Real Web Developers

MemoryCache

Author

Scott Rickman

Last updated

2026-08-20

Program.cs

namespace RealWebDevelopers;

using Microsoft.Extensions.Caching.Memory;

public class Program
{
    public static void Main(string[] args)
    {
        // ...
        builder.Services.AddMemoryCache();
    }
}

Provider.cs

namespace RealWebDevelopers;

public class Provider
{
    private readonly IMemoryCache memoryCache;
    private readonly MemoryCacheEntryOptions memoryCacheEntryOptions = new MemoryCacheEntryOptions
    {
        AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(60); // Cache for 1 hour
    }

    public Provider(IMemoryCache memoryCache)
    {
        this.memoryCache = memoryCache;
    }

    public IEnumberable<Product> GetProducts()
    {
        var cacheKey = "product";
        if (!this.memoryCache.TryGetValue(cacheKey, out List<Product> productCache))
        {
            try
            {
                // Fetch the data from source i.e. Database query
                var products = this.session.Query<Product>();
                this.memoryCache.Set(cacheKey, products, this.memoryCacheEntryOptions);
                return products;
            }
            catch
            {
                // Whatever
            }
        }

        return productCache;
    }
}