DDL没有开火

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当用户选择元素时，如何触发Dropdownlist？我的 代码是： Private Sub DropDownList1_SelectedIndexChanged（ByVal sender As Object，ByVal $ b $ as As System.EventArgs）处理DropDownList1。 SelectedIndexChanged Dim selectedItem = DropDownList1.SelectedValue Me.Label1.Text ="" + selectedItem +"" End Sub

How do I get a Dropdownlist to fire when the user selects an element? My code is: Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged Dim selectedItem = DropDownList1.SelectedValue Me.Label1.Text = "" + selectedItem + "" End Sub

推荐答案

嗨Niggy， 确保你的asp：dropdownlist标签有runat =" server" atrribute和 事件在InitialiseComponent子中正确连接。 HTH Dan " Niggy"写道： Hi Niggy, Make sure your asp:dropdownlist tag has the runat="server" atrribute, and that the event is wired up correctly in the InitialiseComponent sub. HTH Dan "Niggy" wrote: 当用户选择元素时，如何触发Dropdownlist？我的代码是： Private Sub DropDownList1_SelectedIndexChanged（ByVal sender As Object，ByVal e As System.EventArgs）Handles DropDownList1.SelectedIndexChanged Dim selectedItem = DropDownList1.SelectedValue Me.Label1.Text ="" + selectedItem +"" End Sub How do I get a Dropdownlist to fire when the user selects an element? My code is: Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged Dim selectedItem = DropDownList1.SelectedValue Me.Label1.Text = "" + selectedItem + "" End Sub

谢谢Dan。 RUNAT = QUOT;服务器"没关系，但是没有引用一个事件在中的InitialiseComponent子。我该怎么办？ Thanks Dan. Runat="server" is ok, but there is no reference to an event in the InitialiseComponent sub. What should I put?

确保AutoPostBack = true Eliyahu " Niggy" <镍*** @ discussions.microsoft>在留言中写道 新闻：B1 ********************************** @ microsof t ... Make sure AutoPostBack = true Eliyahu "Niggy" <Ni***@discussions.microsoft> wrote in message news:B1**********************************@microsof t... 当用户选择元素时，如何触发Dropdownlist？我的代码是： Private Sub DropDownList1_SelectedIndexChanged（ByVal sender As Object， ByVal e As System.EventArgs）Handles DropDownList1.SelectedIndexChanged Dim selectedItem = DropDownList1.SelectedValue Me.Label1.Text ="" + selectedItem +"" End Sub How do I get a Dropdownlist to fire when the user selects an element? My code is: Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged Dim selectedItem = DropDownList1.SelectedValue Me.Label1.Text = "" + selectedItem + "" End Sub