Hello -

I realize that there is no more IsMissing function in VB.NET but how
can I have a boolean argument that is optional and in the code I need
to determine whether it was passed it or not?

I use the Single.NaN to set the default values for some of my optional
single arguments so that I can determine whether an argument was passed
it ... but that does not work for booleans.

Any suggestions?

Thanks!
Joe

Are you working with checkboxes?

If you are you can use a threestate property - it would put it to
checked, unchecked or indeterminate...

http://msdn2.microsoft.com/en-US/library/system.windows.forms.checkbox.threestate.aspx

Hello Melissa -

Thanks for you response.  I am not dealing with checkboxes but that is
something I should look into.

Thanks!
Joe

Joe,
In the case of needing "missing" value types (Single, Integer, Boolean) I
normally overload the method instead of using optional parameters.

    Public Sub Something()
        ' Boolean parameter not passed
    End Sub

    Public Sub Something(flag As Boolean)
        ' Boolean parameter was passed
    End Sub

Depending on how the extra parameter is used, I may call the first from the
second or visa versa.

I reserve Optional parameter when I have a clear default value.

    Public Sub SetDirty(Optional flag As Boolean = True)
        ' defaults to setting Dirty to true
    End Sub

        SetDirty() ' set the object to dirty

        SetDirty(False) ' the object is now clean...

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Hello Jay -

Thanks for the input ... I guess that is probably the best way to go.

Joe

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