Boxing and unboxing

Hi Avinash Venkat,

Boxing:

Boxing considered as the implicit conversion of value type to object or reference type.

Unboxing:

It is the opposite of Boxing, the explicit conversion of reference type to value type.

Example 1:

int Value = 12; // int 12 will assigned to num
object Boxed = Value; // Boxing
int UnBoxed = (int) Boxed; // Unboxing

Example 2: Boxing & UnBoxing in C# Array list

int a = 5;
ArrayList arr = new ArrayList();
arr.Add(a);// Boxing
int b = (int)arr[0];// UnBoxing

Example 3:

3.1 Boxing

using System;
class Boxing {
static public void Main() // Main Method
{
// assigned int value
// 200 to Value
int Value = 200;
object obj = Value; // boxing
Value = 100; // Value to be change
System.Console.WriteLine
("Value - type of Value is : {0}", Value);
System.Console.WriteLine
("Object - type of obj is : {0}", obj);
}
}

Output
Value- type of Value is : 100
Object-type of obj is: 200

3.2 UnBoxing

static public void Main() // Main Method
{
// assigned int value
// 53 to num
int num = 53;
object obj = num; // boxing
int i = (int)obj; // unboxing
// Display result
Console.WriteLine("Value of ob object is : " + obj);
Console.WriteLine("Value of i is : " + i);
}
}

Output:
Value of ob object is : 53
Value of i is : 53

Refereces:

https://www.c-sharpcorner.com/article/boxing-and-unboxing-in-C-Sharp/
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/types/boxing-and-unboxing
https://www.tutorialspoint.com/Boxing-and-Unboxing-in-Chash

3 Replies

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Mageshwaran R6y ago
Hi,
Please refer the below link, it might helps you
https://www.geeksforgeeks.org/c-sharp-boxing-unboxing/
Elavarasan R7y ago
Hi Avinash Venkat,

Boxing:
Boxing considered as the implicit conversion of value type to object or reference type.

Unboxing:
It is the opposite of Boxing, the explicit conversion of reference type to value type.
Example 1:
int Value = 12; // int 12 will assigned to num

object Boxed = Value; // Boxing

int UnBoxed = (int) Boxed; // Unboxing
Example 2: Boxing & UnBoxing in C# Array list
int a = 5;
ArrayList arr = new ArrayList();

arr.Add(a);// Boxing

int b = (int)arr[0];// UnBoxing
Example 3:
3.1 Boxing
using System;
class Boxing {

    static public void Main() // Main Method
    {

        // assigned int value
        // 200 to Value
        int Value = 200;

        object obj = Value; // boxing

        Value = 100; // Value to be change

        System.Console.WriteLine
        ("Value - type of Value is : {0}", Value);
        System.Console.WriteLine
        ("Object - type of obj is : {0}", obj);
    }
}
Output
Value- type of Value is : 100
Object-type of obj is: 200

3.2 UnBoxing
static public void Main() // Main Method
    {
        // assigned int value
        // 53 to num
        int num = 53;

        object obj = num; // boxing

        int i = (int)obj;  // unboxing

        // Display result
        Console.WriteLine("Value of ob object is : " + obj);
        Console.WriteLine("Value of i is : " + i);
    }
}
Output:
Value of ob object is : 53
Value of i is : 53
Refereces:
https://www.c-sharpcorner.com/article/boxing-and-unboxing-in-C-Sharp/
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/types/boxing-and-unboxing
https://www.tutorialspoint.com/Boxing-and-Unboxing-in-Chash
Chittaranjan Swain7y ago
Hi avinash,

Refer below links,
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/types/boxing-and-unboxing
https://www.c-sharpcorner.com/interview-question/what-is-the-real-use-of-boxing-and-unboxing
https://www.dotnettricks.com/learn/csharp/understanding-boxing-and-unboxing-in-csharp
https://www.codeproject.com/Articles/2225/Boxing-and-unboxing-in-C