類型“GridView”的控制項“ctl00_center_GridView1”必須放在具有 runat=server 的表單標記內。 說明: 執行當前 Web 請求期間，出現未處理的異常。請檢查堆疊追蹤資訊，以瞭解有關該錯誤以及代碼中導致錯誤的出處的詳細資料。 異常詳細資料:System.Web.HttpException: 類型“GridView”的控制項“ctl00_center_GridView1”必須放在具有 runat=server 的表單標記內。
雖然這個方法裡的內容也被注釋了，也就是說這是個空方法，但是如果沒有個方法，程式就會報上面那個錯誤。最初見到這段錯誤說明是想到了以前做ajax程式時報的一個錯誤很是類似。同樣是因為沒有重寫VerifyRenderingInServerForm方法所致。在此提醒使用的朋友注意，下面貼出匯出到Excel的代碼
usingSystem;
usingSystem.Data;
usingSystem.Configuration;
usingSystem.Collections;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Web.UI.HtmlControls;
usingSystem.IO;
///<summary>
///ToExcleHelper的摘要說明
///</summary>
publicclassExportHelper
{
publicstaticvoidExportToExcel(IListdataList,string[]fields,string[]headTexts,stringtitle)
{
GridViewgvw=newGridView();
intColCount,i;
//如果篩選的欄位和對應的列頭名稱個數相對的情況下只匯出指定的欄位
if(fields.Length!=0&&fields.Length==headTexts.Length)
{
ColCount=fields.Length;
gvw.AutoGenerateColumns=false;
for(i=0;i<ColCount;i++)
{
BoundFieldbf=newBoundField();
bf.DataField=fields[i];
bf.HeaderText=headTexts[i];
gvw.Columns.Add(bf);
}
}
else
{
gvw.AutoGenerateColumns=true;
}
SetStype(gvw);
gvw.DataSource=dataList;
gvw.DataBind();
ExportToExcel(gvw,title);
}
///<summary>
///匯出資料到Excel
///</summary>
///<paramname="DataList">IListData</param>
///<paramname="Fields">要匯出的欄位</param>
///<paramname="HeadName">欄位對應顯示的名稱</param>
publicstaticvoidExportToExcel(IListdataList,string[]fields,string[]headTexts)
{
ExportToExcel(dataList,fields,headTexts,string.Empty);
}
///<summary>
///設定樣式
///</summary>
///<paramname="gvw"></param>
privatestaticvoidSetStype(GridViewgvw)
{
gvw.Font.Name="Verdana";
gvw.BorderStyle=System.Web.UI.WebControls.BorderStyle.Solid;
gvw.HeaderStyle.BackColor=System.Drawing.Color.LightCyan;
gvw.HeaderStyle.ForeColor=System.Drawing.Color.Black;
gvw.HeaderStyle.HorizontalAlign=System.Web.UI.WebControls.HorizontalAlign.Center;
gvw.HeaderStyle.Wrap=false;
gvw.HeaderStyle.Font.Bold=true;
gvw.HeaderStyle.Font.Size=10;
gvw.RowStyle.Font.Size=10;
}
///<summary>
///匯出GridView中的資料到Excel
///</summary>
///<paramname="gvw"></param>
///<paramname="DataList"></param>
publicstaticvoidExportToExcel(GridViewgvw,stringtitle)
{
stringfileName;
HttpContext.Current.Response.Buffer=true;
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ClearHeaders();
fileName=string.Format("xhmd{0:yyMMddHHmm}.xls",DateTime.Now);
HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename="+fileName);
HttpContext.Current.Response.ContentType="application/vnd.ms-excel";
StringWritertw=newSystem.IO.StringWriter();
HtmlTextWriterhw=newSystem.Web.UI.HtmlTextWriter(tw);
gvw.RenderControl(hw);
if(!string.IsNullOrEmpty(title))
{
HttpContext.Current.Response.Write("<b><center><fontsize=3face=Verdanacolor=#0000FF>"+title+"</font></center></b>");
}
HttpContext.Current.Response.Write(tw.ToString());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.Close();
HttpContext.Current.Response.End();
gvw.Dispose();
tw.Dispose();
hw.Dispose();
gvw=null;
tw=null;
hw=null;
}
publicstaticvoidDataTable2Excel(System.Data.DataTabledtData)
{
System.Web.UI.WebControls.DataGriddgExport=null;
//目前的交談
System.Web.HttpContextcurContext=System.Web.HttpContext.Current;
//IO用於匯出並返回excel檔案
System.IO.StringWriterstrWriter=null;
System.Web.UI.HtmlTextWriterhtmlWriter=null;
if(dtData!=null)
{
//設定編碼和附件格式
curContext.Response.ContentType="application/vnd.ms-excel";
curContext.Response.ContentEncoding=System.Text.Encoding.UTF8;
curContext.Response.Charset="";
//匯出excel檔案
strWriter=newSystem.IO.StringWriter();
htmlWriter=newSystem.Web.UI.HtmlTextWriter(strWriter);
//為瞭解決dgData中可能進行了分頁的情況，需要重新定義一個無分頁的DataGrid
dgExport=newSystem.Web.UI.WebControls.DataGrid();
dgExport.DataSource=dtData.DefaultView;
dgExport.AllowPaging=false;
dgExport.DataBind();
//返回用戶端
dgExport.RenderControl(htmlWriter);
curContext.Response.Write(strWriter.ToString());
curContext.Response.End();
}
}
}
