C# packing and unboxing operation example analysis

This article describes the C# packing and unboxing operations. Share it for your reference, as follows:

1. Packing in C#

Boxing in C# is to implicitly convert a value type to an object type. The conversion process uses a copy of the value instead of a reference., this can be seen from the following example:

using System;
public class Test
{
  public static void Main(String[] args)
  {
    int i = 10;
    //Box the value type i    //It should be noted that the packing here uses a copy of the value    object obj = i;
    //Check whether the packing is successful    if(obj is int)
    {
     ("The data has been boxed!");
    }
    //We're changing the value of i here    i = 33;
    ("int iThe value now is:{0}",i);
    ("int iThe value of the box is:{0}",obj);
  }
}

2. Unboxing in C#

Unboxing in C# is to explicitly convert an object type to a value type，Note: The type to be converted must be compatible with the value type.. As an example:

int i = 10;
object obj = i;
int j = (int)obj;

What you need to note here is:

Boxing and unboxing are very affecting program performance, and packing and unboxing operations should be avoided in the code. Generics can be used to reduce such operations.

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I hope this article will be helpful to everyone's C# programming.