C#中导出Excel的常用方式
ASP.NET项目中，常用来处理Excel导出功能的几个简单方法，仅供参考：
/*=============================================================
* Report Excel Helper
* Author ： Danny,Li
* E-mail ： [email protected]
* Edition： V-101014
*=============================================================*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Web;
namespace IRCommon
{
public class ExcelHelper
{
/// <summary>
/// 私有构造方法，不允许创建实例
/// </summary>
private ExcelHelper()
{
// TODO: Add constructor logic here
}
/// <summary>
/// DataTable To Excel (Encoding:GB2312)
/// </summary>
/// <param name="dtData">DataTable</param>
/// <param name="filename">Excel Name</param>
public static void DataTableToExcel(DataTable dtData, string filename)
{
System.Web.UI.WebControls.DataGrid dgExport = null;
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
System.IO.StringWriter strWriter = null;
System.Web.UI.HtmlTextWriter htmlWriter = null;
curContext.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.Write("<meta http-equiv=Content-Type content=text/html;charset=gb2312>");
curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
curContext.Response.Charset = "GB2312";
HttpContext.Current.Response.AppendHeader("content-disposition", "inline; filename=" + filename + ".xls");
HttpContext.Current.Response.Flush();
strWriter = new System.IO.StringWriter();
htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);
dgExport = new System.Web.UI.WebControls.DataGrid();
dgExport.DataSource = dtData;
dgExport.AllowPaging = false;
dgExport.DataBind();
dgExport.RenderControl(htmlWriter);
curContext.Response.Write(strWriter.ToString());
curContext.Response.End();
}
/// <summary>
/// DataTable To Excel (自定义Excel格式; Encoding:UTF-8)
/// </summary>
/// <param name="page">System.Web.UI.Page</param>
/// <param name="dtData">DataTable</param>
/// <param name="filename">Excel Name</param>
public static void DataTableToExcel(System.Web.UI.Page page, DataTable dtData, string filename)
{
page.Response.Clear();
page.Response.Buffer = true;
page.Response.Charset = "utf-8";
page.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
page.Response.AppendHeader("Content-Disposition", "Attachment;fileName=" + filename);
page.Response.ContentType = "application/vnd.ms-excel";
page.Response.Charset = "";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlTxtWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
htmlTxtWrite.Write("<html>\r\n<meta content=\"text/html;charset=utf-8\"></meta>\r\n<body>\r\n");
htmlTxtWrite.Write("<table cellspacing=\"0\" border=\"1\">\r\n");
htmlTxtWrite.Write("<tr>\r\n");
for (int i = 0; i < dtData.Columns.Count; i++)
{
string strTitle = ConvertToHtmlCode(dtData.Columns[i].Caption.Trim());
htmlTxtWrite.Write("\t<td bgcolor=\"lightblue\">" + strTitle + "</td>\r\n");
}
htmlTxtWrite.Write("</tr>\r\n");
foreach (DataRow dr in dtData.Rows)
{
htmlTxtWrite.Write("<tr>\r\n");
for (int i = 0; i < dtData.Columns.Count; i++)
{
string strValue = "";
if (dtData.Columns[i].DataType == typeof(System.DateTime))
strValue = DateTimeConvertToString(dr[i], false);
else
strValue = ConvertToHtmlCode(dr[i].ToString().Trim());
htmlTxtWrite.Write("\t<td>" + strValue + "</td>\r\n");
}
htmlTxtWrite.Write("</tr>\r\n");
}
htmlTxtWrite.Write("\r\n</table>\r\n</body>\r\n</html>");
page.Response.Write(stringWrite.ToString());
page.Response.End();
}
private static string ConvertToHtmlCode(string source)
{
string result = "";
result = source.Replace("<", "<");
result = result.Replace(">", ">");
result = result.Replace("\r\n", "<BR>");
result = result.Replace(" ", " ");
return result;
}
private static string DateTimeConvertToString(Object obj, bool bShow)
{
DateTime defaultDate = DateTime.Parse("1990-01-01");
DateTime dtDateTime = ConvertToDateTime(obj, defaultDate);
if (dtDateTime == defaultDate && bShow == false)
return "";
if (dtDateTime.Hour == 0 && dtDateTime.Minute == 0 && dtDateTime.Second == 0)
return dtDateTime.ToString("yyyy-MM-dd");
return dtDateTime.ToString("yyyy-MM-dd hh:mm:ss");
}
private static DateTime ConvertToDateTime(Object obj, DateTime dateDefault)
{
try
{
DateTime dateRet = DateTime.Parse(obj.ToString().Trim());
if ((dateRet > DateTime.Parse("1753-01-01 12:00:00")) && (dateRet < DateTime.Parse("9999-01-01 23:59:59")))
return dateRet;
}
catch
{
}
return dateDefault;
}
/// <summary>
/// DataGrid To Excel (Encoding:GB2312)
/// </summary>
/// <param name="dgData">DataGrid</param>
/// <param name="fileName">Excel Name</param>
