Async Task Main

dotnet/csharplang proposal

Technical Details

• The compiler must recognize Task and Task<int> as valid entrypoint return types in addition to void and int.
• The compiler must allow async to be placed on a main method that returns a Task or a Task<T> (but not void).
• The compiler must generate a shim method $EntrypointMain that mimics the arguments of the user-defined main.
  • static async Task Main(...) -> static void $EntrypointMain(...)
  • static async Task<int> Main(...) -> static int $EntrypointMain(...)
  • The parameters between the user-defined main and the generated main should match exactly.
• The body of the generated main should be return Main(args...).GetAwaiter().GetResult();