多个数据源到单个下拉列表

Question

如何将多个数据源设置为单个下拉列表？

DrpPosition.ClearSelection(); 
     DrpPosition.DataSource = AdvertizeManager.GetList("", "", "", ""); 
     DrpPosition.DataTextField = "PNAME"; 
     DrpPosition.DataValueField = "ADID"; 
     DrpPosition.DataBind(); 
     DrpPosition.DataSource = CategoryManager.GetList("", "", "", ""); 
     DrpPosition.DataTextField = "NAME"; 
     DrpPosition.DataValueField = "CATID"; 
     DrpPosition.DataBind(); 

Answer 1

您可以使用LINQ轻松地解决这个问题：

 var advertizes = AdvertizeManager.GetList... 
     var categories = CategoryManager.GetList.... 

     // create your annonymous type 
     var customAdvertizes = from advertize in advertizes 
       select new 
       { 
        Value = advertize.ADID, 
        Text = advertize.PNAME 
       }; 

     var finalQuery = customAdvertizes.Concat(
      from category in categories 
      select new 
      { 
       Value = category.CATID, 
       Text = category.NAME 
      } 
     ); 

然后只需将它绑定到你的DropDownList

DrpPosition.DataSource = finalQuery; 
    DrpPosition.DataTextField = "Text"; 
    DrpPosition.DataValueField = "Value"; 
    DrpPosition.DataBind(); 

Answer 2

这是不可能的，但你可以在绑定之前合并你的数据源。

或者你可以使用

foreach(var item in yourDataSourceComplete)//yourDataSourceComplete = List1 + List2 
{ 
    ..... 
    DrpPosition.Items.Add(Yourkey, YourValue); 
}