Question

我有一个显示GridView的Aspx页面。 gridview将显示数据，该数据取决于从下拉菜单中选择的catergory。用户可以选择将其作为CSV文件下载（导出为CSV）。我现在想要不显示Gridview（因为它太大而常常只是挂起）而是能够从gridview下载带有数据的CSV文件。我已经成功构建了按钮，允许通过单击按钮下载此数据。但是，我现在无法在没有gridView出现的情况下打开页面。我试图注释掉Gridview代码 - 这只是打破了页面。我试图将gridview设置为Visible =“False”，但这也不起作用。我还能做些什么来防止出现gridview并将用户直接带到下载对话框？

Answer 1

您可以从Code Behind在DataSet或DataTable中加载数据，然后将其直接导出到Excel / CSV，而不将其分配给GridView，例如在以下示例中将其导出到Excel：

Public Sub ExportToExcel(dt As DataTable)
    If dt.Rows.Count > 0 Then
        Dim tw As New System.IO.StringWriter()
        Dim hw As New System.Web.UI.HtmlTextWriter(tw)
        Dim dgGrid As New DataGrid()
        dgGrid.DataSource = dt
        dgGrid.DataBind()
        'Get the HTML for the control.
        dgGrid.RenderControl(hw)
        'Write the HTML back to the browser.
        Response.ContentType = "application/vnd.ms-excel"
        Response.AppendHeader("Content-Disposition", "attachment; filename=Data.xls")
        Me.EnableViewState = False
        Response.Write(tw.ToString())
        Response.[End]()
    End If
End Sub

如果您遇到错误，例如控件必须放在表单标记内，您可能还需要在后端添加以下代码（参考：export-data-to-excel-from-datatable-gridview-aspnet-csharp）

Public Sub VerifyRenderingInServerForm(control As Control)
    ' Verifies that the control is rendered
End Sub

C＃上述代码版本：

public void ExportToExcel(DataTable dt)
{
    if (dt.Rows.Count > 0) {
        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
        DataGrid dgGrid = new DataGrid();
        dgGrid.DataSource = dt;
        dgGrid.DataBind();
        //Get the HTML for the control.
        dgGrid.RenderControl(hw);
        //Write the HTML back to the browser.
        Response.ContentType = "application/vnd.ms-excel";
        Response.AppendHeader("Content-Disposition", "attachment; filename=Data.xls");
        this.EnableViewState = false;
        Response.Write(tw.ToString());
        Response.End();
    }
}

public void VerifyRenderingInServerForm(Control control)
{
    // Verifies that the control is rendered
}

Answer 2

将Gridview打包到div并在asp.net代码中将其设置为display:none -
例如：<div id="divhidegrid" runat="server" style="display:none;" > <asp:GridView ID="gvtest" runat="server" > </div>喜欢这个

如何从ASPX页面中删除Gridview？

2 个答案: