如何使用linq執行網格視圖的排序操作？

Question

如何對網格視圖執行排序操作。我已經完成了此操作（下面的代碼），但是它是 拋出以下錯誤。

錯誤：

the type arguments for method 'System.Linq.Enumerable.OrderBy<TSource,TKey>(System.Collections.Generic.IEnumerable<TSource>, 
    System.Func<TSource,TKey>, System.Collections.Generic.IComparer<TKey>)' 
    cannot be inferred from the usage. 

代碼：

gridview1.DataSource = (from bk in bookList 
           join ordr in bookOrders 
           on bk.BookID equals ordr.BookID 
           select new 
           { 
            BookID = bk.BookID, 
            BookNm = bk.BookNm, 
            PaymentMode = ordr.PaymentMode 
           }).AsQueryable().OrderBy(e.SortExpression,e.SortDirection); 

Answer 1

您與LINQ的混合基於字符串的分選機構（GridView.Sorting事件）（lambda表達式基於排序）。

文章：Handle GridView.OnSorting() and create sorting expression dynamically using LINQ你想要做

Answer 2

什麼，最後我做了以下

protected void gridview1_Sorting(object sender, GridViewSortEventArgs e) 
     { 
      int p = int.Parse(Session["p"].ToString()); 
      p++; 
      Session["p"] = p; 
      if (p % 2 == 0) 
      { 
       var A = from bk in bookList 
         join ordr in bookOrders 
         on bk.BookID equals ordr.BookID 
         select new 
         { 
          BookID = bk.BookID, 
          BookNm = bk.BookNm, 
          PaymentMode = ordr.PaymentMode 
         }; 


       gridview1.DataSource = A.OrderBy(x => x.BookID); 
       gridview1.DataBind(); 

      } 
      else 
      { 
       var A = from bk in bookList 
         join ordr in bookOrders 
         on bk.BookID equals ordr.BookID 
         select new 
         { 
          BookID = bk.BookID, 
          BookNm = bk.BookNm, 
          PaymentMode = ordr.PaymentMode 
         }; 


       gridview1.DataSource = A.OrderByDescending(x=>x.BookID); 
       gridview1.DataBind(); 

      } 



     }