using System;

using System.Threading.Tasks;

using Microsoft.Extensions.Caching.Memory;

​

class Program

{

    static async Task Main(string[] args)

    {

        var memoryCache = new MemoryCache(new MemoryCacheOptions());

​

        // Generate two GUID keys

        var guidKey1 = Guid.NewGuid().ToString();

        var guidKey2 = Guid.NewGuid().ToString();

        Console.WriteLine($"Guid key 1: {guidKey1}");

        Console.WriteLine($"Guid key 2: {guidKey2}");

​

        var firstRequestTask = FetchAndWriteToConsole(memoryCache, guidKey1, 10);

        var secondRequestTask = FetchAndWriteToConsole(memoryCache, guidKey2);

        var cacheRequestTask = FetchAndWriteToConsole(memoryCache, guidKey2);

        await Task.WhenAll(firstRequestTask, secondRequestTask, cacheRequestTask)

            .ConfigureAwait(false);

    }

    private async static Task FetchAndWriteToConsole(MemoryCache memoryCache, string key, int delayInSeconds = 0)

    {

        var cacheEntry = await memoryCache.GetOrCreateAsync<string>(key, async entry =>

        {

            entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(5); // Set expiration

            return await Task.Run(() =>

            {

                Task.Delay(3000).Wait(); // Wait for 3 seconds

                return ($"Cached Value for GUID {key}");

            }).ConfigureAwait(false);

        }).ConfigureAwait(false);

        Console.WriteLine($"Cache Entry for {key}: {cacheEntry}");

    }

}

​