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Ali Alp
Ali Alp

Posted on • Updated on

Async/Await easy retry in c#

#csharp #dotnet #webdev #productivity

In Asynchronous programming in some cases we need to retry a method if it fails. Easy-Retry can provide this functionality with ease :)

NuGet Installation

GitHub Source Code 

.Net CLI
dotnet add package EasyRetry

Package Manager
Install-Package EasyRetry
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Usage

Let's say there is a HTTP Task which you need to retry in case it fails

private async Task Task_NetworkBound()
{
    await new HttpClient().GetStringAsync("https://dotnetfoundation.org");
}
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In order to retry it after 5 seconds you just need to do as follows

//With DI
await _easyRetry.Retry(async () => await Task_NetworkBound());

//Without DI
await new EasyRetry().Retry(async () => await Task_NetworkBound());
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Or you can use the retry options to customize the behavior of the retry algorithm as follows

await _easyRetry.Retry(async () => await Task_NetworkBound()
    , new RetryOptions()
    {
        Attempts = 3,
        DelayBetweenRetries = TimeSpan.FromSeconds(3),
        DelayBeforeFirstTry = TimeSpan.FromSeconds(2),
        EnableLogging = true,
        DoNotRetryOnTheseExceptionTypes = new List<Type>()
        {
            typeof(NullReferenceException)
        }
    });
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NuGet Installation

GitHub Source Code

Top comments (7)

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ilmtitan profile image
Jim Przybylinski •

I don't think this library does what you think it does. Awaiting a task a second time does not restart the operation. For it to work, this test code will needs to pass:

        [Test]
        public async Task TestFailThenSucceed()
        {
            int iteration = 1;
            await Task.Run(() =>
            {
                if (iteration++ == 1)
                {
                    throw new Exception();
                }
            }).Retry();
        }

It does not pass, and neither does the unit test you wrote.

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alialp profile image
Ali Alp •

You are right :) , I have fixed the code and released as version 2.0.0. your test has been included in the project as well :) github.com/alicommit-malp/Easy-Ret...

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thebuzzsaw profile image
Kelly Brown •

I feel like DoNotRetryOnTheseExceptions should either be a list of Type objects or a series of Predicate<Exception> filters. Holding instances seems odd... and wasteful.

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alialp profile image
Ali Alp •

You are right :) , Thanks for the tip, I have changed the code accordingly

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alialp profile image
Ali Alp •

I have changed the implementation and released the version 2.0.0. please check it out

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katnel20 profile image
Katie Nelson •

How do you know that your awaited task failed? Mine either throw an exception or they time out.
How does this retry library handle both cases?

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alialp profile image
Ali Alp •

Why do you separate time out from exception? which case are you talking about? In my world time out is an exception as well and the Easy-Retry is running the awaited task in a try catch block Source Code.

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