Gridview导出到EXCEL

为避免出错的准备

出错1:类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
解决方案:在后台文件中重载VerifyRenderingInServerForm方法,如:
public override void VerifyRenderingInServerForm(Control control)
{
}

出错2:只能在执行 Render() 的过程中调用 RegisterForEventValidation(RegisterForEventValidation can only be called during Render();

解决方案:在源中,添加红色部分<%@ Page Language="C#" EnableEventValidation = "false"CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>

另外,在使用时,把GRIDVIEW获取数据的方法getdata()写成public DataSet  getdata(),return 一个DS,

调用事件里,实例化一个DATASET, 让它值等于DS,

例:事件{ DataSet  ds = getdata();   
        CreateExcel(ds , "aa.xls");} 或者把数据绑定与获取DATASET分开

 方法1简单：

 public void ToExcel()//整个GRIDVIEW导出到EXCEL
    {
        string filename="网银终端" + DateTime.Now.ToString("yyyyMMdd") + ".xls";
        string style = @"<style> .text { mso-number-format:\@; } </script> "; //解决第一位字符为零时不显示的问题
       
        this.GridView1.AllowPaging = false;
        this.GridView1.DataBind();

        filename = HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8);//解决导出EXCEL时乱码的问题
        Response.ClearContent;
       
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        Response.ContentType = "application/excel";
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename);

        System.IO.StringWriter sw = new System.IO.StringWriter();//定义一个字符串写入对象
        HtmlTextWriter htw = new HtmlTextWriter(sw);//将html写到服务器控件输出流
       
        this.GridView1.RenderControl(htw);//将控件GRIDVIEW中的内容输出到HTW中
        Response.Write(style);
        Response.Write(sw);
        Response.End();

        this.GridView1.AllowPaging = true;
    }

方法2:粘帖直接用

public void CreateExcel(DataSet ds, string FileName)//整个GRIDVIEW导出到EXCEL.xls
    {
        FileName=HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);//解决导出时文件名汉字显示乱码的问题

        HttpResponse resp;
        resp = Page.Response;
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
        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
        DataTable dt = ds.Tables[0];
        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);
        //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";
                }

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

        }
        resp.End();
    }