Unboxing doubt

Megha Singhal

Please suggest..

which among the following are unboxing example:

enum E={"Hello World"};

void sample(System.Enum et)
{
E e = (E) et;
}

OR

class C = {public int Value{get;set;}}

void sample1(C ct)
{
int i = ct.Value;
}

2 Replies

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Jignesh Trivedi14y ago
hi,

Unboxing is an explicit conversion from the type object to a value type or from an interface type to a value type that implements the interface. An unboxing operation consists of:
- Checking the object instance to make sure it is a boxed value of the given value type.
- Copying the value from the instance into the value-type variable.
int i = 123;          // A value type
object box = i;       // Boxing
int j = (int)box;     // Unboxing

here enum is value type
refer http://msdn.microsoft.com/en-us/library/s1ax56ch%28v=vs.80%29.aspx
so there is no unboxing.
hope this help.
Alok Uniyal14y ago
enum E={"Hello World"}; void sample(System.Enum et) { E e = (E) et; } it is example of unboxing. An unboxing conversion permits a reference-type to be explicitly converted to a value-type. From the type System.Enum to any enum-type is unboxing.