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Making statements based on opinion; back them up with references or personal experience. Psychic Debugging of Async Methods - .NET Parallel Programming Tasks are great, but they can only return one object and only complete once. The exception to this guideline is the Main method for console applications, orif youre an advanced usermanaging a partially asynchronous codebase. That means that this call to StartNew is actually returning a Task>. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Duh, silly me. this is still async and awaitable, just with a little less overhead. Lambda expressions are invoked through the underlying delegate type. Its easy to start several async void methods, but its not easy to determine when theyve finished. Mutually exclusive execution using std::atomic? If you want to create a task wrapper for an existing asynchronous operation or event, use TaskCompletionSource. Not the answer you're looking for? But if you have a method that is just a wrapper, then there's no need to await. Obviously, an async method can create a task, and thats the easiest option. Disconnect between goals and daily tasksIs it me, or the industry? For example, the delegate type is synthesized if the lambda expression has ref parameters. The differences in semantics make sense for asynchronous event handlers. Also if you like reading on dead trees, there's a woefully out-of-date annotated version of the C# 4 spec you might be able to find used. The following example shows how to add attributes to a lambda expression: You can also add attributes to the input parameters or return value, as the following example shows: As the preceding examples show, you must parenthesize the input parameters when you add attributes to a lambda expression or its parameters. @PathogenDavid I'm saying that I'm getting no warning at all, not now nor before the refactoring, I think you misunderstood me. This is by design. References. Figure 3 shows a simple example where one method blocks on the result of an async method. Adds a bit of noise to the code, but fixes the warning (and presumably the underlying issue that comes with it). This inspection reports usages of void delegate types in the asynchronous context. How to prevent warning VSTHRD101 when using Control.BeginInvoke() to call an async method? Instead of forcing you to declare a delegate type, such as Func<> or Action<> for a lambda expression, the compiler may infer the delegate type from the lambda expression. Call void functions because that is what is expected. A lambda expression with an expression on the right side of the => operator is called an expression lambda. Func> getContentsLowerCaseAsync = async url => { string contents = await DownloadString(url); return contents.ToLower(); }; Async methods in C# and Visual Basic can return void, Task, or Task, which means they can be mapped to delegates that return void, Task, or Task.