UWP c# crashes with no debug output-CodePudding

I just downloaded UWP/.NET to run some project I found of github.

private void onl oaded(object sender, RoutedEventArgs e)
{
    var button = null as Button;
    var b = button.CommandParameter;
    //throw new InvalidOperationException("Testing");
}

Throwing the exception breaks the program as expected. However, the null access crashes the app and the only debug output message I get is

The program '[12036] eReader.exe' has exited with code 2148734499 (0x80131623).

According to hresult.info 0x80131623 is Runtime operation halted by call to System.Environment.FailFast().

However, the original error that was crashing the app from a call to StorageFile.CopyAsync has now gone away, so I can no longer test the debugging configuration.

CodePudding user response：

The debugger now breaks on the null access. I've done nothing at all apart from recompiling minor changes and rerunning.

Just try again until it works?

Edit: actually it might have been moving the error from an async method to a synchronous method. Maybe visual studio needs to have an error in a synchronous method before it can handle errors in async methods.

Edit 2: perhaps it's because I tried to build before having .NET and UWP installed. I stopped the after the build was non-responsive and installed, but perhaps there were some complications.