ErrorMessageResourceName和ErrorMessage不能同时设置,但我只设置一个

Question

这是我使用MVC2时遇到的错误:

Either ErrorMessageString or ErrorMessageResourceName must be set, but not both.

它来自[Required] Validation DataAnnotation.

堆栈跟踪:

InvalidOperationException: Either ErrorMessageString or ErrorMessageResourceName must be set, but not both.]
   System.ComponentModel.DataAnnotations.ValidationAttribute.SetupResourceAccessor() +89338
   System.ComponentModel.DataAnnotations.ValidationAttribute.FormatErrorMessage(String name) +38
   System.Web.Mvc.<Validate>d__1.MoveNext() +215
   System.Web.Mvc.<Validate>d__5.MoveNext() +735
   System.Web.Mvc.DefaultModelBinder.OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext) +424
   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +732
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +475
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +152
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +709
   System.Web.Mvc.Controller.ExecuteCore() +162
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +58
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +20
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +453
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +371

我把我的视图模型煮到了这个(它会在任何时候出现[Required]属性,在没有的情况下工作正常):

[Required(ErrorMessage = "")]
[DataType(DataType.Text)]
[DisplayName("Property Name")]
public string MyProperty { get; set; }

我的控制器返回一个空的ViewModel,视图中的表单完全空白...只是一个提交按钮.

Answer 1

在我的情况下,我写了ErrorMessage = null,例如:

[EmailAddress(ErrorMessageResourceName = "FORM_FIELD_VALIDATION_EMAIL", ErrorMessageResourceType = typeof(App_GlobalResources.Common.View_Common_Forms), ErrorMessage = null)]

ErrorMessage = " " 不工作.

Answer 2

问题在于将ErrorMessage设置为空字符串.我不得不假设在某些时候检查MVC代码中的String.Empty会导致问题.

将ErrorMessage设置为""(一个空格)解决了这个问题.