memdistcachingfour.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllers();

    services.AddMemoryCache();
    services.AddSingleton<IConnectionMultiplexer>(provider => ConnectionMultiplexer.Connect("your redis connection string"));
    services.AddScoped<ICacheService, CacheService>();
    services.AddScoped<IWeatherService, WeatherService>();
}