在VB.NET中以编程方式将OnSelectedIndexChanged设置为DropDownList

Question

I have tried below code but it didn't work: 我已经尝试了下面的代码，但是没有用：

    DropDownList1.SelectedIndexChanged += new EventHandler ( doSub );

It is in C# not VB 它在C＃中而不是VB中
When I type DropDownList1. 当我键入DropDownList1时。 intellisense doesn't bring the SelectedIndexChanged method 智能感知没有带来SelectedIndexChanged方法
And last it complains about SelectedIndexChanged is an event and must be called by RaiseEvent 最后它抱怨SelectedIndexChanged是一个事件，必须由RaiseEvent调用

I'm trying to make ddls dynamically based on SelectedValue of each other, so I need to set the OnSelectedIndexChanged values programmatically instead of declarativly like this: 我试图基于彼此的SelectedValue动态地使ddls动态变化，所以我需要以编程方式设置OnSelectedIndexChanged值，而不是像这样声明：

    <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DoSub">
    </asp:DropDownList>

Thanks in advance. 提前致谢。

Tip: Remove the AutoEventWireup="false" in @Page section to get solution to work. 提示：删除@Page部分中的AutoEventWireup =“ false”以获取解决方案。

Answer 1

Use AddHandler to attach an event handler. 使用AddHandler附加事件处理程序。

Syntax: 句法：

AddHandler obj.EventName, AddressOf HandlerName

Example: 例：

<script runat="server">
    Protected Sub Page_Load(sender As Object, e As System.EventArgs)
        AddHandler DropDownList1.SelectedIndexChanged, AddressOf DoSub
    End Sub
    Sub DoSub(sender As Object, e As System.EventArgs)
        Response.Write(DropDownList1.SelectedValue)
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
            <asp:ListItem>Foo</asp:ListItem>
            <asp:ListItem>Bar</asp:ListItem>
        </asp:DropDownList>

    </div>
    </form>
</body>

Answer 2

AddHandler DropDownList1.SelectedIndexChanged, AddressOf FunctionName

在VB.NET中以编程方式将OnSelectedIndexChanged设置为DropDownList

问题描述

2 个解决方案

解决方案1
3 已采纳 2012-08-29 08:20:33

解决方案2
1 2012-08-29 08:54:22

在VB.NET中以编程方式将OnSelectedIndexChanged设置为DropDownList

问题描述

2 个解决方案

解决方案1 3 已采纳 2012-08-29 08:20:33

解决方案2 1 2012-08-29 08:54:22

解决方案1
3 已采纳 2012-08-29 08:20:33

解决方案2
1 2012-08-29 08:54:22