问MVC 4:如何使用“部分验证”技术？

EN

      public class DontValidateEmailAttribute : ActionFilterAttribute 
         {  public override void OnActionExecuting(ActionExecutingContext filterContext) 
                 {
                    var modelState = filterContext.Controller.ViewData.ModelState;     
                    var incomingValues = filterContext.Controller.ValueProvider;    
                    var key = modelState.Keys.Single(x => incomingValues.Equals("Email"));
                    modelState[key].Errors.Clear();  
                  }
          }