对象初始化器、集合初始化器、自动属性、匿名类型

 

代码

   
     

    
      
    
       
    
      //
    
      匿名类型，匿名类
 
    
      //
    
      必须初始化不能为null
 
    
      //
    
      仍为强类型，只是由编译器去做了
 
    
      //优
    
      于object,减少了boxing、unboxing
    
      

    
       var i 
    
      =
    
       
    
      10
    
      ;
 Console.WriteLine(i);

 var user 
    
      =
    
       
    
      new
    
       { Name 
    
      =
    
       
    
      "
    
      steve
    
      "
    
      , Age 
    
      =
    
       
    
      10
    
       };
 Console.WriteLine(user.Name 
    
      +
    
       
    
      "
    
       
    
      "
    
       
    
      +
    
       user.Age);

    
      //
    
      自动属性
    
      

    
       
    
      ///
    
       
    
      <summary>
    
      
 
    
      ///
    
       自动属性
 
    
      ///
    
       
    
      </summary>
    
      

    
       
    
      class
    
       Student
 {
 
    
      public
    
       
    
      string
    
       Name
 {
 
    
      get
    
      ;
 
    
      set
    
      ;
 }
 
    
      //
    
      Age为只读属性
    
      

    
       
    
      public
    
       
    
      int
    
       Age
 {
 
    
      get
    
      ;
 
    
      private
    
       
    
      set
    
      ;
 }
 }

    
      //
    
      以上Student类等同于：
    
      

    
       
    
      ///
    
       
    
      <summary>
    
      
 
    
      ///
    
       自动属性
 
    
      ///
    
       
    
      </summary>
    
      

    
       
    
      class
    
       Student
 {
 
    
      private
    
       
    
      string
    
       _name;
 
    
      public
    
       
    
      string
    
       Name
 {
 
    
      get
    
       { 
    
      return
    
       _name; }
 
    
      set
    
       { _name 
    
      =
    
       value; }
 }
 
    
      private
    
       
    
      int
    
       _age;
 
    
      public
    
       
    
      int
    
       Age
 {
 
    
      get
    
       { 
    
      return
    
       _age; }
 
    
      set
    
       { _age 
    
      =
    
       value; }
 }
 
 }
 
    
      //
    
      对象初始化器
    
      

    
       Student zs 
    
      =
    
       
    
      new
    
       Student { Name 
    
      =
    
       
    
      "
    
      steve
    
      "
    
      , Age 
    
      =
    
       
    
      10
    
       };
 Console.WriteLine(zs.Name);
 
    
      //
    
      集合初始化器
    
      

    
       List
    
      <
    
      Student
    
      >
    
       list 
    
      =
    
       
    
      new
    
       List
    
      <
    
      Student
    
      >
    
       { 
    
      new
    
       Student { Name 
    
      =
    
       
    
      "
    
      bob
    
      "
    
      , Age 
    
      =
    
       
    
      11
    
       }, 
    
      new
    
       Student { Name 
    
      =
    
       
    
      "
    
      tom
    
      "
    
      , Age 
    
      =
    
       
    
      12
    
       } };