從數據庫

Question

選擇我收到以下錯誤，當MVC打開DataReader的錯誤，當我在試圖從數據庫中選擇來填充一個變量：

「已經有與此命令 相關聯的打開的DataReader必須先關閉它。「

  //Admin Venue Partial View 
      public ActionResult AdminVenuesTablePartialView() 
      { 
       VenueTownViewModel vt = new VenueTownViewModel(); 
       List<VenueTownViewModel> model = new List<VenueTownViewModel>(); 

       foreach (var venue in db.Venues) 
       { 
        vt.VenueID = venue.VenueID; 
        vt.VenueName = venue.VenueName; 
        vt.VenueTown = db.Towns.Find(venue.TownID).Town; 
        vt.VenueActive = venue.VenueActive; 

        model.Add(vt);     
       } 

       return PartialView("_AdminVenues", model.OrderBy(v => v.VenueName).ToList()); 
      } 

Answer 1

你不能使用它像this.Because類是引用類型。 試試這個：

var venueList = db.Venues; 

    foreach (var venue in venueList) 
       { 
        VenueTownViewModel vt = new VenueTownViewModel(); 
        vt.VenueID = venue.VenueID; 
        vt.VenueName = venue.VenueName; 
        vt.VenueTown = db.Towns.Find(venue.TownID).Town; 
        vt.VenueActive = venue.VenueActive; 

        model.Add(vt); 
       }