public static void DataGridToExcel(System.Web.UI.WebControls.DataGrid dgData, string fileName)
{
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
curContext.Response.Clear();
fileName = HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8);
curContext.Response.AddHeader("content-disposition", "attachment;filename=" + fileName + ".xls");
curContext.Response.Charset = "GB2312";
curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
curContext.Response.Write("<meta http-equiv=Content-Type content=text/html;charset=gb2312>");
curContext.Response.Cache.SetCacheability(HttpCacheability.NoCache);
curContext.Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
dgData.RenderControl(htmlWrite);
curContext.Response.Write(stringWrite.ToString());
curContext.Response.End();
}
/// <summary>
/// GridView To Excel (需要重载VerifyRenderingInServerForm方法)
/// </summary>
/// <param name="gvList">GridView</param>
/// <param name="fileName">Excel Name</param>
public static void GridViewToExcel(System.Web.UI.WebControls.GridView gvList, string fileName)
{
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
curContext.Response.ClearContent();
curContext.Response.AddHeader("content-disposition", "attachment; filename=" + fileName + ".xls");
curContext.Response.ContentEncoding = System.Text.Encoding.Default;
System.IO.StringWriter sw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw);
gvList.RenderControl(htw);
curContext.Response.Write(sw.ToString());
curContext.Response.End();
}
#region GridView To Excel 必要的重载方法(.aspx.cs)
/*public override void VerifyRenderingInServerForm(System.Web.UI.Control control)
{
//GridView To Excel 必要的重载方法
}*/
#endregion
/// <summary>
/// 将Excel中的列以 文本的格式存储数字 (需要更改参数：第几列为要处理的列)
/// </summary>
/// <param name="dtData">DataTable</param>
/// <param name="filename">Excel Name</param>
public static void DataTableToExcelAsText(DataTable dtData, string filename)
{
System.Web.UI.WebControls.DataGrid dgExport = null;
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
System.IO.StringWriter strWriter = null;
System.Web.UI.HtmlTextWriter htmlWriter = null;
//Response.ContentType指定文件类型 可以为application/ms-excel、application/ms-word、application/ms-txt、application/ms-html
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
curContext.Response.Charset = "GB2312";
//下面这行很重要， attachment 参数表示作为附件下载，您可以改成 online在线打开
//filename=FileFlow.xls 指定输出文件的名称，注意其扩展名和指定文件类型相符，可以为：.doc .xls .txt .htm
curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
// 导出excel文件
strWriter = new System.IO.StringWriter();
htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);
// 为了解决dgData中可能进行了分页的情况，需要重新定义一个无分页的DataGrid
dgExport = new System.Web.UI.WebControls.DataGrid();
dgExport.DataSource = dtData.DefaultView;
dgExport.AllowPaging = false;
//身份证号的处理的关键在此事件(以文本的形式存储数字)
dgExport.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(gridHrInfo_ItemDataBound1);
dgExport.DataBind();
// 返回客户端
dgExport.RenderControl(htmlWriter);
curContext.Response.Write(strWriter.ToString());
//curContext.flush();
curContext.Response.End();
}
protected static void gridHrInfo_ItemDataBound1(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
//此事件为处理以 文本形式存储数字 此事件在datagrid绑定时
if (e.Item.ItemType == System.Web.UI.WebControls.ListItemType.Item || e.Item.ItemType == System.Web.UI.WebControls.ListItemType.AlternatingItem)
{
//cells[n]是指表中要进行理的数据列（第n列为身份证列,下标从0开始）
e.Item.Cells[3].Attributes.Add("style", "vnd.ms-excel.numberformat:@");
/*
下面就列出常用的一些格式：
1） 文本：vnd.ms-excel.numberformat:@
2） 日期：vnd.ms-excel.numberformat:yyyy/mm/dd
3） 数字：vnd.ms-excel.numberformat:#,##0.00
4） 货币：vnd.ms-excel.numberformat:￥#,##0.00
5） 百分比：vnd.ms-excel.numberformat: #0.00%
*/
}
}
/// <summary>
/// 将 Excel 文件中指定 Sheet 的数据导入到 DataSet 中
/// </summary>
/// <param name="strPath">Excel Path (Excel 8.0 2003)</param>
/// <param name="strSheetName">Excel Sheet Name</param>
/// <returns></returns>
public static DataSet ExcelToDataSet(string strPath, string strSheetName)
{
DataSet ds = null;
try
{
string strConn = "Provider = Microsoft.Jet.OLEDB.4.0; Data Source = " + strPath + "; Extended Properties = Excel 8.0";
System.Data.OleDb.OleDbConnection oconn = new System.Data.OleDb.OleDbConnection(strConn);
oconn.Open();
string strSql = "SELECT * FROM [" + strSheetName + "$]";
System.Data.OleDb.OleDbDataAdapter oda = new System.Data.OleDb.OleDbDataAdapter(strSql, oconn);
ds = new DataSet();
oda.Fill(ds);
}
catch
{
}
return ds;
}
}
}