c# 抽象类+特性 验证QQ,Mobile,Name的通用写法

1. 调用 bool bResult = ValidateAttributeExtension.Validate<StudentVip>(vip);
 [Custom]
    public class StudentVip : Student
    {
        [Custom]
        public string Description;        //[Custom]
        [QQAttribute(_MinLenth = 5, _MaxLenth = 12)]
        public string QQ { [Custom(456, "Ricahrd")][Custom(567, "Ricahrd1")][Custom(789, "Ricahrd2")] get; set; }        [MobileNumAtrribute(11)]
        public long MobileNum { get; set; }
    } 
2.特性的额外方法：验证功能：
public class ValidateAttributeExtension
    {
        public static bool Validate<T>(T t)
        { 
            Type type = t.GetType();
            foreach (PropertyInfo prop in type.GetProperties())
            {
                ///验证手机号长度
                //if (prop.IsDefined(typeof(MobileNumAtrribute), true))
                //{
                //    object oValue = prop.GetValue(t); 
                //    MobileNumAtrribute atrribute = prop.GetCustomAttribute<MobileNumAtrribute>(true);
                //    if (!atrribute.Validate(oValue))
                //    {
                //        return false;
                //    } 
                //} 
                /////这就是验证QQ
                //if (prop.IsDefined(typeof(QQAttribute), true))
                //{
                //    object oValue = prop.GetValue(t);
                //    QQAttribute atrribute = prop.GetCustomAttribute<QQAttribute>(true);
                //    if (!atrribute.Validate(oValue))
                //    {
                //        return false;
                //    } 
                //} 
                //如果后续还需要再加一个验证呢？那岂不是 又要修改代码？
                //这样做是坑，抽象~~ 
                if (prop.IsDefined(typeof(AbstractValidateAttribute), true))
                {
                    object oValue = prop.GetValue(t);
                    AbstractValidateAttribute atrribute = prop.GetCustomAttribute<AbstractValidateAttribute>(true);
                    if (!atrribute.Validate(oValue))
                    {
                        return false;
                    }
                }            }
            return true;
        }
    } 
3.验证QQ的特性继承抽象类+验证QQ的长度
public class QQAttribute: AbstractValidateAttribute
{
public int _MinLenth; 
public int _MaxLenth;public override bool Validate(object mobileNum)
{
return mobileNum != null && mobileNum.ToString().Length >= _MinLenth && mobileNum.ToString().Length <= _MaxLenth;//if (mobileNum!=null&& mobileNum.ToString().Length>= _MinLenth && mobileNum.ToString().Length<= _MaxLenth)
//{
// return true;
//}
//return false;
}
} 
4.抽象类继承特性
public abstract class AbstractValidateAttribute : Attribute
{
public abstract bool Validate(object value);
} 
----------------------------------------------------------- 特性应用 -status 枚举 enum------------------------------------------
0.调用
var normal = UserStuta.Normal;
var frozen = UserStuta.Frozen;
string strnormal = RemarkExtension.GetRemark(normal); //获取枚举描述
string strfrozen = RemarkExtension.GetRemark(frozen); 
1.remark 扩展
public static class RemarkExtension
{
public static string GetRemark(this Enum @enum) //扩展方法
{
Type type = @enum.GetType();
FieldInfo? fileInfo = type.GetField(@enum.ToString());
if (fileInfo != null)
{
if (fileInfo.IsDefined(typeof(RemarkAttribute), true))
{
RemarkAttribute remarkAttribute = (RemarkAttribute)fileInfo.GetCustomAttribute(typeof(RemarkAttribute), true);
return remarkAttribute.Remark;
}
}
return @enum.ToString();
}
} 
2.remark特性
[AttributeUsage(AttributeTargets.Field)]
public class RemarkAttribute : Attribute
{
public string Remark { get; private set; }public RemarkAttribute(string remark)
{
this.Remark = remark;
}
}