System.NullReferenceException: 'Object reference not set to an instance of an object.'
<pre>public class ChatRoom:KernelEntity { public virtual ICollection<ChatRoomUsers> ChatRoomUsers { get; set; } public virtual ICollection<Message> Messages { get; set; } }
public class ChatRoomUsers { [ForeignKey("AppUser")] public string UserId { get; set; } public virtual AppUser AppUser { get; set; } [ForeignKey("ChatRoom")] public Guid ChatRoomId{ get; set; } public virtual ChatRoom ChatRoom { get; set; } }
else { ChatRoom chat = new ChatRoom(); _uow.ChatRoom.Add(chat); ChatRoomUsers chatRoom = new ChatRoomUsers(); chatRoom.ChatRoomId = chat.Id; chatRoom.UserId = user1.Id; _uow.ChatRoomUsers.Add(chatRoom); ChatRoomUsers chatRoom1 = new ChatRoomUsers(); chatRoom1.ChatRoomId = chat.Id; chatRoom1.UserId = user2.Id; _uow.ChatRoomUsers.Add(chatRoom1); _uow.SaveChange(); }
var
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