Question

I’m trying to implement a class that stores a generic nullable type:

public class myclass<T?>
{
    T? myvariable;

    public T? myfunction(){
        return myvariable;
    }
 }

And while the above class compiles just fine, the actual use that provides trouble:

myclass<int?> c = new myclass<int>();
int? = c.myfunction();   // does not work: implicit cast from type T? in int? not possible.
// or, assuming the variable is not null
int = c.myfunction().Value; // implicit cast from type T in int not possible.

What am I doing wrong or how can I work around this?

Answer 1

Neither of the examples compile:

• <T?> isn’t valid syntax; it should be <T>
• myclass needs a where T : struct constraint
• The first line of your second example should read: myclass<int> c = new myclass<int>();.

The rest of your second example should compile OK, however.