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      • c#教程之C#的數據類型

      • 2015-01-21 16:16 來源:未知

      1.2       C#的數據類型(相關C#教程)
      從大的方面來分,C#語言的數據類型可以分為三種:值類型,引用類型,指針類型,指針類型僅用于非安全代碼中。本節重點討論值類型和引用類型。

      1.4.1 值類型和引用類型區別

      C#語言中,值類型變量存儲的是數據類型所代表的實際數據,值類型變量的值(或實例)存儲在棧(Stack)中,賦值語句是傳遞變量的值。引用類型(例如類就是引用類型)的實例,也叫對象,不存在棧中,而存儲在可管理堆(Managed Heap)中,堆實際上是計算機系統中的空閑內存。引用類型變量的值存儲在棧(Stack)中,但存儲的不是引用類型對象,而是存儲引用類型對象的引用,即地址,和指針所代表的地址不同,引用所代表的地址不能被修改,也不能轉換為其它類型地址,它是引用型變量,只能引用指定類對象,引用類型變量賦值語句是傳遞對象的地址。見下例:
      using System;
      class MyClass//類為引用類型
      {  public int a=0;
      }
      class Test
      {  static void Main()
      {  f1();
      }
      static public void f1()
      {  int v1=1;//值類型變量v1,其值1存儲在棧(Stack)
      int v2=v1;//v1的值(1)傳遞給v2v2=1,v1值不變。
      v2=2;//v2=2,v1值不變。
      MyClass r1=new MyClass();//引用變量r1存儲MyClass類對象的地址
      MyClass r2=r1;//r1和r2都代表是同一個MyClass類對象
      r2.a=2;//和語句r1.a=2等價
      }
      }
      存儲在棧中的變量,當其生命周期結束,自動被撤銷,例如,v1存儲在棧中,v1和函數f1同生命周期,退出函數f1,v1不存在了。但在堆中的對象不能自動被撤銷。因此C和C++語言,在堆中建立的對象,不使用時必須用語句釋放對象占用的存儲空間。.NET系統CLR內建垃圾收集器,當對象的引用變量被撤銷,表示對象的生命周期結束,垃圾收集器負責收回不被使用的對象占用的存儲空間。例如,上例中引用變量r1及r2是MyClass類對象的引用,存儲在棧中,退出函數f1,r1和r2都不存在了,在堆中的MyClass類對象也就被垃圾收集器撤銷。也就是說,CLR具有自動內存管理功能。
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