複雜驗證擴展

Question

在爲Fluent驗證規則構建器編寫擴展時，我提出了進行更復雜的驗證並將其與客戶端驗證連接起來的想法。我已經成功創建了基於另一個屬性驗證一個屬性的擴展，等等。我所掙扎的是在多個領域的驗證：

擴展方法作爲https://fluentvalidation.codeplex.com/wikipage?title=Custom&referringTitle=Documentation

public static IRuleBuilderOptions<T, TProperty> Required<T, TProperty>(this IRuleBuilder<T, TProperty> ruleBuilder, Action<MyRuleBuilder<T>> configurator) 
    { 
     MyRuleBuilder<T> builder = new MyRuleBuilder<T>(); 

     configurator(builder); 

     return ruleBuilder.SetValidator(new MyValidator<T>(builder)); 
    } 

的MyRuleBuilder類允許添加規則流利：

public class MyRuleBuilder<T> 
{ 
    public Dictionary<string, object> Rules = new Dictionary<string,object>(); 

    public MyRuleBuilder<T> If(Expression<Func<T, object>> exp, object value) 
    { 
     Rules.Add(exp.GetMember().Name, value); 

     return this; 
    } 
} 

然後視圖模型和查看模型驗證器規則如下所示：

public class TestViewModel 
{ 
    public bool DeviceReadAccess { get; set; } 
    public string DeviceReadWriteAccess { get; set; } 
    public int DeviceEncrypted { get ; set; } 
} 

RuleFor(x => x.HasAgreedToTerms) 
    .Required(builder => builder 
     .If(x => x.DeviceReadAccess, true) 
     .If(x => x.DeviceReadWriteAccess, "yes") 
     .If(x => x.DeviceEncrypted, 1)); 

問題：

上述工作正常，但我不喜歡的是「If」功能。它不會強制所選屬性類型的值。例如：

RuleFor(x => x.HasAgreedToTerms) 
    .Required(builder => builder 
     .If(x => x.DeviceReadAccess, true) // I would like the value to be enforced to bool 
     .If(x => x.DeviceReadWriteAccess, "yes") // I would like the value to be enforced to string 

// Ideally something like 

// public MyRuleBuilder<T> If(Expression<Func<T, U>> exp, U value) but unfortunately U cannot be automatically inferred 

這是可能的這種架構或我應採取不同的方法？

謝謝。

Answer 1

我認爲你可以添加另一個通用參數U的方法。

public class MyRuleBuilder<T> 
{ 
    public Dictionary<string, object> Rules = new Dictionary<string, object>(); 

    public MyRuleBuilder<T> If<U>(Expression<Func<T, U>> exp, U value) 
    { 
     Rules.Add(exp.GetMember().Name, value); 

     return this; 
    } 
}