public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
    services.AddMemoryCache();
}

public interface IMemoryCache : IDisposable
{
    bool TryGetValue(object key, out object value);
    ICacheEntry CreateEntry(object key);
    void Remove(object key);
}

public YourClassConstructor(IMemoryCache cache)
{
   this.cache = cache;
}

cache.Set(“Key”, DataToCache);

[HttpGet()]
public string Get()
{
   return cache.Get<TypeOfYourCachedData>(CacheKey);
}