How Do I Effectively Handle Exceptions in C# Tasks?

Exception Handling in Tasks

Catching exceptions raised within System.Threading.Tasks.Task is crucial to ensure the smooth functioning of your applications. Here's a discussion on the best approaches to handle exceptions in Tasks, based on your preferred C# version.

C# 5.0 and Above

With the introduction of async and await keywords, exception handling in Tasks becomes significantly simpler. You can employ a try-catch block within an async method to catch exceptions as follows:

try
{
    var task = Task.Factory.StartNew<StateObject>(() => { /* action */ });
    await task;
}
catch (Exception e)
{
    // Perform cleanup here.
}

Remember to mark the encapsulating method with the async keyword to enable the use of await.

C# 4.0 and Below

For earlier C# versions, you can handle exceptions using the ContinueWith overload that accepts a TaskContinuationOptions value:

var task = Task.Factory.StartNew<StateObject>(() => { /* action */ });

task.ContinueWith(t => { /* error handling */ }, context,
    TaskContinuationOptions.OnlyOnFaulted);

TaskContinuationOptions.OnlyOnFaulted specifies that the continuation should only execute when the antecedent task throws an exception.

You can also handle non-exceptional cases with multiple calls to ContinueWith:

task.ContinueWith(t => { /* error handling */ }, context, 
    TaskContinuationOptions.OnlyOnFaulted);

task.ContinueWith(t => { /* on success */ }, context,
    TaskContinuationOptions.OnlyOnRanToCompletion);

task.Start();

These methods offer different approaches to exception handling in Tasks, providing flexibility and customization based on your C# version.

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