C# |装箱拆箱
前提条件:c# 中的数据类型
拳击和拆箱是【c#中的一个重要概念。C# Type 系统包含 三种数据类型 : 值类型(int、char 等)、引用类型(object) 和指针类型。基本上，它将值类型转换为引用类型，反之亦然。装箱和取消装箱实现了类型系统的统一视图，其中任何类型的值都可以被视为对象。
c# 打拳
- 转换一个 值类型(字符，整型等)的过程。)到一个参考型(物体)叫做拳。
- 装箱是使用对象类型(超类型)的隐式转换过程。
- 值类型始终存储在堆栈中。引用的类型存储在堆中。
-
例:
```cs int num = 23; // 23 will assigned to num Object Obj = num; // Boxing
```
-
Description : First declare a value type variable (num), which is integer type and assigned it with value 23. Now create a references object type (obj) and applied Explicit operation which results in num value type to be copied and stored in object reference type obj as shown in below figure :
![Boxing]()
-
让我们用 C# 编程代码来理解拳击:
```cs // C# implementation to demonstrate // the Boxing using System; class GFG {
// Main Method static public void Main() {
// assigned int value // 2020 to num int num = 2020;
// boxing object obj = num;
// value of num to be change num = 100;
System.Console.WriteLine ("Value - type value of num is : {0}", num); System.Console.WriteLine ("Object - type value of obj is : {0}", obj); } } ```
输出:
```cs Value - type value of num is : 100 Object - type value of obj is : 2020
```
在 C# 中脱氧
- 将 参考类型转换为值类型 的过程称为拆箱。
- 它是显式的转换过程。
-
例:
```cs int num = 23; // value type is int and assigned value 23 Object Obj = num; // Boxing int i = (int)Obj; // Unboxing
```
-
Description : Declaration a value type variable (num), which is integer type and assigned with integer value 23. Now, create a reference object type (obj).The explicit operation for boxing create an value type integer i and applied casting method. Then the referenced type residing on Heap is copy to stack as shown in below figure :
![Unboxing]()
-
让我们来理解用 C# 编程代码打开的锁:
```cs // C# implementation to demonstrate // the Unboxing using System; class GFG {
// Main Method static public void Main() {
// assigned int value // 23 to num int num = 23;
// boxing object obj = num;
// unboxing int i = (int)obj;
// Display result Console.WriteLine("Value of ob object is : " + obj); Console.WriteLine("Value of i is : " + i); } } ```
输出:
```cs Value of ob object is : 23 Value of i is : 23
```
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