如何通过单击按钮获取网格视图内的下拉列表的值？

Question

我在网格视图中有一个下拉列表。现在我希望当我单击按钮时我可以检查下拉列表的值。我已经为其触发了 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

尝试

  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 内部，因此单击它不会引发 grd_Test_RowCommand，要么移动按钮在 GridView 内，或者您必须像这样手动引发它：

从 asp.net 论坛复制：

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

现在关于您原来的问题，这就是您如何获取 DropDownList 的选定值里面RowCommand 事件：

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