获取属性的参数和值
本文关键字:参数 属性 获取 | 更新日期: 2023-09-27 18:18:49
嗨,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;
}
}
我设法获得属性名称,但我在获取属性构造函数参数的键/值对时遇到麻烦。
我如何能够访问例如属性和值的构造函数参数?
一个例子是能够从Required属性ErrorMessage获取:名称和ErrorMessage。值
可以使用MemberInfo.Name
和TypedValue.Value
。下面是代码:
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;
}
}
}
您需要进一步使用反射,对每个属性使用Type.GetProperties
,然后使用PropertyInfo.GetValue
提取每个属性公开暴露的属性值。
尝试一次查找一种类型的属性:
foreach (var reqAttr in (RequiredAttribute[])propertyInfo.GetCustomAttributes(typeof(RequiredAttribute), false))
{
// use reqAttr.ErrorMessage and so on, in here
}