MVC2 DataAnnotations具有继承验证 [英] MVC2 DataAnnotations validation with inheritance

问题描述

我有一个.NET 2.0类的标记virtual.I的属性需要使用类作为一个MVC2应用程序的模型。所以，我创建了一个.NET 3.5类从.NET 2.0类继承并添加了DataAnnotations属性的新类被覆盖的属性。什么我已经做了片断如下

I have a .NET 2.0 class the properties of which are marked virtual.I need to use the class as a model in a MVC2 application. So, I have created a .NET 3.5 class inheriting from the .NET 2.0 class and added the DataAnnotations attributes to the overriden properties in the new class. A snippet of what I have done is below

// .NET 2.0 class
public class Customer
{
   private string _firstName = "";
   public virtual string FirstName
   {
      get { return _firstName; }
      set { _firstName = value; }
   }
}

// .NET 3.5 class
public class MVCCustomer : Customer
{
   [Required(ErrorMessage="Firstname is required")]
   public override string FirstName
   {
      get { return base.FirstName; }
      set { base.FirstName = value; }
   }
}

我已经使用了类作为模型使用HtmlFor佣工MVC2视图。 Serverside集团的验证工作正常，但在客户端验证没有。具体地，不显示在页面上的验证错误。

I have used the class as the model for a MVC2 view using the HtmlFor helpers. Serverside validation works correctly but the client side validation does not. Specifically the validation error is not displayed on the page.

我在想什么，或者仅是有可能做到这一点使用哥们类。

What am I missing, or is it only possible to do this using buddy classes.

感谢。

编辑1：
现在我与好友验证类尝试这样做，那也不行。

EDIT 1: I have now tried this with buddy validation classes and that doesn't work either.

编辑2：
我现在已经摸索出供给HtmlFor佣工拉姆达前pression引起的问题。对于例如。

EDIT 2: I have now worked out that the lambda expression supplied to the HtmlFor helpers is causing the problem. For e.g.

Html.TextBoxFor（M => m.FirstName）调用它计算MemberEx pression的DeclaringType（如pression.Body）作为Customer类，而不是ModelMetadata.FromLambdaEx pression方法在MVCCustomer类。

Html.TextBoxFor(m => m.FirstName) calls the ModelMetadata.FromLambdaExpression method which evaluates the DeclaringType of the MemberExpression (expression.Body) as the Customer class and not the MVCCustomer class.

我试图改变在lambda前pression到Html.TextBoxFor（（MVCCustomer M）=> m.FirstName），但DeclaringType还是客户。

I have tried changing the lambda expression to Html.TextBoxFor((MVCCustomer m) => m.FirstName) but the DeclaringType is still Customer.

有没有一种方法，我可以得到DeclaringType为类型MVCCustomer，而不是客户。

Is there a way I can get the DeclaringType to be of type MVCCustomer and not Customer.

推荐答案

现在我已经通过使用属性的新关键字在.NET 3.5类，如下

I have now got around this by using the new keyword on the properties in the .net 3.5 class as below

// .NET 2.0 class
public class Customer { 
  private string _firstName = "";
  public string FirstName
  {
     get { return _firstName; }
     set { _firstName = value; }
  }
}

// .NET 3.5 class
public class MVCCustomer : Customer {
   [Required(ErrorMessage="Firstname is required")]
   public new string FirstName 
   { 
      get { return base.FirstName; } 
      set { base.FirstName = value; }
   }
}

这现在可以正常工作和DataAnnotations从MVCCustimer类属性的正确应用。

This now works as expected and the DataAnnotations attributes from the MVCCustimer class are applied correctly.

希望这有助于

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