Await list of async predicates, but drop out on first false

Question

Imagine the following class:

public class Checker
{
   public async Task Check() { ... }
}

Now, imagine a list of instances of

Answer 1

All wasn't built with async in mind (like all LINQ), so you would need to implement that yourself:

async Task CheckAll()
{
    foreach(var checker in checkers)
    {
        if (!await checker.Check())
        {
            return false;
        }
    }

    return true;
}

You could make it more reusable with a generic extension method:

public static async Task AllAsync(this IEnumerable source, Func> predicate)
{
    foreach (var item in source)
    {
        if (!await predicate(item))
        {
            return false;
        }
    }

    return true;
}

And use it like this:

var result = await checkers.AllAsync(c => c.Check());