特性Attribute的简单用法

一、建立一个自定义的Attribute类

注：类名+Attribute，类需要继承Attribute

  

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/// <summary> /// 特性 /// </summary> public class SensitiveFileTypeAttribute : Attribute {     /// <summary>     /// 字段类型     /// </summary>     public SensitiveFileTypeEnum FileType { get; set; }       public SensitiveFileTypeAttribute(SensitiveFileTypeEnum fileType)     {         FileType = fileType;     }   }   /// <summary> /// 字段类型枚举 /// </summary> public enum SensitiveFileTypeEnum {       /// <summary>     /// 单价     /// </summary>     Price = 1,     /// <summary>     /// 金额     /// </summary>     Amount = 2,     /// <summary>     /// 折扣     /// </summary>     Discount = 3   }

　　二、简单在属性上面使用特性：

    属性上面标注特性:[特性名(特性值)]

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public class SaleSoDtlDto     {         /// <summary>         /// 数量         /// </summary>         public int Qty { get; set; }           /// <summary>         /// 折扣         /// </summary>         [SensitiveFileType(SensitiveFileTypeEnum.Discount)]         public decimal Discount { get; set; }                 /// <summary>         /// 未税本币结算价         /// </summary>         [SensitiveFileType(SensitiveFileTypeEnum.Price)]         public decimal SettlementPrice { get; set; }                        /// <summary>         /// 含税本币结算金额         /// </summary>         [SensitiveFileType(SensitiveFileTypeEnum.Amount)]         public decimal TaxSettlementAmount { get; set; }                  }

　　

三、获取某一个类上面有某特性的所有属性：

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/// <summary> /// 导出敏感字段 /// </summary> public static class SensitiveFileAppService {     /// <summary>     /// 使用反射找出某一个类有标记某特性的属性     /// </summary>     /// <typeparam name="T"></typeparam>     public static List<PropertyInfo> GetSensitiveFileList<T>() where T : class, new()     {         List<PropertyInfo> proList = new List<PropertyInfo>();           var properties = typeof(T).GetProperties();         if (properties == null || !properties.Any()) return proList;           foreach (PropertyInfo p in properties)         {             var name = p.Name;//属性名称               var attribute = p.GetCustomAttribute<SensitiveFileTypeAttribute>();             if (attribute == null) continue;  //当前属性是否有SensitiveFileTypeAttribute特性 为NULL就没有此属性               var fileType = attribute.FileType;//特性的FileType属性值               proList.Add(p);           }           return proList;       }   }

　　

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public void TestWay()        {              var proList = SensitiveFileAppService.GetSensitiveFileList<SaleSoDtlDto>();        }