I want “(int)null” to return me 0

Question

How can i get 0 as integer value from (int)null.

EDIT 1: I want to create a function that will return me default values for null representa

Answer 1

A generic method that returns a cast instance of an object or the default value could be implemented as follows:

static T Cast(object value) {
    if (value is T)
        return (T)value;
    else
        return default(T);
}

This way, using a valid value will yield the value itself:

int value = Cast(4); //value = 4

and a null value will get the default:

int value = Cast(null); //value = 0

Notice that since the method takes object as an argument, this will cause boxing when used with struct objects (like int).