asp.net 导出数据到Excle

public class PrinExcel
{
    public PrinExcel()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    public static void ToExcel(System.Web.UI.Control ctl, string strFileName)
    {
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + strFileName + ".xls");
        HttpContext.Current.Response.Charset = "utf-8";

        string style = @"<style> .text { } </script> "; //Excel中的文本格式

        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        //System.Text.Encoding.Default;      

        HttpContext.Current.Response.ContentType = "application/ms-excel";     //设置输出流为简体中文      
        ctl.Page.EnableViewState = false;
        System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);

        ctl.RenderControl(hw);
        HttpContext.Current.Response.Write(style);
        HttpContext.Current.Response.Write(tw.ToString());
        HttpContext.Current.Response.End();
        hw.Flush();
        hw.Close();
        tw.Flush();
        tw.Close();

    }
    //导出到Excel
    public static void ToExcel2(System.Web.UI.Control ctl, string strFileName)
    {
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + strFileName + ".xls");
        HttpContext.Current.Response.Charset = "GB2312"; //"utf-8"; 

        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        //System.Text.Encoding.Default;      

        HttpContext.Current.Response.ContentType = "application/ms-excel";     //设置输出流为简体中文      
        ctl.Page.EnableViewState = false;
        System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);

        ctl.RenderControl(hw);
        HttpContext.Current.Response.Write(tw.ToString());
        HttpContext.Current.Response.End();
        hw.Flush();
        hw.Close();
        tw.Flush();
        tw.Close();

    }
    //导出到Excel  
    public static void ToExcel(DataTable dt)
    {
        string sb = "";

        foreach (DataRow dr in dt.Rows)
        {
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                sb = sb + dr[i].ToString() + "\t";
            }
            sb = sb + "\n";
        }

        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=myexcel.xls");
        HttpContext.Current.Response.Charset = "UTF-8";
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;
        HttpContext.Current.Response.ContentType = "application/ms-excel";

        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
        hw.WriteLine(sb.ToString());
        HttpContext.Current.Response.Write(tw.ToString());

        HttpContext.Current.Response.End();

        hw.Flush();
        hw.Close();
        tw.Flush();
        tw.Close();
    }

    //导出到Excel
    public static void ToExcel(string sb)
    {
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "inline;filename=myexcel.xls");
        HttpContext.Current.Response.Charset = "UTF-8";
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;
        HttpContext.Current.Response.ContentType = "application/ms-excel";

        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
        hw.WriteLine(sb.ToString());
        HttpContext.Current.Response.Write(tw.ToString());

        HttpContext.Current.Response.End();

        hw.Flush();
        hw.Close();
        tw.Flush();
        tw.Close();
    }