.Net特性(attribute)相关

 1  [AttributeUsage(AttributeTargets.Method|AttributeTargets.Class)]//表示可以标注在类和方法上面
 2       public class YZMColumnAttribute : Attribute
 3       {
 4   
 5          private string _Name = null;
 6          public YZMColumnAttribute(string name)
 7           {
 8               this._Name = name;
 9           }
10          public string GetYZMColumnName()
11          {
12             return this._Name;
13          }
14  
15      }

 1  public static  bool ValiData<T>(this T t)
 2         {
 3             Type type = t.GetType();
 4 
 5             foreach (var prop in type.GetProperties())//遍历获取方法内所用的属性成员
 6             {
 7                 if (prop.IsDefined(typeof(ModelReAttribute), true))//判断属性成员中是否有此特性包括继承过来的特性
 8                 {
 9                     object value = prop.GetValue(t);
10                     foreach (ModelReAttribute attribute in prop.GetCustomAttributes(typeof(ModelReAttribute),true))//实例特性
11                     {
12                         if (!(attribute.ValiData(value)))//获取特性中的值
13                         {
14                             return false;
15                         }
16                     }
17                 }
18                 //获取特性中的名称
19                 if (prop.IsDefined(typeof(YZMColumnAttribute), true))
20                 {
21                     object value = prop.GetValue(t);
22                     foreach (YZMColumnAttribute attribute in prop.GetCustomAttributes(typeof(YZMColumnAttribute), true))
23                     {
24                         var s = attribute.GetYZMColumnName();
25                         
26                             return false;
27                     }
28                 }
29             }
30             return true;
31         }

 1 namespace YZMFramework.ValiData
 2 {
 3    public  abstract class ModelReAttribute:Attribute
 4     {
 5         public abstract bool ValiData(object obj);
 6     }
 7 }
 8 
 9 
10  public class YZMRequiredattribute: ModelReAttribute//继承
11     {
12         public override bool ValiData(object obj)
13         {
14             if (string.IsNullOrWhiteSpace(obj.ToString()))
15             {
16                 return false;
17             }
18             else {
19                 return true;
20             }
21         }
22     }
23 
24 
25    public    class YZMLongAttribute : ValiData.ModelReAttribute//继承
26     {
27         private long _Max = 0;
28         private long _Min = 0;
29         public YZMLongAttribute(long Min, long Max)
30         {  
31             this._Min = Min;
32             this._Max = Max;
33         }
34         public  override  bool  ValiData( object obj)
35         {
36             if (
37                 string.IsNullOrWhiteSpace(obj.ToString())
38                 && long.TryParse(obj.ToString(),out long OValues)
39                 && OValues>= this._Max
40                 && OValues < this._Min
41                 )
42             {
43                 return false;
44 
45             }
46             return true;
47         }
48     }
49 
50 
51 
52 
53     foreach (var prop in type.GetProperties())
54             {
55                 if (prop.IsDefined(typeof(ModelReAttribute), true))//遍历父类就OK,继承必须为True
56                 {
57                     object value = prop.GetValue(t);
58                     foreach (ModelReAttribute attribute in prop.GetCustomAttributes(typeof(ModelReAttribute),true))
59                     {
60                         if (!(attribute.ValiData(value)))
61                         {
62                             return false;
63                         }
64                     }
65                 }