Conditional Breakpoints in Visual Studio 2012

Question

In a relatively large VB.NET application, I have the following code.

code

The code sits within a for loop that runs for every given service object. I want a conditional break point that will only activate when objService.VehLastMile is Nothing.

So I right-click my break point and add a condition, here it is:

condition

But this does not work! my break point is not hit! what am I doing wrong?

Any help would be great.

Thank You.

`Is Nothing`, not `= Nothing`. – GSerg Aug 15 '14 at 07:17 — GSerg, Aug 15 '14 at 07:17
Thanks that was it, please reply as Answer! ^_^ – J86 Aug 15 '14 at 07:20 — J86, Aug 15 '14 at 07:20

score 2 · Accepted Answer · answered Aug 15 '14 at 07:23

2

The = operator doesn't work for a value of nothing in VB.NET

You should either use the Is operator:

objService.VehLastMile Is Nothing

Or IsNothing function:

IsNothing(objService.VehLastMile)

answered Aug 15 '14 at 07:23

Alireza

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score 0 · Answer 2 · edited May 23 '17 at 12:05

0

Just like when you are coding, if you want to compare a reference type to Null (Nothing) you have to use Is so your condition should be:

objService.VehLastMile Is Nothing

You can compare value types to nothing using the equals sign, but this is effectively the same as comparing it to [Type].MinValue

See What is the difference between a reference type and value type in c#?

edited May 23 '17 at 12:05

Community

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answered Aug 15 '14 at 07:49

Matt Wilko

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Conditional Breakpoints in Visual Studio 2012

2 Answers2