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Yes, I know that this question arises from time to time, I have searched for answer on internet, but nothing seems to work right. So I prepared I detailed explanation, accompanied by screenshots, on what I tried to do to be able to follow code execution throught .NET Core source code and what was the result.

I'm using Visual Studio Community 16.8.3, and have created a .NET Core 3.1 web app from template. I changed the code in Startup class to make it crash.

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These are my debug settings (I have no idea weather .NET Framework source stepping has any significance for .NET Core projects):

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So lets run and hit an exception:

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Here I'll choose just to decomplie the source code (there's a link for it on the previous image), to see if this works:

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OK, but I just see the code, can't examine variable and object values. Let's rerun and see if I can get the code by clicking on the symbol server when the exception hits:

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It complains, so let's enable source servers.

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Lets run it again, and hit the exception.

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Now it complains on some kind of exclusion (see symbol status column):

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I load all the symbold manually:

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Here I rerun the app, with all the symbols loaded, but when the exception hits I still can't F11 into the .NET Core source:

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What am I missing to be able to step throught the .NET Core source code?

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3
  • "Enable .Net Framework source stepping"? Commented Dec 28, 2020 at 14:46
  • I'm using .NET Core, not .NET Framework. Anyway, I tried that option too, but everything stays the same. Commented Dec 28, 2020 at 18:58
  • This shows you how to debug ASP.NET Core source code: levelup.gitconnected.com/… Commented Nov 11, 2021 at 3:44

2 Answers 2

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Did you enable Source Link? I was able to step into the .NET Core 3.1 source code after doing the following:

  • Uncheck "Enable Just My Code" and check "Enable Source Link support" in Tools -> Options -> Debugging -> General enter image description here

  • Activate the symbol servers in Tools -> Options -> Debugging -> Symbols enter image description here

I got this information from Improving Debug-time Productivity with Source Link on Microsoft Devblogs.

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The exception says that public method Configure is missing in Startup class. The application did not start properly and that is why debugging does not work.

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2 Comments

The application hit an exception in the .NET Core source sode. I want to see the point where the exception was hit, to examine the context in which it happened. I myself created the situation where the exception would arise, this is just a simplified example of a situation which might arise in a real system.
You can step into .NET Core source code by enabling Source Link support (I added an answer to describe it in more detail).

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