How Can Lambda Expressions Simplify Retry Logic in C#?

Streamlining C# Retry Logic with Lambda Expressions

In C#, retrying operations is a common task. Traditional methods often involve explicit retry loops, leading to verbose and less reusable code. Lambda expressions offer a more elegant solution.

This example demonstrates a reusable lambda-based retry wrapper:

<code class="language-csharp">public static class RetryHelper
{
    public static void Execute(Action action, TimeSpan retryInterval, int maxAttempts = 3)
    {
        Execute(() => { action(); return null; }, retryInterval, maxAttempts);
    }

    public static T Execute<T>(Func<T> action, TimeSpan retryInterval, int maxAttempts = 3)
    {
        var exceptions = new List<Exception>();

        for (int attempt = 0; attempt < maxAttempts; attempt++)
        {
            try
            {
                return action();
            }
            catch (Exception ex)
            {
                exceptions.Add(ex);
                if (attempt < maxAttempts - 1)
                {
                    Thread.Sleep(retryInterval);
                }
            }
        }
        throw new AggregateException("Retry attempts failed.", exceptions);
    }
}</code>

This RetryHelper class encapsulates retry logic. You provide the action (or function) to retry, the retry interval, and the maximum number of attempts.

Usage is straightforward:

<code class="language-csharp">RetryHelper.Execute(() => SomeMethodThatMightFail(), TimeSpan.FromSeconds(2)); </code>

For methods returning a value:

<code class="language-csharp">int result = RetryHelper.Execute(() => SomeMethodReturningInt(), TimeSpan.FromMilliseconds(500), 5);</code>

An asynchronous overload could easily be added for asynchronous operations. This approach provides a concise and reusable solution for handling retry logic in C#.

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