ASP.NET C＃，转发器中的动态下拉列表导致完整的回发

问题描述

我在UpdatePanel中有一个页面，其中包含一个Repeater，其中包含服务器控件元素，而所有其他控件的行为均正常，但Drop Down控件每次都会引起完整的回发。

I have a page that contains a Repeater, which contains server control elements, within an UpdatePanel and while all other controls behave normally, the Drop Down control causes a full postback every time.

<asp:Repeater ID="rpt" runat="server">
    <ItemTemplate>
        <asp:SomeWorkingControl ID="swc" runat="server" />
        <asp:DropDownList ID="ddl" runat="server" OnSelectedIndexChanged="ddl_SelectedIndexChanged" AutoPostBack="true">
            <asp:ListItem Text="0" Value="0" />
            <asp:ListItem Text="1" Value="1" />
        </asp:DropDownList>
    </ItemTemplate>
</asp:Repeater>

这是我的代码的样子，DropDownList控件实际上在UserControl中，但是理论上一样。

This is vaugely what my code looks like, the DropDownList control is actually in a UserControl, but the theory is the same.

如果我将事件应用于SomeWorkingControl，则存在Ajax回发，一切都很好。

If I apply an event to SomeWorkingControl then there is an Ajax postback and all is fine.

但是，与DropDownList关联的事件导致完整的回发！我知道通常您会为DropDown设置一个异步触发器，但是由于它是在转发器中创建的（因此我不知道会有多少个触发器），所以我真的不知道它如何工作。

However, the event associated with the DropDownList causes a full postback! I know usually you would set an Async trigger for the DropDown, but since it is created in a repeater (and therefore I can not know how many there will be) so I don't really see how that could work.

有没有人曾经经历过这种情况并且可能知道解决方法？

Is there anybody who has experienced this before and knows a workaround perhaps?

推荐答案

尝试更改此行：

<asp:DropDownList ID="ddl" runat="server" OnSelectedIndexChanged="ddl_SelectedIndexChanged" AutoPostBack="true">

用于：

<asp:DropDownList ID="ddl" runat="server" OnSelectedIndexChanged="ddl_SelectedIndexChanged" AutoPostBack="true" ClientIDMode="AutoID">

最近我遇到了同样的问题，发现ClientIDMode可以解决它。

Recently I had the same problem and I found out that the ClientIDMode can solve it.

请在此处查看：

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