How to handle null objects in string concatenations in VB.NET?

Question

Dim response As MyClass = obj.ProcessRequest(strRequest)
Msgbox("This is the response message: " & response.Message)

If there is a problem in the ProcessRequest method and it returns null, then the next line will not work and a NullReference exception will be thrown.

What is the easiest way to have response.Message evaluate to an empty string if response is null?

gzaxx · Accepted Answer · 2013-11-19 07:54:07Z

2

You may use inline If:

Msgbox("This is the response message: " & If(response Is Nothing, "", response.Message))

but IMO it is more readable to use if .. else clause

answered Nov 19, 2013 at 7:54

gzaxx

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Solocle · Accepted Answer · 2021-02-11 11:52:59Z

0

& Nothing equates to & "".

So the neatest way IMO is:

Dim response As MyClass = obj.ProcessRequest(strRequest)
Msgbox("This is the response message: " & response?.Message)

answered Feb 11, 2021 at 11:52

Solocle

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