How do I instantiate an object in VB.NET without storing to a variable?

Question

I would like to create an instance of an object and execute a method of the object, but not go through the extra step of storing that instance in a declared variable.

For example, suppose I have a simple Adder class:

public class Adder
{
    private int m_int1;
    private int m_int2;
    public Adder(int int1, int int2)
    {
        this.m_int1 = int1;
        this.m_int2 = int2;
    }
    public int getSum()
    {
        return m_int1 + m_int2;
    }
}

I can of course create an instance, store in a variable, and use it:

Adder a = new Adder(1, 2);
int rslt = a.getSum();
// rslt = 3

However, in C#, I can skip the variable storage step, and just call the method on the result of the instantiation:

int rslt = new Adder(1, 2).getSum();
// rslt = 3

I can't seem to do the same in VB.NET, however. A statement like:

New Adder(1, 2)

is considered a syntax error unless the result is stored in a variable.

The workaround would be to create a static "Create" method in the class that returns a new instance of the class, but I was wondering if there is a VB.NET equivalent to what's possible in C#.

Did you try Dim result as Int32 = (New Adder(1, 2)).getSum()? (which is what you were doing in your c# example) — Seth Moore
– Seth Moore, Commented Oct 10, 2013 at 17:18

Karl Anderson · Accepted Answer · 2013-10-10 17:19:04Z

10

Try this:

Dim rslt As Integer = New Adder(1, 2).getSum()

answered Oct 10, 2013 at 17:19

Karl Anderson

34.9k12 gold badges69 silver badges83 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user2868053 Over a year ago

Ah, yes, you're right. I had run into the problem and done some initial tests based on a non-returning object method (sub). I had assumed that because the non-returning case didn't work, the returning case wouldn't either. New MyObject().DoSomethingNoReturn() doesn't work, but Dim rslt = New MyObject().DoSomethingWithReturn() does.

Collectives™ on Stack Overflow

How do I instantiate an object in VB.NET without storing to a variable?

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related