Using Nulls in VB.Net

Question

I am calling the OTA API from HP Quality Centre and one of the calls requires sending a NULL.

This is the actual line of code:

stepF.AddItem(NULL)

This works perfectly in VBA and VB6 but VB.NET doesn't accept Nulls. Anyone know how to fix such an issue?

score 5 · Answer 1 · answered Dec 06 '11 at 18:00

5

You need to use Nothing, which is mostly equivalent to null.

answered Dec 06 '11 at 18:00

SLaks

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Unfortunately I'd already tried that and it results in an error stating that "Value does not fall within the expected range". – user1084071 Dec 07 '11 at 09:07

score 2 · Answer 2 · edited May 23 '17 at 12:30

2

Nothing is the Null value for most reference types in VB.Net, I would recommend taking a look at Nullable(Of T) on either MSDN or some good information about it in this SO post, if the API you are using is a .Net web service you may be able to partial class the WSDL and fix although it sounds as though you are not.

edited May 23 '17 at 12:30

Community

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answered Dec 06 '11 at 18:31

Gent

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Actually, it's a COM api, not a web service. – Alex Shnayder Dec 07 '11 at 18:43

score 2 · Answer 3 · answered Dec 07 '11 at 18:45

2

The correct value to use is System.DBNull.Value.

Even if the documentation tells us that this is generally used for database null values, it represent the absence of value, otherwise NULL.

answered Dec 07 '11 at 18:45

Dominic Goulet

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score 1 · Answer 4 · answered Dec 07 '11 at 18:41

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You should use DBNull

answered Dec 07 '11 at 18:41

Alex Shnayder

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Using Nulls in VB.Net

4 Answers4