User 
 
ID  | Name 
0   | A 
1   | B 
 
Friends Table ( This table is used to build the one to many relationship ) 
 
User_ID | Friend_ID 
 1      |     0 
 0      |     1

这是我的GetMethod

[HttpGet]
        public Models.User   Authenticate()
        {
            try
            {
                return   db.Users.SingleOrDefault(x => x.ID == 0 ) ; 
            } 
            catch
            {
                return null;
            }
        }

如果我得到并返回一个用户实体,那么我会得到打击错误

任何人都可以帮我修复以下错误？

{“Message”:”An error has occurred.”,”ExceptionMessage”:”The ‘ObjectContent`1’ type Failed to serialize the response body for content type ‘text/html; charset=utf-8’.”,”ExceptionType”:”System.InvalidOperationException”,”StackTrace”:null,”InnerException”:{“Message”:”An error has occurred.”,”ExceptionMessage”:”Self referencing loop detected with type ‘System.Data.Entity.DynamicProxies.Friend_E5C79F4736EB2750392FFC7061B18E9C12F15F9583409603C75C5D1B1F7358D4’. Path ‘Friends1[0].User.Friends’.”,”ExceptionType”:”Newtonsoft.Json.JsonSerializationException”,”StackTrace”:” at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CheckForCircularReference(JsonWriter writer,Object value,JsonProperty property,JsonContract contract,JsonContainerContract containerContract,JsonProperty containerProperty)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer,IWrappedCollection values,JsonArrayContract contract,JsonProperty member,JsonContainerContract collectionContract,JsonProperty containerProperty)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer,JsonContract valueContract,JsonProperty containerProperty)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer,JsonObjectContract contract,JsonProperty containerProperty)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter,Object value)\r\n at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter,Object value)\r\n at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter,Object value)\r\n at System.Net.Http.Formatting.JsonMediaTypeFormatter.<>c__DisplayClassd.b__c()\r\n at System.Threading.Tasks.TaskHelpers.RunSynchronously(Action action,CancellationToken token)”}}