Repeater绑定dictionary数据源代码及报错解决

asp:Repeater ID="Repeater1" runat="server">
ItemTemplate>
%# ((KeyValuePairint, ListUser>>)Container.DataItem).Key %> br />
asp:Repeater ID="Repeater2" runat="server" DataSource='%# ((KeyValuePairint, ListUser>>)Container.DataItem).Value %>'>
ItemTemplate>
%# (Container.DataItem as User).Id %>
%# (Container.DataItem as User).Name %>
/ItemTemplate>
/asp:Repeater>
hr />
/ItemTemplate>
/asp:Repeater>

public partial class Temp : System.Web.UI.Page
{
Dictionaryint, ListUser>> dict = new Dictionaryint, ListUser>>();
protected void Page_Load(object sender, EventArgs e)
{
dict.Add(1, new ListUser>
{
new User{Id = 1, Name = "aa"}
,new User{Id = 2, Name = "bb"}
});
dict.Add(2, new ListUser>
{
new User{Id = 3, Name = "cc"}
,new User{Id = 4, Name = "dd"}
});
Repeater1.DataSource = dict;
Repeater1.DataBind();
}
}
public class User
{
public int Id{get;set;}
public string Name{get;set;}
}