In visual studio 2019, how do I set a conditional breakpoint that calls math.abs()?

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The title of the question pretty much says it all: in Visual Studio 2019, how do I set a conditional breakpoint that calls Math.Abs()?

Eg. Math.Abs( x ) > 0

What I have tried:

I have tried prefixing the call, like this: System.Math.Abs( x ) > 0

I've also tried searching for an answer but came up blank. Oddly, I could find how to call a C++ stdlib function (like strcmp) but nothing for C#.

Posted 2-Aug-20 22:01pm

Patrick Skelton

Updated 2-Aug-20 22:14pm

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2 solutions

Solution 2

You cannot debug the predefined methods.The other ways to see the output values is by using quickwatch or assign to variable and check the condition.

Posted 2-Aug-20 22:14pm

Member 14885087

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OriginalGriff 3-Aug-20 4:22am

Um ... are you sure? Conditional breakpoints using "internal functions" works fine for me ...

Member 14885087 3-Aug-20 4:50am

I have tried this and works for me
int testInit = 1;
for (int i = 0; i < 100; i++)
{
if(Math.Abs(i)> 3)
{
Console.WriteLine("Test");
}
Console.WriteLine(i);
}
I put conditional break point for Math.Abs(i)> 3 with conditional expression 'i==5' and the bp has worked for me

OriginalGriff 3-Aug-20 4:25am

Oh, and just in case you misunderstood the original question - you can debug into "predefined methods" including framework library ones quite easily (and it can be very handy):
https://docs.microsoft.com/en-us/visualstudio/debugger/how-to-debug-dotnet-framework-source?view=vs-2019

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OriginalGriff · Accepted Answer · 2020-08-02T22:13:00

Solution 1

Does this help: Use breakpoints in the debugger - Visual Studio | Microsoft Docs[^] - it has a section on conditional breakpoints.

I tried it with a BP on the Console line:

for (int i = 0; i < 100; i++)
    {
    Console.WriteLine(i);
    }

I set a BP, then right clicked and selected "Conditions..."
Leaving "Conditional Expression", and "is true", in the expression box I typed "Math.Abs(i) == 5" and closed.
The breakpoint triggered only on the sixth iteration.

Posted 2-Aug-20 22:13pm

OriginalGriff

Updated 2-Aug-20 22:20pm

v3

Comments

Patrick Skelton 3-Aug-20 4:39am

Mmm... that's strange. It does indeed work fine now. I guess I must have had a syntax error or something. I'll leave the question up because it may provide a nice quick answer for anyone else who may come along. Thank you.

OriginalGriff 3-Aug-20 4:49am

You're welcome!

It failed for me the first time as well - I used the English spelling of "Maths" instead of the American "Math" :blush: