排序母公司

Question

我有以下类别：

public class Order 
{ 
    public int Oid {get; set;} 
    public DateTime OrderDate {get; set;} 
    public List<OrderDetails> OrderDetails {get; set;}  
} 

public class OrderDetail 
{ 
    public int Oid {get; set;} 
    public int Price {get; set;} 
    public Order Order {get; set;}  
    public EventSchedule EventSchedule {get; set;}    
} 

public class EventSchedule 
{ 
    public int Oid {get; set;}     
    public BaseEvent BaseEvent {get; set;}  
    public List<OrderDetail> OrderDetails {get; set;}   
} 

public class BaseEvent 
{ 
    public int Oid {get; set;} 
    public string Name {get; set;}    
    public List<EventSchedule> EventSchedules {get; set;} 
} 

我有以下代码：

var result = Database.Orders.Where(o => o.DateTime == dateTime); 

现在，我要排序的result：

case "Date": 
     result = (sortingOrder == "desc") ? result.OrderByDescending(c => c.OrderDate) : result.OrderBy(c => c.OrderDate); 
     break; 

// the problem is here this code not works 
case "EventName": 
     result = (sortingOrder == "desc") ? result.All(o=>o.OrderDetails.OrderBy(d=>d.EventSchedule.BaseEvent.Name)) : ...; 
     break; 

该Order有一个OrderDetail的集合。 OrderDetail有EventSchedule。并且，EventSchedule有BaseEvent。这是可能Order对象由Name财产在BaseEvent？

Answer 1

这个怎么样

case "EventName": 
    result = results.OrderBy(
     r => r.OrderDetails.Select(
      od => od.EventSchedule.BaseEvent.Name).Distinct().FirstOrDefault()); 
//...