ASP.NET DropDownList SelectedItem.Value不变 [英] Asp.NET DropDownList SelectedItem.Value not changing

问题描述

标记：

            <div style="float:left;margin-top:15px;width:80px">
                <asp:DropDownList ID="MyList" runat="server" Width="100px"></asp:DropDownList>
            </div>

代码：

        // clear vehicles list
        MyList.Items.Clear();

        // add 'all' option
        MyList.Items.Add(new ListItem("ALL", "0"));

        // add assets
        foreach (CustomClass item in items)
            MyList.Items.Add(new ListItem(item.Name, item.ID.ToString()));

由于没有必要，因此没有事件触发SelectedIndexChanged。

No event triggering for SelectedIndexChanged since it's not necessary.

当我单击用于回发的按钮时，selecteditem的值仍然是DropDownList中第一项的值。我想念什么？

When I click the button for postback, the value of the selecteditem remains the value of the first item in the DropDownList. What am I missing?

注意
请停止回复和编辑帖子。

NOTE Please stop replying and editing posts. We may leave it as it is since it has been answered already.

推荐答案

如果要在 Page_Load ，实际上您还需要重置SelectedItem。

If you're databinding in Page_Load, you're essentially also resetting the SelectedItem.

您应该包装 Page_Load中存在的任何绑定代码。 在 if（！IsPostBack）块中。

if(!Page.IsPostBack)
{

    // Your binding code here ...

}

这篇关于ASP.NET DropDownList SelectedItem.Value不变的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！