下落事件是不是在asp.net

Question

protected void dd_State_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    DataView dv_City = dt_City.DefaultView; 

    dv_City.RowFilter = "StateID='" + dd_State.SelectedValue + "'"; 
    dv_City.Sort = "DistrictName"; 

    dd_City.DataSource = dv_City; 
    dd_City.DataTextField = "DistrictName"; 
    dd_City.DataValueField = "DistrictId"; 
    dd_City.DataBind(); 

    dd_City.Items.Insert(0, "--Select City--"); 
} 

我已經設置autopostback爲true，使viewstate到真正的射擊。仍然在調試時，它不會去下拉選定的索引。該事件不會觸發。

Answer 1

嘗試設置

ViewStateMode="Enabled" 

欲瞭解更多信息，請this和this。