Constructing an object and calling a method without assignment in VB.Net

Question

I'm not entirely sure what to call what C# does, so I haven't had any luck searching for the VB.Net equivalent syntax (if it exists, which I suspect it probably doesn't).

In c#, you can do this:

public void DoSomething() {
    new MyHelper().DoIt(); // works just fine
}

But as far as I can tell, in VB.Net, you must assign the helper object to a local variable or you just get a syntax error:

Public Sub DoSomething()
    New MyHelper().DoIt() ' won't compile
End Sub

Just one of those curiosity things I run into from day to day working on mixed language projects - often there is a VB.Net equivalent which uses less than obvious syntax. Anyone?

Gideon Engelberth · Accepted Answer · 2010-04-15 23:50:35Z

6

The magic word here is Call.

Public Sub DoSomething()
    Call (New MyHelper()).DoIt()
    Call New MyHelper().DoIt()
End Sub

answered Apr 15, 2010 at 23:50

Gideon Engelberth

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1 Comment

M.A. Hanin Over a year ago

It is magical! Nice for showing both options (with and without parentheses). +1

M.A. Hanin · Accepted Answer · 2010-04-16 00:39:27Z

2

Gideon Engelberth is right about using Call. It is the best option.

Another option is to use a With statement:

With New MyHelper()
    .DoIt()
End With

answered Apr 16, 2010 at 0:39

M.A. Hanin

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1 Comment

yu_ominae Over a year ago

This is actually the option you should go for it you are calling several methods on your object, for example if you use a SaveFileDialog which you are only interested in showing and collection values from, but don't need long term.

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