序列不包含任何元素

Question

我正在使用一个类来存储数据，然后使用控制器和视图来显示网站上的屏幕上的数据使用MVC3但是我遇到了一个错误，帮助将不胜感激。

类别：

public class SampleData : DropCreateDatabaseIfModelChanges<TicketBookingEntities> 
    { 
     protected override void Seed(TicketBookingEntities context) 
     { 
      var productions = new List<Production> 
      { 
       new Production { Name = "Peter Pan" }, 
       new Production { Name = "Mary Poppins" }, 
       new Production { Name = "Pirates of the Carribean" }, 
       new Production { Name = "Joseph" }, 
       new Production { Name = "Billy Elliot" }, 

      }; 

      var directors = new List<Director> 
      { 
       new Director { Name = "Jason Brown" }, 
       new Director { Name = "Dan Elish" }, 
       new Director { Name = "Lee Hall" }, 
       new Director { Name = "Billie Armstrong" }, 
       new Director { Name = "Willy Russell" }, 

      }; 

      new List<Performance> 
      { 


       new Performance {Title = "Test", Genre = productions.Single(g => g.Name == "Peter Pan"), Director = directors.Single(a => a.Name == "Jason Brown"), Price = 9.99M, AlbumArtUrl = "/Content/Images/placeholder.gif" }, 


      }.ForEach(a => context.Performances.Add(a)); 
     } 
    } 
} 

控制器：

public ActionResult Browse(string genre) 
     { 
      var productionModel = storeDB.Productions.Include("Performances") 
       .Single(g => g.Name == genre); 

      return View(productionModel); 

     } 

检视：

@model Assignment2.Models.Production 

@{ 
    ViewBag.Title = "Browse"; 
} 

<h2>Browsing Production: @Model.Name</h2> 
<ul> 
    @foreach (var performance in Model.Performances) 
    { 
     <li> 
      @performance.Title 

     </li> 
    } 

</ul> 

的错误：

Sequence contains no elements 

Answer 1

您没有列表，只有一个元素。取出foreach循环。

Answer 2

管理解决问题，改变控制器上的流派到生产