s-5_2_2.cs

[DataContract]
public class Response
{
  [DataMember]
  public List<ResponseError> Errors { get; set; }

  [DataMember]
  public List<string> Warnings { get; set; }

  [DataMember]
  public bool Success { get; set; }

  public Response() { Success = true; }

  public Response(params string[] errors)
  {
    Success = false;
    Errors = new List<ResponseError>();
    foreach (string s in errors) { Errors.Add(new ResponseError { ErrorMessage = s }); }
  }

  public static Response Fail(string msg)
  {
    return new Response
    {
      Success = false,
      Errors = new List<ResponseError>                             
      { 
        new ResponseError                            
        {
          ErrorMessage = msg                            
        } 
      }
    };
  }

  public Response<string> ToStringResponse(string value)
  {
    return new Response<string>(value)
    {
      Errors = this.Errors,
      Success = this.Success,
      Warnings = this.Warnings
    };
  }
}

[DataContract]
public class Response<T> : Response where T : class 
{
  [DataMember]
  public T Model { get; set; }

  public Response() { Success = true; }
  public Response(T model) : base() { Model = model; }
}

[DataContract]
public class ResponseError
{
  [DataMember]
  public object AttemptedValue { get; set; }

  [DataMember]
  public string ErrorMessage { get; set; }

  [DataMember]
  public string ErrorId { get; set; }

  [DataMember]
  public string PropertyName { get; set; }
}