string fileName, Dictionary<int, int> mergeCellNums, int? mergeKey)
{
System.Web.UI.WebControls.GridView gvExport = null;
// IO用於導出並返回excel文件
StringWriter strWriter = null;
HtmlTextWriter htmlWriter = null;
if (dtData != null)
{
// 導出excel文件
strWriter = new StringWriter();
htmlWriter = new HtmlTextWriter(strWriter);
// 重新定義一個無分頁的GridView
gvExport = new System.Web.UI.WebControls.GridView();
gvExport.DataSource = dtData.DefaultView;
gvExport.AllowPaging = false;
//優化導出數據顯示，如身份證、12-1等顯示異常問題
gvExport.RowDataBound += new System.Web.UI.WebControls.GridViewRowEventHandler(dgExport_RowDataBound);
gvExport.DataBind();
//處理表頭
if (header != null && header.Length > 0)
{
gvExport.HeaderRow.Cells.Clear();
gvExport.HeaderRow.Cells.AddRange(header);
}
//合併單元格
if (mergeCellNums != null && mergeCellNums.Count > 0)
{
foreach (int cellNum in mergeCellNums.Keys)
{
MergeRows(gvExport, cellNum, mergeCellNums[cellNum], mergeKey);
}
}
// 返回客戶端
gvExport.RenderControl(htmlWriter);
StreamWriter sw = new StreamWriter(fileName, false, Encoding.GetEncoding("gb2312"));
sw.Write("<meta http-equiv=\"content-type\" content=\"application/ms-excel; charset=gb2312\"/>" + strWriter.ToString());
sw.Flush();
sw.Close();
sw.Dispose();
strWriter.Close();
strWriter.Dispose();
//保存的文件並不是真正的Excel格式，用Excel打開會有格式不一致的提示，爲了更好的體驗，保存爲Excel2003格式。
SaveAsExcel2003(fileName);
}
}
/// <summary>
/// 描述：行綁定事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected static void dgExport_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
foreach (TableCell cell in e.Row.Cells)
{
//優化導出數據顯示，如身份證、12-1等顯示異常問題
if (Regex.IsMatch(cell.Text.Trim(), @"^\d{12,}$") || Regex.IsMatch(cell.Text.Trim(), @"^\d+[-]\d+$"))
{
cell.Attributes.Add("style", "vnd.ms-excel.numberformat:@");
}
}
}
}
/// <summary>
/// 描述：合併GridView列中相同的行
/// 作者：李偉波
/// 時間：2016-4-8
/// </summary>
/// <param name="gvExport">GridView對象</param>
/// <param name="cellNum">需要合併的列</param>
/// <param name="mergeMode">合併模式 1 合併相同項、2 合併空項、3 合併相同項及空項</param>
/// <param name="mergeKey">作爲合併項的標記列索引</param>
public static void MergeRows(GridView gvExport, int cellNum, int mergeMode, int? mergeKey)
{
int i = 0, rowSpanNum = 1;
System.Drawing.Color alterColor = System.Drawing.Color.LightGray;
while (i < gvExport.Rows.Count - 1)
{
GridViewRow gvr = gvExport.Rows[i];
for (++i; i < gvExport.Rows.Count; i++)
{
GridViewRow gvrNext = gvExport.Rows[i];
if ((!mergeKey.HasValue || (mergeKey.HasValue && (gvr.Cells[mergeKey.Value].Text.Equals(gvrNext.Cells[mergeKey.Value].Text) || " ".Equals(gvrNext.Cells[mergeKey.Value].Text)))) && ((mergeMode == 1 && gvr.Cells[cellNum].Text == gvrNext.Cells[cellNum].Text) || (mergeMode == 2 && " ".Equals(gvrNext.Cells[cellNum].Text.Trim())) || (mergeMode == 3 && (gvr.Cells[cellNum].Text == gvrNext.Cells[cellNum].Text || " ".Equals(gvrNext.Cells[cellNum].Text.Trim())))))
{
gvrNext.Cells[cellNum].Visible = false;
rowSpanNum++;
//gvrNext.BackColor = gvr.BackColor;
if (alterColor == System.Drawing.Color.White)
gvrNext.BackColor = System.Drawing.Color.LightGray;
}
else
{
gvr.Cells[cellNum].RowSpan = rowSpanNum;
rowSpanNum = 1;
//間隔行加底色，便於閱讀
if (mergeKey.HasValue && cellNum == mergeKey.Value)
{
if (alterColor == System.Drawing.Color.White)
{
gvr.BackColor = System.Drawing.Color.LightGray;
alterColor = System.Drawing.Color.LightGray;
}
else
{
alterColor = System.Drawing.Color.White;
}
}
break;
}
if (i == gvExport.Rows.Count - 1)
{
gvr.Cells[cellNum].RowSpan = rowSpanNum;
if (mergeKey.HasValue && cellNum == mergeKey.Value)
{
if (alterColor == System.Drawing.Color.White)
gvr.BackColor = System.Drawing.Color.LightGray;
}
}
}
}
}
/// <summary>
/// 另存爲2003格式Excel
/// </summary>
/// <param name="filePath"></param>
public static void SaveAsExcel2003(string filePath)
{
Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
app.DisplayAlerts = false; //取消所有提示窗口
Microsoft.Office.Interop.Excel.Workbooks wbs = app.Workbooks;
Microsoft.Office.Interop.Excel.Workbook wb = wbs.Open(filePath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
//另存爲Excel2003格式
wb.SaveAs(filePath, Microsoft.Office.Interop.Excel.XlFileFormat.xlExcel8, null, null, false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, null, null, null, null, null);
wb.Close(Type.Missing, Type.Missing, Type.Missing);
wbs.Close();
app.Quit();
wb = null;
wbs = null;
app = null;
GC.Collect();
}
}
}