ASP.NET MVC - 「驗證類型名稱必須是唯一的。」

Question

我在我的模型中使用ASP.NET MVC 3和數據註解，並且想要從數據庫中檢索錯誤消息。所以我寫了繼承屬性：

public class LocalizedRequiredAttribute : RequiredAttribute 
{ 
    public LocalizedRequiredAttribute(){} 

    public override string FormatErrorMessage(string name) 
    { 
     return GetByKeyHelper.GetByKey(this.ErrorMessage); 
    }  
} 

public class LocalizedRegularExpressionAttribute : RegularExpressionAttribute 
{ 
    public LocalizedRegularExpressionAttribute(string pattern) : base(pattern){} 

    public override string FormatErrorMessage(string name) 
    { 
     return GetByKeyHelper.GetByKey(this.ErrorMessage); 
    }  
} 

我寫2「適配器」這些屬性，以使客戶端驗證，比如這個：

public class LocalizedRequiredAttributeAdapter : DataAnnotationsModelValidator<LocalizedRequiredAttribute> 
{ 
    public LocalizedRequiredAttributeAdapter(ModelMetadata metadata, ControllerContext context, LocalizedRequiredAttribute attribute) 
     : base(metadata, context, attribute) 
    { 
    } 

    public static void SelfRegister() 
    { 
     DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(LocalizedRequiredAttribute), typeof(RequiredAttributeAdapter)); 
    } 

    public override IEnumerable<ModelClientValidationRule> GetClientValidationRules() 
    { 
     return new[] { new ModelClientValidationRequiredRule(ErrorMessage) }; 
    } 
} 

在我的Global.asax我有這兩條線：

 LocalizedRegularExpressionAttributeAdapter.SelfRegister(); 
     LocalizedRequiredAttributeAdapter.SelfRegister(); 

我得到一個異常「低調中的客戶端驗證規則驗證類型名稱必須是唯一的下列驗證類型被視爲不止一次：需要」時，我的模型呈現HTM L爲此屬性：

[LocalizedRequired(ErrorMessage = "global_Required_AccountName")] 
    [LocalizedRegularExpression(User.ADAccountMask, ErrorMessage = "global_Regex_AccountName")]   
    public string AccountName { get; set; } 

什麼是錯？

Answer 1

我猜，也許讀取行：

DataAnnotationsModelValidatorProvider.RegisterAdapter(
     typeof(LocalizedRequiredAttribute), 
     typeof(RequiredAttributeAdapter)); 

應改爲：

DataAnnotationsModelValidatorProvider.RegisterAdapter(
     typeof(LocalizedRequiredAttribute), 
     typeof(LocalizedRequiredAttributeAdapter)); 

Answer 2

這是在一個類似的問題的正確答案： https://stackoverflow.com/a/5418124/80434

基本上，你不能同時擁有兩個屬性

Answer 3

我基本上有同樣的問題，我設法用下面一段代碼來解決這個問題：

using System; 
using System.Web.Mvc; 

而且有效性規則：

public class RequiredIfValidationRule : ModelClientValidationRule 
{ 
    private const string Chars = "abcdefghijklmnopqrstuvwxyz"; 

    public RequiredIfValidationRule(string errorMessage, string reqVal, 
     string otherProperties, string otherValues, int count) 
    { 
     var c = ""; 
     if (count > 0) 
     { 
      var p = 0; 
      while (count/Math.Pow(Chars.Length, p) > Chars.Length) 
       p++; 

      while (p > 0) 
      { 
       var i = (int)(count/Math.Pow(Chars.Length, p)); 
       c += Chars[Math.Max(i, 1) - 1]; 
       count = count - (int)(i * Math.Pow(Chars.Length, p)); 
       p--; 
      } 
      var ip = Math.Max(Math.Min((count) % Chars.Length, Chars.Length - 1), 0); 
      c += Chars[ip]; 
     } 

     ErrorMessage = errorMessage; 
     // The following line is where i used the unique part of the name 
     // that was generated above. 
     ValidationType = "requiredif"+c; 
     ValidationParameters.Add("reqval", reqVal); 
     ValidationParameters.Add("others", otherProperties); 
     ValidationParameters.Add("values", otherValues); 
    } 
} 

我希望這有助於。