c# - 获取属性的参数和值

Question

您好，我正在使用反射来迭代此模型的属性的属性:

[Required(ErrorMessage = "Username is required")]
[MaxLength(50, ErrorMessage = "Username should not have more then 50 chars")]
[MinLength(25 , ErrorMessage = "Username should have at least 25 chars")]
 public string UserName { get; set; }

 [Required(ErrorMessage = "Password is required")]
 [StringLength(25)]
 public string Password { get; set; }

 public bool RememberMe { get; set; }

foreach (var propertyInfo in type)
       var attr = propertyInfo.CustomAttributes;
       foreach (var customAttributeData in attr)
       {
             var name = customAttributeData.AttributeType.Name;
       }
}

我设法获取了属性名称，但在获取属性构造函数参数的键/值对时遇到了麻烦。

我如何才能访问属性的构造函数参数和值？

一个示例是能够从必需属性 ErrorMessage.Name 和 ErrorMessage.Value 获取:

Answer 1

您可以使用MemberInfo.Name 和TypedValue.Value。这是代码:

foreach (var propertyInfo in typeof(YOUR CLASS).GetProperties())
{
    var attr = propertyInfo.GetCustomAttributesData();

    foreach (var customAttributeData in attr)
    {
        foreach (var item in customAttributeData.NamedArguments)
        {
            var name = item.MemberInfo.Name;
            var value = item.TypedValue.Value;
        }
    }
}