不生成Excel文件，将Datatable数据 Response.write 输出生成Excel (转载)

不生成Excel文件，将Datatable数据 Response.write 输出生成Excel

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;

namespace ExeclSaveAS
{
public partial class _Default : System.Web.UI.Page
{
//可以输出到Excel，并显示正确。但是会有错误提示信息。不知哪位高手有无办法解决？
protected void Page_Load(object sender, EventArgs e)
{
//ShowExecl();//提示三次

DataTable1Excel();//只提示一次
}

private void ShowExecl()
{
DataTable dt = GetDataSource();
Response.Charset = "UTF-8";
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AppendHeader("Content-Disposition", "attachment;filename=ccc_mys.xls");
Response.ContentType = "application/ms-excel";
string colHeaders = "", ls_item = "";
//定义表对象与行对象，同时用DataSet对其值进行初始化
DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的
int i = 0;
int cl = dt.Columns.Count;

//取得数据表各列标题，各标题之间以t分割，最后一个列标题后加回车符
for (i = 0; i < cl; i++)
{
if (i == (cl - 1))//最后一列，加n
{
colHeaders += dt.Columns[i].Caption.ToString() + "\n";
}
else
{
colHeaders += dt.Columns[i].Caption.ToString() + "\t";
}

}
// resp.Write(colHeaders);
Response.Write(colHeaders);
//向HTTP输出流中写入取得的数据信息

//逐行处理数据
foreach (DataRow row in myRow)
{
//当前行数据写入HTTP输出流，并且置空ls_item以便下行数据
for (i = 0; i < cl; i++)
{
if (i == (cl - 1))//最后一列，加n
{
ls_item += row[i].ToString() + "\n";
}
else
{
ls_item += row[i].ToString() + "\t";
}

}
Response.Write(ls_item);
ls_item = "";

}
Response.Flush();
Response.End();
}

/// <summary>
/// 数据源（这里给的数据源是一个Datatable ）
/// </summary>
/// <returns></returns>
private DataTable GetDataSource()
{
DataTable newdata = new DataTable();
newdata.Columns.Add("ID");
newdata.Columns.Add("Name");

object [] OneRowValue=new object []{"1","AAAA"};
object[] TwoRowValue = new object[] { "2", "BBBBB" };

newdata.Rows.Add(OneRowValue);
newdata.Rows.Add(TwoRowValue);

return newdata;
}

/// <summary>
/// 只提示一次
/// </summary>
public void DataTable1Excel()
{
DataTable dtData = GetDataSource();

System.Web.UI.WebControls.GridView gvExport = null;

// 当前对话
System.Web.HttpContext curContext = System.Web.HttpContext.Current;

// IO用于导出并返回excel文件
System.IO.StringWriter strWriter = null;
System.Web.UI.HtmlTextWriter htmlWriter = null;

if (dtData != null)
{
// 设置编码和附件格式
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
curContext.Response.Charset = "utf-8";

// 导出excel文件
strWriter = new System.IO.StringWriter();
htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);
// 为了解决gvData中可能进行了分页的情况，需要重新定义一个无分页的GridView
gvExport = new System.Web.UI.WebControls.GridView();

gvExport.DataSource = dtData.DefaultView;
gvExport.AllowPaging = true;
gvExport.DataBind();

// 返回客户端
gvExport.RenderControl(htmlWriter);
curContext.Response.Write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />" + strWriter.ToString());
curContext.Response.End();
}
}
}

}