将gridview 的数据导出EXCEL

gridview数据

 

单击“导出EXCEL”按钮后 

 

 

     1.在上面的代码中，先将gridview绑定到指定的数据源中，然后在button按钮（用来做导出到EXCEL的）的事件中，写入相关的代码。

     2.使用Response.AddHeader("content-disposition","attachment;filename= exporttoexcel.xls");中的filename来指定将要导出的excel的文件名，

     3.这里是exporttoexcel.xls。要注意的是，由于gridview的内容可能是分页显示的，因此，这里在每次导出excel时，先将gridview的allowpaging属性设置为 false,

    4. 然后通过页面流的方式导出当前页的gridview到excel中，最后再重新设置其allowpaging属性。另外要注意的是，要写一个空的VerifyRenderingInServerForm方法（必须写），

    

     /// <summary>
    /// 导EXCEL
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnExcel_Click(object sender, EventArgs e)
    {
        Response.Clear();
        Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
        Response.Charset = "gb2312";
        Response.ContentType = "application/vnd.xls";
        System.IO.StringWriter stringWrite = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

        gvValueList.AllowPaging = false;
        fun.GvDataInit(sql.selEntryTable, gvValueList, ddlMonth.SelectedValue.Trim());//绑定GV
        gvValueList.RenderControl(htmlWrite);

        Response.Write(stringWrite.ToString());
        Response.End();
        gvValueList.AllowPaging = true;
        fun.GvDataInit(sql.selEntryTable, gvValueList, ddlMonth.SelectedValue.Trim());//绑定GV
    }

    /// <summary>
    /// 导出EXCEL，要写一个空的VerifyRenderingInServerForm方法
    /// </summary>
    /// <param name="control"></param>
    public override void VerifyRenderingInServerForm(Control control)
    {
        // Confirms that an HtmlForm control is rendered for
    }


        /// <summary>
        ///  绑定GridView数据
        /// </summary>
        /// <param name="sqlID"></param>
        /// <param name="gv"></param>
        public void GvDataInit(string sqlID, GridView gv, string Condition1)
        {
            try
            {
                DataTable dt = null;

                dt = BLL.SQLHandler.SearchData(sqlID, Condition1);

                if (dt != null && dt.Rows.Count > 0)
                {
                    gv.DataSource = dt;
                }
                else
                {
                    gv.PageIndex = 0;
                }

                gv.DataBind();


            }
            catch (Exception ex)
            {
                gv.PageIndex = 0;
                throw ex;

            }
        }

 若报错提示如下：

 报RegisterForEventValidation can only be called during Render()错误 .

将

<%@ Page Language="C#"   AutoEventWireup="true" CodeFile="AddEntrytable.aspx.cs" Inherits="AddEntrytable" %>
修改为

 <%@ Page Language="C#"   EnableEventValidation="false"  AutoEventWireup="true" CodeFile="AddEntrytable.aspx.cs" Inherits="AddEntrytable" %>

方二：

protected void btnExcel_Click(object sender, EventArgs e)
    {
        gvValueList.AllowPaging = false;
        databind();


        ToExcel(this.gvValueList, System.Web.HttpUtility.UrlEncode("test.xls", System.Text.Encoding.UTF8));
        //Response.Clear();
        //Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
        //Response.Charset = "gb2312";
        //Response.ContentType = "application/vnd.xls";
        //System.IO.StringWriter stringWrite = new System.IO.StringWriter();
        //System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);

        //gvValueList.AllowPaging = false;
        //databind();
        //gvValueList.RenderControl(htmlWrite);

        //Response.Write(stringWrite.ToString());
        //Response.End();
        //gvValueList.AllowPaging = true;
        //databind();
    }
    private void ToExcel(Control ctl, string FileName)
    {
        HttpContext.Current.Response.Charset = "UTF-8";
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
        HttpContext.Current.Response.ContentType = "application/ms-excel";
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + "" + FileName);
        ctl.Page.EnableViewState = false;
        System.IO.StringWriter tw = new System.IO.StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        ctl.RenderControl(hw);
        HttpContext.Current.Response.Write(tw.ToString());
        HttpContext.Current.Response.End();
    }

    public override void VerifyRenderingInServerForm(Control control)
    {
        // Confirms that an HtmlForm control is rendered for
    }