由於SQL ServerVersion錯誤，Web API無法序列化簡單對象

我有一個相當簡單的開始WebAPI項目，但沒有太多。由於SQL ServerVersion錯誤，Web API無法序列化簡單對象

我有一個遺留數據庫，我正在查找一些數據（它的SQL Express 2012 R2）。然後我用某些屬性填充本地類並返回它。

但是當試圖序列化我的簡單的類與此錯誤的JSON序列化失敗：

Error getting value from 'ServerVersion' on 'System.Data.SqlClient.SqlConnection'.

這是我序列化類。該BaseEntity只上有一個屬性，它是數據庫方面

public class User : BaseEntity 
{ 
    public int Id; 
    public string Email; 
    public int Strikes; 
    public Guid AuthenticationKey; 

    public User() 
    { 
    }

這是控制器

public User PutAuthenticate(AuthenticationPayload payload) 
    { 
     if (!ModelState.IsValid) 
     { 
      throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.BadRequest, ModelState)); 
     } 

     User user; 

     try 
     { 
      user = new User(payload.Email, payload.Password); 

      if (user.Strikes >= 3) 
      { 
       HttpError error = new HttpError("Your account has been locked please contact us to unlock"); 
       throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.Unauthorized, error)); 
      } 
     } 
     catch (CANotFoundException) 
     { 
      throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.Unauthorized)); 
     } 

     return user; 

    }

來源

2013-05-27 Anthony Main