Runtime: Adding ApplicationException and other some other exception types

[manu-st]

I've been migrating quite a few projects to CoreCLR recently and the lack of ApplicationException is definitely problematic as a lot of existing code is using that type. Using just Exception doesn't sound quite right. Can we have it back in CoreFX?

Other exceptions I've seen no present in CoreFX that would also be useful are:

• AccessViolationException
• EntryPointNotFoundException

Thanks,
Manu

[ellismg]

Why is AccessViolationException useful? Are you throwing instances of it? Catching instances of it? Something else?

Regarding ApplicationException we believe that creating that type was a mistake and are trying to move away from it. From MSDN:

You should derive custom exceptions from the Exception class rather than the ApplicationException class. You should not throw an ApplicationException exception in your code, and you should not catch an ApplicationException exception unless you intend to re-throw the original exception.

I think we are unlikely to add it back to .NET Core.

[manu-st]

I fully understand the rationale for ApplicationException, but removing it is a hard way to make people migrate from it :-)

Some of the code I ported was catching AccessViolationException and this in the context of code that does a lot of interops.

[ellismg]

Some of the code I ported was catching AccessViolationException and this in the context of code that does a lot of interops.

FWIW, this is fragile in general. Starting with .NET 4.0 you aren't able to catch AccessViolationException without opting into handling Corrupted State Exceptions.

[AlexGhiondea]

These have been added to netstandard2.0: https://github.com/dotnet/corefx/blob/master/src/System.Runtime/ref/System.Runtime.cs#L120
https://github.com/dotnet/corefx/blob/master/src/System.Runtime/ref/System.Runtime.cs#L128