what is Boxing and Unboxing?

HI,

 Please refer this link:

https://www.c-sharpcorner.com/article/boxing-and-unboxing-in-C-Sharp/ 

Boxing is the process of converting a value type to the type Object or to any interface type implemented by this value type. When the CLR boxes a value type, it wraps the value inside a system. Object instance and stores it on the managed heap. Unboxing extracts the value type from the object. Boxing is implicit; unboxing is explicit. The concept of boxing and unboxing underlies the C# unified view of the type system in which a value of any type can be treated as an object.

 

In the following example, the integer variable is boxed and assigned to object

 

int i = 123; // The following line boxes i. object o = i;

 

The object can then be unboxed and assigned to integer variable

 

o = 123; i = (int)o; // unboxing

Hi kumar,

 

Refer below links,

https://www.c-sharpcorner.com/article/boxing-and-unboxing-in-C-Sharp/

https://www.codeproject.com/Articles/2225/Boxing-and-unboxing-in-C 

Boxing and Unboxing both are used for type conversions.

The process of converting from a value type to a reference type is called boxing. Boxing is an implicit conversion. Here is an example of boxing in C#.

The process of converting from a reference type to a value type is called unboxing. Here is an example of unboxing in C#.

 

Boxing is the process of converting a value type to the type object or to any interface type implemented by this value type. When the CLR boxes a value type, it wraps the value inside a System.Object instance and stores it on the managed heap. Unboxing extracts the value type from the object. Boxing is implicit; unboxing is explicit. The concept of boxing and unboxing underlies the C# unified view of the type system in which a value of any type can be treated as an object.

 

In the following example, the integer variable i is boxed and assigned to object o.

 

int i = 123;

// The following line boxes i.

object o = i;

 

The object o can then be unboxed and assigned to integer variable i:

 

o = 123;

i = (int)o; // unboxing

Boxing – This is the process of converting from value type to reference type.

 

Example -

 

string str = "Test";

object obj = str ; // boxing

 

UnBoxing– It’s completely opposite to boxing. It’s the process of converting reference type to value type.

 

Example -

string str2 = (string)obj;

with an example,

 

Ref. https://www.c-sharpcorner.com/article/boxing-and-unboxing-in-C-Sharp/

 

So, Boxing is the conversion of the value type to an object type whereas, on other hands, the term Unboxing refers to the conversion of the object type to the value type. Here Object type can be any custom class too.

Hi Ankit,

 

i suggest you to read this article and tutorial, explained clearly

https://www.c-sharpcorner.com/UploadFile/ca6c61/concepts-of-C-Sharp-value-type-and-reference-type/

 

https://www.tutorialsteacher.com/csharp/csharp-value-type-and-reference-type 

 

Thanks