如何通过单击按钮获取网格视图内的下拉列表的值？

Question

我在 gridview 中有一个下拉列表。现在我想当我点击一个按钮然后我可以检查下拉列表的值。我已经为它触发了 gridview 的 rowcommand 事件，但调试器无法到达那里..请帮助我..我的代码是

  Protected Sub grd_Test_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles grd_Test.RowCommand
    If e.CommandName = "Select" Then


     End If
End Sub

我的源代码是

   <asp:GridView ID="grd_UnAssignProperties" runat="server" AutoGenerateColumns="False"><Columns>
                    <asp:TemplateField HeaderText="Assign To">
                        <ItemTemplate>
                            <asp:DropDownList ID="drp_UnAssignProp" runat="server">

                            <asp:ListItem  Value="" >Default</asp:ListItem>
                            </asp:DropDownList>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns></asp:GridView><tr><td><asp:Button ID="btn_Save" runat="server" CommandName="Select" Text="Submit"  />

Answer 1

试试这个

DropDownList ddl = (DropDownList)GridView1.Rows[e.RowIndex].Cells[0].FindControl("drp_UnAssignProp");
string val = ddl.SelectedValue;

Answer 2

试试

  string val = (DropDownList)GridView1.Rows[e.RowIndex].Cells[0]
               .FindControl("drp_UnAssignProp").SelectedValue;

Answer 3

首先，由于按钮btn_Save不在GridView内，点击它不会提升grd_Test_RowCommand，要么将按钮移动到GridView内，要么你必须像手动一样提升它这个：

复制自asp.net论坛：

Protected Sub Button1_Click(sender As Object, e As EventArgs)
    Dim commandArgs As New CommandEventArgs("Command Name Here", "Your Command Argument Here")
    'You can pass any row
    'You can also skip the row parameter and get the row from Command Argument
    Dim eventArgs As New GridViewCommandEventArgs(GridView1.Rows(0), GridView1, commandArgs)
    GridView1_RowCommand(GridView1, eventArgs)
End Sub

现在关于您的原始问题，这是您如何在 RowCommand 事件中获取 DropDownList 的选定值：

编辑：修复代码以获取引发 RowCommand 事件的当前行

Protected Sub grd_Test_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles grd_Test.RowCommand
    If e.CommandName = "Select" Then
        Dim index As Integer = Convert.ToInt32(e.CommandArgument)
        Dim row As GridViewRow = DirectCast(DirectCast(e.CommandSource, LinkButton).NamingContainer, GridViewRow)
        Dim ddl as DropDownList = CType(row.FindControl("drp_UnAssignProp", DropDownList)
        Dim selectedValue as String = ddl.Text
     End If
End Sub