C # Boxing and unboxing operation instance Analysis _c# Tutorial

Source: Internet
Author: User

The examples in this article describe C # Boxing and unboxing operations. Share to everyone for your reference, specific as follows:

1. Boxing in C #

Boxing in C # is an implicit conversion of a value type to type object, using a copy of the value instead of a reference in the conversion process , as can be seen from the following example:

Using System;
public class Test
{public
  static void Main (string[] args)
  {
    int i = ten;
    I boxing the value type
    //NOTE: The boxing here uses a copy of the value of
    object obj = i;
    Verify that the boxing succeeded the
    if (obj is int)
    {
     Console.WriteLine ("Data is boxed!");
    }
    We are here to change the value of I
    =;
    Console.WriteLine ("Int I now value is: {0}", i);
    Console.WriteLine ("Int I boxed value is: {0}", obj);
  }


2. The unboxing in C #

a unboxing in C # is an explicit conversion of an object type to a value type , noting that the type to be converted must be compatible with the value type . Examples are as follows:

int i = ten;
Object obj = i;
int j = (int) obj;

Here's what you need to be aware of:

Boxing and unboxing are very important for program performance, and you should avoid boxing and unboxing operations in your code. You can use generics to reduce such an operation.

Read more about C # Interested readers can view the site topics: "C # form Operation Tips Summary", "C # Common control usage Tutorial", "WinForm Control Usage Summary", "C # Programming Thread Usage Skills summary", "C # Operation Excel Skills Summary", "C # Summary of operational skills in XML files, C # tutorial on data structure and algorithms, C # array operation techniques Summary, and C # Introduction to object-oriented Programming

I hope this article will help you with C # programming.

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