How do I debug ASP.NET Core 1.1 applications in Visual Studio 2015?

I updated .NET Core 1.0.1 to .NET Core 1.1.0, and am no longer able to ‘Start Debugging’ (F5) from Visual Studio 2015.

When I tried to debug, I’d get the following error in the output console in Visual Studio:

The program '[6316] dotnet.exe' has exited with code -2147450751 (0x80008081).
The program '[4612] iisexpress.exe' has exited with code 0 (0x0).

The latest version of .NET Core is 1.1 (1.1.0 if you’re a package manager type), but Visual Studio 2015 only supports F5 Debugging with .NET Core 1.0.1.

You can still debug .NET Core 1.1.0 Applications in Visual Studio 2015, however. Here’s how:

Open the Package Manager Console (or use cmd.exe).

Type dotnet run from either console.
You should see the following prompt:

netcorerun

Go to the debug menu in Visual Studio and click “Attach to Process” (or use the Ctrl+Alt+P shortcut).

attachtoprocessLook for dotnet.exe, and hold down shift while selecting all the dotnet.exe processes (it’s one of those three; and you can actually select all at the same time).

Click the “Attach” button.

You’ll know you’re debugging because set breakpoints will change from clear interiors to a red interior (indicating the breakpoints have been loaded).

Happy Debugging!

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