将网格视图数据导出为pdf

Question

我收到错误：类型'GridView'的控件'MainContent_dgvRpt'必须放置在runat = server的窗体标记中。

ASP代码：

<asp:GridView ID="dgvRpt" runat="server" Width="900px" CssClass="Grid" OnRowDataBound="dgvShowRpt_RowDataBound"> 
<RowStyle HorizontalAlign="Left" /> 
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="black" Font-Names="Arial" /> 
<PagerStyle BackColor="#CDCDCD" ForeColor="White" HorizontalAlign="Center" Font-Names="Arial" /> 
<HeaderStyle BackColor="#CDCDCD" Font-Bold="True" ForeColor="black" Font-Names="Arial" /> 

<HeaderStyle CssClass="GridHeader" Font-Names="Arial"></HeaderStyle> 
<AlternatingRowStyle CssClass="GridAtlItem" /> 
</asp:GridView>. 

C＃代码：

GameLib.Utilities.ExportGrid(dgvRpt, "pdf", GameLib.Reports.ReportName); 

    if (ExportType == "pdf") 
       { 
        HttpContext.Current.Response.Clear(); 
        HttpContext.Current.Response.Buffer = true; 
        HttpContext.Current.Response.ContentType = "application/pdf"; 
        HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + Filename + ".pdf"); 

        HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache); 
        StringWriter sw = new StringWriter(); 
        HtmlTextWriter hw = new HtmlTextWriter(sw); 


        gv.AllowPaging = false; 
        gv.HeaderRow.ForeColor = System.Drawing.Color.Black; 
        gv.FooterRow.ForeColor = System.Drawing.Color.Black; 

        gv.HeaderRow.Style.Add("font-Color", "Black"); 
        gv.HeaderRow.Style.Add("font-size", "13px"); 
        gv.HeaderRow.Style.Add("text-decoration", "none"); 
        gv.HeaderRow.Style.Add("font-family", "Arial, Helvetica, sans-serif;"); 

        gv.Style.Add("font-Color", "Black"); 
        gv.Style.Add("text-decoration", "none"); 
        gv.Style.Add("font-family", "Arial, Helvetica, sans-serif;"); 
        gv.Style.Add("font-size", "11px"); 
        gv.ForeColor = System.Drawing.Color.Black; 

        gv.RenderControl(hw); 
        StringReader sr = new StringReader(sw.ToString()); 
        Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f); 

        HTMLWorker htmlparser = new HTMLWorker(pdfDoc); 
        PdfWriter.GetInstance(pdfDoc, HttpContext.Current.Response.OutputStream); 
        pdfDoc.Open(); 

        htmlparser.Parse(sr); 
        pdfDoc.Close(); 
        HttpContext.Current.Response.Write(pdfDoc); 
        HttpContext.Current.ApplicationInstance.CompleteRequest(); 

得到错误在gv.RenderControl（HW）;但我在runat = server中插入代码。请帮助我对问题进行排序。

Answer 1

你可以使用这个：修改前面的代码。

protected void ExportToPdf(DataTable dt) 
      { 
       GridView GridView1 = new GridView(); 
       GridView1.ShowHeaderWhenEmpty = true; 
       GridView1.AllowPaging = false; 
       GridView1.DataSource = dt; 
       GridView1.DataBind(); 
       HttpContext.Current.Response.Clear(); 
       HttpContext.Current.Response.Buffer = true; 
       HttpContext.Current.Response.ContentType = "application/pdf"; 
       HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + "ggggggggg" + ".pdf"); 

       HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache); 
       StringWriter sw = new StringWriter(); 
       HtmlTextWriter hw = new HtmlTextWriter(sw); 


       GridView1.AllowPaging = false; 
       GridView1.HeaderRow.ForeColor = System.Drawing.Color.Black; 
       GridView1.FooterRow.ForeColor = System.Drawing.Color.Black; 

       GridView1.HeaderRow.Style.Add("font-Color", "Black"); 
       GridView1.HeaderRow.Style.Add("font-size", "13px"); 
       GridView1.HeaderRow.Style.Add("text-decoration", "none"); 
       GridView1.HeaderRow.Style.Add("font-family", "Arial, Helvetica, sans-serif;"); 

