Difference between OperationCanceledException and TaskCanceledException?

c# exception asynchronous task
Peter picture Peter · Oct 24, 2012 · Viewed 13.7k times · Source

What is the difference between OperationCanceledException and TaskCanceledException? If I am using .NET 4.5 and using the async/await keywords, which one should I be looking to catch?

Answer

Jon Skeet picture Jon Skeet · Oct 24, 2012

OperationCanceledException is simply the base class for TaskCanceledException - so if you catch the former, you'll still catch the latter.

Some operations on concurrent collections throw just OperationCanceledException, as there aren't any actual tasks involved (at least as far as the public API is concerned). See BlockingCollection.TryTake for an example.

I would catch the OperationCanceledException just in case the task is cancelled due to an operation which itself just threw OperationCanceledException - you probably still want to treat that as "just cancellation".

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