將GridView中不可見的列導出到Excel中

我在ASP.Net網頁（.Net 4.0，C＃）中有一個GridView，它有一些不可見的列。但是，用戶希望這些列在Excel導出中顯示。我很難理解如何做到這一點。我試着讓列既是BoundField之一，在它與標籤的TemplateField：將GridView中不可見的列導出到Excel中

<asp:TemplateField HeaderText="Device Comments" SortExpression="DeviceComments" Visible="false"> 
       <ItemTemplate> 
        <asp:Label runat="server" Text='<%# Eval("DeviceComments") %>' ID="lbDeviceComments" /> 
       </ItemTemplate> 
      </asp:TemplateField> 
      <asp:BoundField DataField="DeviceComments" HeaderText="Device Comments" SortExpression="DeviceComments" Visible="false" />

列沒有在網頁上顯示出來，符合市場預期。但是，當我嘗試在導出到Excel的方法中使列可見時，它們保持不可見狀態。我試過了：

protected void Export2Excel(object sender, EventArgs e) 
     { 
      Response.ClearContent(); 
      Response.AppendHeader("content-disposition", "attachment; filename=Mobile.xls"); 
      Response.ContentType = "application/excel"; 

      StringWriter stringWriter = new StringWriter(); 
      HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter); 

      GridView currentGridView = new GridView(); 
      switch (DeviceType()) 
      { 
       case "cell": 
        currentGridView = gvCellResults; 
        break; 
       case "loaner": 
        currentGridView = gvCellResults; 
        break; 
       case "wireless": 
        currentGridView = gvCellResults; 
        break; 
       case "smartphone": 
        currentGridView = gvSmartPhoneResults; 
        break; 
      } 

      foreach (GridViewRow gridViewRow in currentGridView.Rows) 
      { 
       gridViewRow.ForeColor = Color.Black; 
       HyperLink phonenumber = new HyperLink(); 
       HyperLink imei = new HyperLink(); 
       HyperLink employee = new HyperLink(); 
       foreach (TableCell gridViewRowTableCell in gridViewRow.Cells) 
       { 
        phonenumber = (HyperLink)gridViewRowTableCell.FindControl("hrefPhoneNumber"); 
        imei = (HyperLink)gridViewRow.Cells[1].FindControl("hrefIMEI"); 
        employee = (HyperLink)gridViewRow.Cells[6].FindControl("hrefEmpName"); 
        gridViewRowTableCell.Style["forecolor"] = "#000000"; 
       } 
       gridViewRow.Cells[11].Visible = true; 
       gridViewRow.Cells[11].Style["display"] = "inline"; 
       if (gridViewRow.RowType == DataControlRowType.DataRow) 
       { 
        for (int columnIndex = 0; columnIndex < gridViewRow.Cells.Count; columnIndex++) 
        { 
         gridViewRow.Cells[columnIndex].Attributes.Add("class", "text"); 
         gridViewRow.Cells[columnIndex].Text = gridViewRow.Cells[columnIndex].Text.StripTags(); 
        } 

        if (phonenumber != null) 
         gridViewRow.Cells[0].Text = phonenumber.Text; 
        if (imei != null) 
         gridViewRow.Cells[1].Text = imei.Text; 
        if (employee != null) 
         gridViewRow.Cells[6].Text = employee.Text; 
       } 
      } 

      currentGridView.RenderControl(htmlTextWriter); 
      string style = @"<style> .text { mso-number-format:\@; } </style> "; 
      Response.Write(style); 
      Response.Write(stringWriter.ToString()); 
      Response.End(); 
     }

但是該列沒有出現在Excel中。我確定我正在處理右列，因爲我已經通過調試器運行它並檢查了單元格的Text屬性;它們與該列的網頁上顯示的內容相匹配。奇怪的是，在調試器中，即使在我將其更改爲true之前，單元格的Visible屬性也顯示爲true。我究竟做錯了什麼？

來源

2014-04-28 Melanie

您沒有提供任何解釋，你如何導出到Excel。這個答案依賴於此，請通過更新問題來提供相應的代碼。您也可以考慮大部分時間應該直接導出基礎數據，而不是導出GridView。 – mason

顯示您用於導出爲excel的代碼。我這樣做沒有問題。你應該真的在設置列（不是單元格）來顯示。我再猜，取決於你的代碼你如何使它可見或不可見 –

代碼對整個出口的方法已被添加。 – Melanie

我確定您正在加載數據以在頁面加載或單擊按鈕事件時顯示在GridView上。我建議將這些數據保存在緩存或內存中，然後使用像EPPlus這樣的庫來生成具有所需格式的Excel文件。 Here是顯示如何使用EPPlus的文章。

Here是關於SO的另一個問題，它討論瞭如何使用ashx處理程序創建一個有用的Excel文件。

來源

2014-04-28 19:42:35

在我調用Response.ClearContent();之前，試着讓列可見。

喜歡的東西

protected void Export2Excel(object sender, EventArgs e) 
    { 
     gridViewRow.Cells[11].Visible = true; 
     gridViewRow.Cells[11].Style["display"] = "inline"; 
     Response.ClearContent(); 
     Response.AppendHeader("content-disposition", "attachment; filename=Mobile.xls"); 
     Response.ContentType = "application/excel"; 

     StringWriter stringWriter = new StringWriter(); 
     HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter); 

     GridView currentGridView = new GridView(); 
     switch (DeviceType()) 
     { 
      case "cell": 
       currentGridView = gvCellResults; 
       break; 
      case "loaner": 
       currentGridView = gvCellResults; 
       break; 
      case "wireless": 
       currentGridView = gvCellResults; 
       break; 
      case "smartphone": 
       currentGridView = gvSmartPhoneResults; 
       break; 
     } 

     foreach (GridViewRow gridViewRow in currentGridView.Rows) 
     { 
      gridViewRow.ForeColor = Color.Black; 
      HyperLink phonenumber = new HyperLink(); 
      HyperLink imei = new HyperLink(); 
      HyperLink employee = new HyperLink(); 
      foreach (TableCell gridViewRowTableCell in gridViewRow.Cells) 
      { 
       phonenumber = (HyperLink)gridViewRowTableCell.FindControl("hrefPhoneNumber"); 
       imei = (HyperLink)gridViewRow.Cells[1].FindControl("hrefIMEI"); 
       employee = (HyperLink)gridViewRow.Cells[6].FindControl("hrefEmpName"); 
       gridViewRowTableCell.Style["forecolor"] = "#000000"; 
      } 

      if (gridViewRow.RowType == DataControlRowType.DataRow) 
      { 
       for (int columnIndex = 0; columnIndex < gridViewRow.Cells.Count; columnIndex++) 
       { 
        gridViewRow.Cells[columnIndex].Attributes.Add("class", "text"); 
        gridViewRow.Cells[columnIndex].Text = gridViewRow.Cells[columnIndex].Text.StripTags(); 
       } 

       if (phonenumber != null) 
        gridViewRow.Cells[0].Text = phonenumber.Text; 
       if (imei != null) 
        gridViewRow.Cells[1].Text = imei.Text; 
       if (employee != null) 
        gridViewRow.Cells[6].Text = employee.Text; 
      } 
     } 

     currentGridView.RenderControl(htmlTextWriter); 
     string style = @"<style> .text { mso-number-format:\@; } </style> "; 
     Response.Write(style); 
     Response.Write(stringWriter.ToString()); 
     Response.End(); 
    }

來源

2016-06-02 14:14:25

將GridView中不可見的列導出到Excel中

回答

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