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

You can use the default keyword to get the default value of any data type:

int x = default(int);        //  == 0
string y = default(string);  //  == null
// etc.

This works with generic parameters as well:

Bar Foo() {
    return new Bar(default(T));
}

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In case you have a variable of type object that may contain null or a value of type int, you can use nullable types and the ?? operator to convert it safely to an integer:

int a = 42;
object z = a;
int b = (int?)z ?? 0;        //  == 42
int c = (int?)null ?? 0;     //  == 0