我可以用StringLengthAttribute以編程方式測試一個屬性來檢查它是否有效嗎？

Question

考慮到我有：

[StringLength(10)] 
public string Bibble {get; set;} 

我可以單獨檢查，看看是否比博是有效的？

我認爲：

PropertyInfo[] props = typeof(MyBibbleObject).GetProperties(); 
foreach (PropertyInfo prop in props) 
{ 
    object[] attrs = prop.GetCustomAttributes(true); 
    foreach (object attr in attrs) 
    { 
     StringLengthAttribute stringLengthAttribute = attr as StringLengthAttribute; 
     if (stringLengthAttribute != null) 
     { 
      string propName = prop.Name; 

// Could be IsValid? 
      stringLengthAttribute.IsValid() 


     } 
    } 
} 

但是IsValid的方法需要一個對象，我沒想到。我想知道是否有更好的方法來確定它是否有效。我必須在每個物業的基礎上做。

Answer 1

您可以使用內置的Validator類。它的用法有些模糊，但仍然如下：

// instance is your MyBibbleObject object 
var ctx = new ValidationContext(instance); 
// property to validate 
ctx.MemberName = "Bibble"; 
// this will store results of validation. If empty - all fine 
var results = new List<ValidationResult>(); 
// pass value to validate (it won't take it from your object) 
Validator.TryValidateProperty(instance.Bibble, ctx, results);