Caching method results with AOP - Cache Provider

cache-result-aop-src-cache-provider.cs

public interface ICacheProvider
{
    object Get(string key);

    void Put(string key, object value, int duration);

    bool Contains(string key);
}

public class MemoryCacheProvider : ICacheProvider
{
    public object Get(string key)
    {
        return MemoryCache.Default[key];
    }

    public void Put(string key, object value, int duration)
    {
        if (duration <= 0)
            throw new ArgumentException("Duration cannot be less or equal to zero", "duration");
        
        var policy = new CacheItemPolicy
        {
            AbsoluteExpiration = DateTime.Now.AddMilliseconds(duration)
        };

        MemoryCache.Default.Set(key, value, policy);
    }

    public bool Contains(string key)
    {
        return MemoryCache.Default[key] != null;
    }
}