Question

I have code that is similar to this:

public xyz (int? a)
{
  if (a.HasValue)
  { 
    // here DoSomething has parameters like DoSomething(int x)
    blah = DoSomething(a);

I am getting the error (cannot convert from int? to int). Is there a way I can pass the variable ‘a’ to my function without having to do DoSomething(int? x)?

Answer 1

Use the Value property of the nullable variable:

public xyz (int? a) {
  if (a.HasValue) { 
    blah = DoSomething(a.Value);
    ...

The GetValueOrDefault method might also be useful in some situations:

x = a.GetValueOrDefault(42);  // returns 42 for null

or

y = a.GetValueOrDefault(); // returns 0 for null