C#通過屬性名字符串獲取、設置對象屬性值



#通過反射獲取對象屬性值並設置屬性值

0、定義一個類

    public class User
    { 
        public int Id { get; set; }
        public string Name { get; set; }
        public string Age { get; set; }
    }

1、通過屬性名(字符串)獲取對象屬性值

   User u = new User();
   u.Name = "lily";
   var propName = "Name";
   var propNameVal = u.GetType().GetProperty(propName).GetValue(u, null);
   
   Console.WriteLine(propNameVal);// "lily"


2、通過屬性名(字符串)設置對象屬性值

   User u = new User();
   u.Name = "lily";
   var propName = "Name";
   var newVal = "MeiMei";
   u.GetType().GetProperty(propName).SetValue(u, newVal);
   
   Console.WriteLine(propNameVal);// "MeiMei"

#獲取對象的所有屬性名稱及類型

  • 通過類的對象實現
   User u = new User();

   foreach (var item in u.GetType().GetProperties())
   {
       Console.WriteLine($"propName:{item.Name},propType:{item.PropertyType.Name}");
   }
   // propName: Id,propType: Int32
   // propName:Name,propType: String
   // propName:Age,propType: String
  • 通過類實現
   foreach (var item in typeof(User).GetProperties())
   {
       Console.WriteLine($"propName:{item.Name},propType:{item.PropertyType.Name}");
   }
   // propName: Id,propType: Int32
   // propName:Name,propType: String
   // propName:Age,propType: String

#判斷對象是否包含某個屬性

   static void Main(string[] args)
   {
       User u = new User();
       bool isContain= ContainProperty(u,"Name");// true
   }


   public static bool ContainProperty( object instance, string propertyName)
   {
       if (instance != null && !string.IsNullOrEmpty(propertyName))
       {
           PropertyInfo _findedPropertyInfo = instance.GetType().GetProperty(propertyName);
           return (_findedPropertyInfo != null);
       }
       return false;
   }
  • 將其封裝為擴展方法
   public static class ExtendLibrary
   {
       /// <summary>
       /// 利用反射來判斷對象是否包含某個屬性
       /// </summary>
       /// <param name="instance">object</param>
       /// <param name="propertyName">需要判斷的屬性</param>
       /// <returns>是否包含</returns>
       public static bool ContainProperty(this object instance, string propertyName)
       {
           if (instance != null && !string.IsNullOrEmpty(propertyName))
           {
               PropertyInfo _findedPropertyInfo = instance.GetType().GetProperty(propertyName);
               return (_findedPropertyInfo != null);
           }
           return false;
       }
   }
   static void Main(string[] args)
   {
       User u = new User();
       bool isContain= u.ContainProperty("Name");// true
   }


免責聲明!

本站轉載的文章為個人學習借鑒使用,本站對版權不負任何法律責任。如果侵犯了您的隱私權益,請聯系本站郵箱yoyou2525@163.com刪除。



 
粵ICP備18138465號   © 2018-2025 CODEPRJ.COM