当SelectedItemEvent被触发时,SelectedItem不会改变(ASP.Net DropDown)

Question

我有一个ASP DropDown,声明如下:

<asp:DropDownList ID="DropDown1" 
    runat="server" 
    OnSelectedIndexChanged="DropDown1_SelectedIndexChanged"
    AutoPostBack="true">
</asp:DropDownList>

数据以这种方式填充:

DropDown1.DataSource = source;
DropDown1.DataTextField = "Key";
DropDown1.DataValueField = "Value";
DdlCat1.DataBind();

"source"是一本字典:

Dictionary<int, string> source = new Dictionary<int, string>();

selectedIndexChanged方法如下所示:

public void DropDown1_SelectedIndexChanged(object sender, EventArgs e)
{
    DropDownList temp = (DropDownList)sender;
    Console.WriteLine(temp.SelectedValue);
}

现在让我说我的下拉列表中有item1,item2和item3.目前我选择了item1.现在问题是,如果我在item2中单击,则会触发SelectIndexChanged方法但是SelectedValue始终保持在"item1".那么,我做错了什么？

Answer 1

您的数据填写在哪里？如果您的数据是在页面加载时填充的,那么由于页面生命周期,您每次都会覆盖数据源