Gridview 与标题中的组合框绑定

Question

谁能告诉我如何在 ASP.Net 4 中绑定到 gridview，其中 gridview 的第一行应该是标题，第二行应该是每列的组合框，第三行是开头我的实际数据源。

如果您可以想象我想要实现的目标是能够在数据网格中的每一列与另一个数据源之间创建绑定。该绑定是通过用户在组合框中选择一个值来创建的。然而，无论我如何尝试，我似乎都无法实现这一目标。

HeaderText1 | HeaderText2 | HeaderText3
ComboBox1   | ComboBox2   | ComboBox3 
DataRow1    | DataRow1    | DataRow1 
DataRow2    | DataRow2    | DataRow2 
DataRow3    | DataRow3    | DataRow3

Answer 1

您可以使用 TemplateColumn 轻松地将 DropDownList 放入 Gridview 列中：

<asp:GridView runat="server" ID="ComboboxGridView">
    <Columns>
        <asp:TemplateField HeaderText="Column 1">
            <HeaderTemplate>
                <asp:DropDownList runat="server" ID="Column1DropDownList" />
            </HeaderTemplate>
            <ItemTemplate>
                <asp:Label runat="server" ID="Column1DisplayLabel" Text='<%# Eval("Column1") %>' />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

并且可以轻松地将 DropDownList 绑定到另一个数据源，特别是您使用 DataSource 控件时。我不清楚你在标题中使用 DropDownLists 做什么 - 是为了过滤 GridView 中出现的行吗？

Answer 2

因此，对于任何好奇的人来说，这似乎是问题的解决方案。

Private Sub grdMainGrid_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles grdMainGrid.RowCreated
    If e.Row.RowType = DataControlRowType.Header Then
        For Each itm As TableCell In e.Row.Cells
            itm.Text = GenerateHeaderHTML()
        Next
    End If
End Sub

PS：如果有人有更好的解决方案，我很乐意听到他们:-)

以下是我在GenerateHeaderHTML()中的代码。我的代码是一个非常具体的案例（而且概率远非很好）。但请注意，您可以使用任何您想要的 html。

    Private Sub grdMainGrid_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles grdMainGrid.RowCreated
            If Me.BoundedObjects IsNot Nothing Then
                If e.Row.RowType = DataControlRowType.Header Then
                    Dim PrimitivePropertyNames As List(Of String) = ParserHelper.GetPrimitivePropertyNames(Me.BoundedObjects.ToList)
                    Dim i As Integer = 0
                    For Each itm As TableCell In e.Row.Cells
                        itm.Text = ucStockImport.CreateBindingHeaderTable(itm.Text, PrimitivePropertyNames, i.ToString)
                        i += 1
                    Next
                End If
            Else
                Throw New StockImportException("ucStockImport.BoundedObjects Is Nothing")
            End If
        End Sub

        Private Shared Function CreateBindingHeaderTable(ByVal HeaderText As String, ByVal PropertyNames As List(Of String), ByVal ID As String) As String
            Return String.Format("<table><tr><td>{0}</td></tr><tr><td>{1}</td></tr></table>", HeaderText, ucStockImport.CreateBindedObjectDropDownList(PropertyNames, ID))
        End Function

        Private Shared Function CreateBindedObjectDropDownList(ByVal PropertyNames As List(Of String), ByVal ID As String) As String
            Dim strBuilder As New StringBuilder

            strBuilder.Append(String.Format("<option value=""{0}"">{1}</option>", i, propName))

            Dim i As Integer = 0

            For Each propName As String In PropertyNames
                strBuilder.Append(String.Format("<option value=""{0}"">", i) & propName & "</option>")
                i += 1
            Next

            strBuilder.Append("</select>")
            Return strBuilder.ToString
        End Function