exception handling

Task EventHandlers – The Little Secret You Didn’t Know

As C# programmers, we've all been burned by asynchronous EventHandlers. And if you still haven't yet, then hopefully this article will arm you for being able to better navigate long debugging sessions where functionality mysteriously stops working in your application. While there are several different solutions for dealing with async event handlers, either by avoiding use of async void or even by embracing async void, in this article we will explore another option which is Task EventHandlers. Disclaimer: this article was originally written with the perspective that this solution feels close to bullet-proof, but there are important limitations. These limitations are addressed later in the article, and I felt it would still be valuable to explore the space (both positives and negatives). A Companion Video! https://www.youtube.com/watch?v=QVGjpRz0JZU What you DIDN'T know about C# Async EventHandlers The Source of the Problem Normal…

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February 18, 2023

CodeProject / Programming / Tips / Tutorial

Async EventHandlers – A Simple Safety Net to the Rescue

When we discuss async EventHandlers, the first thing that comes to mind for many of us is that it's the only exception that we seem to allow for the dreaded async void setup. When I had written about this before, I was excited that I was exploring a solution that involved actually allowing async void to exist (without wanting to pull the rest of my hair out). For me, this was much more about some clever tricks we can use to overcome async EventHandlers than it was to provide solutions for avoiding the problem entirely. With that said though, there was a lot of traction on the article, which I am very thankful for, and some folks expressed opinions that they'd rather solve async EventHandlers a different way. I thought this was a great point, so I wanted to come…

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February 14, 2023

CodeProject / Programming / Tips / Tutorial

async void – How to Tame the Asynchronous Nightmare

You're an intermediate dotnet programmer and you mostly know your way around using Tasks. You sprinkle async and await through your code, and everything is working just as expected. You've heard time and time again that you always want the return types of your asynchronous methods to be a Task (or Task<T>) and that async void is essentially the root of all evil. No sweat. One day you go to wire up an event handler using the syntax myObject.SomeEvent += SomeEventHandler, and your event handler needs to await some asynchronous code. You take all of the right steps and change your method signature to get that beautiful async Task added in, replacing void. But suddenly you get a compile error about your event handler not being compatible. You feel trapped. You're scared. And then you do the unspeakable... You change…

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January 27, 2023

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