Boxing Occurrence in C#

Question

I\'m trying to collect all of the situations in which boxing occurs in C#:

• Converting value type to System.Object type:

  struct          
  
  
          

Answer 1

Mentioned in Motti's answer, just illustrating with code samples:

Parameters involved

public void Bla(object obj)
{

}

Bla(valueType)

public void Bla(IBla i) //where IBla is interface
{

}

Bla(valueType)

But this is safe:

public void Bla(T obj) where T : IBla
{

}

Bla(valueType)

Return type

public object Bla()
{
    return 1;
}

public IBla Bla() //IBla is an interface that 1 inherits
{
    return 1;
}

Checking unconstrained T against null

public void Bla(T obj)
{
    if (obj == null) //boxes.
}

Use of dynamic

dynamic x = 42; (boxes)

Another one

enumValue.HasFlag