how can allow this loop to call async methods

Question

I have this loop:

public static void ForEachValue<T>(Action<T> F) { foreach (var E in GetValues<T>()) { F(E); } }

It allows to iterate through enum members and call a method for each.

I would like to allow to take async methods as well and await them, but I can't find the syntax that would work.

An async method should be returning a Task so you need Func<T, Task> — DavidG
– DavidG, Commented Jul 2, 2019 at 11:27

DavidG · Accepted Answer · 2019-07-02 11:32:22Z

An async method should be returning a Task so you need to use Func<T, Task> instead of Action<T>. So you could do this and await every task:

public static async Task ForEachValue<T>(Func<T, Task> F) { foreach (var E in GetValues<T>()) { await F(E); } }

Or you could even shorten it to this:

public static async Task ForEachValue<T>(Func<T, Task> F) { var tasks = GetValues<T>().Select(F); await Task.WhenAll(tasks); }

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