// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002691/memorycache-addorgetexisting

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Runtime.Caching;

public class Program

{

    public static void Main()

    {

       var cache2 = new CacheTest();

       var cache3 = new CacheTest();

       var cache4 = new CacheTest();

​

       System.Runtime.Caching.MemoryCache cache = System.Runtime.Caching.MemoryCache.Default;

​

        //C# Extension Method: MemoryCache - AddOrGetExisting

       int cache1_1 = cache.AddOrGetExisting("cache1", 1);

       int cache1_2 = cache.AddOrGetExisting("cache1", 2);

​

       int cache2_1 = cache.AddOrGetExisting("cache2", i => cache2.Increment());

       int cache2_2 = cache.AddOrGetExisting("cache2", i => cache2.Increment());

​

       int cache3_1 = cache.AddOrGetExisting("cache3", i => cache3.Increment(), new CacheItemPolicy());

       int cache3_2 = cache.AddOrGetExisting("cache3", i => cache3.Increment(), new CacheItemPolicy());

​

       int cache4_1 = cache.AddOrGetExisting("cache4", i => cache4.Increment(), new DateTimeOffset(new DateTime(2100, 01, 01)));

       int cache4_2 = cache.AddOrGetExisting("cache4", i => cache4.Increment(), new DateTimeOffset(new DateTime(2100, 01, 01)));

        Console.WriteLine(cache1_1);

        Console.WriteLine(cache1_2);

​

        Console.WriteLine(cache2_1);

        Console.WriteLine(cache2_2);

​

        Console.WriteLine(cache3_1);

        Console.WriteLine(cache3_2);

        Console.WriteLine(cache4_1);

        Console.WriteLine(cache4_2);

    }

    public class CacheTest

    {

        public int Cache = 0;

​

        public int Increment()

        {

            Cache++;

            return Cache;

        }

    }

}