Run async method regularly with specified interval

by

The async equivalent is a while loop with Task.Delay (which internally uses a System.Threading.Timer):

public async Task PeriodicFooAsync(TimeSpan interval, CancellationToken cancellationToken)
{
    while (true)
    {
        await FooAsync();
        await Task.Delay(interval, cancellationToken)
    }
}

It’s important to pass a CancellationToken so you can stop that operation when you want (e.g. when you shut down your application).

Now, while this is relevant for .Net in general, in ASP.Net it’s dangerous to do any kind of fire and forget. There are several solution for this (like HangFire), some are documented in Fire and Forget on ASP.NET by Stephen Cleary others in How to run Background Tasks in ASP.NET by Scott Hanselman

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