ASP.NET MVC4：属性参数必须是属性参数类型的常量表达式，typeof表达式或数组创建表达式

I had the following code:

我有以下代码：

    [Required(ErrorMessage = MessageModel.translateMessage("required")))]
    [Display(Name= MessageModel.translateMessage("id"))]
    public string user_id { get; set; }
    [Requ