Code inspection: Avoid using 'async' for methods and functions with the 'void' return type but without a parameter of type 'System.EventArgs'

This inspection detects methods and functions where the async modifier is used together with the void return type, but the method does not accept a parameter of type System.EventArgs. Such methods are discouraged because unhandled exceptions in these methods cannot be awaited and may crash the application.

            
    public async void Foo(Task<int> task)
    {
        Process(await task);
    }

    public void Process(int i) {}

            
    public async void Foo(Task<int> task)
    {
        try
        {
            Process(await task);
        }
        catch (Exception e)
        {
            throw; // TODO handle exception
        }
    }

    public void Process(int i) {}

        

The quick fix wraps the body of the async void method in a try-catch block. This ensures that any exceptions thrown within the method are caught, preventing unhandled exceptions that could crash the application. You can replace the throw; statement with custom error handling logic depending on the specific requirements of your application.

While this quick fix makes the async void method safer by catching exceptions, it’s generally a better practice to use Task as the return type for async methods wherever possible, except in specific scenarios like event handlers where void is required.

14 July 2025