       GridView1.Style.Add("font-Color", "Black"); 
       GridView1.Style.Add("text-decoration", "none"); 
       GridView1.Style.Add("font-family", "Arial, Helvetica, sans-serif;"); 
       GridView1.Style.Add("font-size", "11px"); 
       GridView1.ForeColor = System.Drawing.Color.Black; 

       GridView1.RenderControl(hw); 
       StringReader sr = new StringReader(sw.ToString()); 
       Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f); 

       HTMLWorker htmlparser = new HTMLWorker(pdfDoc); 
       PdfWriter.GetInstance(pdfDoc, HttpContext.Current.Response.OutputStream); 
       pdfDoc.Open(); 

       htmlparser.Parse(sr); 
       pdfDoc.Close(); 
       HttpContext.Current.Response.Write(pdfDoc); 
       HttpContext.Current.ApplicationInstance.CompleteRequest(); 
      } 

Answer 2

您必须告诉编译器，通过重写VerifyRenderingInServerForm事件来明确呈现控件。 像：

public override void VerifyRenderingInServerForm(Control control) 
    { 
     // 
    } 

http://www.codeproject.com/Questions/381483/Control-GridView1-of-type-GridView-must-be-placed

Answer 3

我有相同的逻辑来一个GridView导出到Excel，但在GridView只存在于后台代码。这里是我的代码：

protected void ExportToExcel(DataTable dt) 
     { 
      //Create a dummy GridView 
      GridView GridView1 = new GridView(); 
      GridView1.ShowHeaderWhenEmpty = true; 
      GridView1.AllowPaging = false; 
      GridView1.DataSource = dt; 
      GridView1.DataBind();    

      HttpContext.Current.Response.Clear(); 
      HttpContext.Current.Response.Buffer = true; 

      StringWriter sw = new StringWriter(); 
      HtmlTextWriter hw = new HtmlTextWriter(sw); 

      List<int> decimalModeColumnsIndexes = new List<int>(); 

      // Set the column's header with the caption of the Column in the DataTable 
      for (int i = 0; i < dt.Columns.Count; i++) 
      { 
       GridView1.HeaderRow.Cells[i].Text = dt.Columns[i].Caption;     
      } 

      for (int i = 0; i < GridView1.Rows.Count; i++) 
      { 
       //Apply text style to each cell 
       if (decimalModeColumnsIndexes.Count != 0) 
       { 
        for (int j = 0; j < GridView1.Rows[i].Cells.Count; j++) 
        { 
         if (decimalModeColumnsIndexes.Count(colIndex => colIndex == j) == 1) 
         { 
          GridView1.Rows[i].Cells[j].Attributes.Add("class", "decimalmode"); 
         } 
         else 
         { 
          GridView1.Rows[i].Cells[j].Attributes.Add("class", "textmode"); 
         } 
        } 
       } 
       else 
       { 
        GridView1.Rows[i].Attributes.Add("class", "textmode"); 
       } 

      } 

      String fileName = dt.TableName; 
      fileName = String.Format("{0}_{1}", fileName, DateTime.UtcNow); 

      fileName = fileName.Replace(':', '-'); 
      fileName = fileName.Replace(' ', '-'); 


      GridView1.RenderControl(hw); 
      //style to format numbers to string 
      string style = @"<style> .textmode { mso-number-format:\@; } .decimalmode { mso-number-format:""0\.00""; } </style>"; 


      HttpContext.Current.Response.AddHeader("content-disposition", String.Format("attachment;filename={0}.xls", fileName)); 
      HttpContext.Current.Response.Charset = ""; 
      HttpContext.Current.Response.ContentType = "application/vnd.ms-excel"; 
      HttpContext.Current.Response.Write(style); 
      HttpContext.Current.Response.Output.Write(sw.ToString()); 
      HttpContext.Current.Response.Flush(); 
      HttpContext.Current.Response.End(); 

     }