Linq中

Question

首先DDL填寫使用值一個DDL

我填補了國家DDL使用文本在全國DDL

foreach (var VARIABLE in ProfileMasterDAL.bindcountry()) 
      { 
       if (VARIABLE.ToString().Contains(DropDownList1.SelectedItem.Text)) 
       { 
        var query = from row in ProfileMasterDAL.bindstate().ToString() 
           where 
            ProfileMasterDAL.bindstate().ToString().Contains(DropDownList1.SelectedItem.Text) 
           select row; 
        DropDownList2.DataSource = query; 
        DropDownList2.DataBind(); 
       } 
      } 

，但在查詢我得到枚舉產生任何結果，各州DDL是空的。

public static IEnumerable bindstate() 
    { 
     var states = from b in getdata().Descendants("state").SelectMany(state => state.Elements("text")) 
     orderby (string) b 
     select (string) b; 

     return states; 

    } 

Answer 1

好了，根據意見和更新你的問題，我想這是你想要什麼：

foreach (var VARIABLE in ProfileMasterDAL.bindcountry()) 
{ 
    if (VARIABLE.ToString().Contains(DropDownList1.SelectedItem.Text)) 
    { 
     var query = from row in ProfileMasterDAL.bindstate() 
        where row.Contains(DropDownList1.SelectedItem.Text) 
        select row; 
     DropDownList2.DataSource = query; 
     DropDownList2.DataBind(); 
    } 
}