Support for both reference types and value types

Question

I`ve got this class with this method where I require to support for both reference types and value types but I do not know how exactly how to perform this. Any help would be much appreciated.

public static class CacheHelper<T>
{
    public static T Get(string key, Func<T> function) {
        var obj = (T)HttpContext.Current.Cache[key];
        if (obj == null)
        {
            obj = function.Invoke();
            HttpContext.Current.Cache.Add(key, obj, null, DateTime.Now.AddMinutes(3),
                TimeSpan.Zero, System.Web.Caching.CacheItemPriority.Normal, null);
        }
        return (T)obj;
    }
}

Answer 1

I think if you remove the cast to T on this line var obj = HttpContext.Current.Cache[key]; you should be fine.

public static class CacheHelper<T>
{
    public static T Get(string key, Func<T> function) {
        var obj = HttpContext.Current.Cache[key];
        if (obj == null)
        {
            obj = function.Invoke();
            HttpContext.Current.Cache.Add(key, obj, null, DateTime.Now.AddMinutes(3),
                TimeSpan.Zero, System.Web.Caching.CacheItemPriority.Normal, null);
        }
        return (T)obj;
    }
}