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();
“源”是字典:
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);
}
现在说我的下拉菜单中有item1,item2和item3。目前,我已经选择了item1。现在的问题是,如果我单击item2,则会触发SelectIndexChanged方法,但SelectedValue始终保持在“ item1”。那么,我在做什么错呢?
最佳答案
您的数据在哪里填充?如果您的数据是在页面加载时填充的,则由于页面生命周期的原因,您每次都会覆盖数据源