/// <summary>
/// Gets the life span for cache items based on the extended <see cref="ApiMethodEnum"/> member.
/// </summary>
/// <param name="method">The API method for which to calculate the cache life span.</param>
/// <param name="client">The governing <see cref="IStackClient"/> instance.</param>
/// <returns>The life span duration after which a cache item is no longer considered fresh.</returns>
public static TimeSpan?GetCacheLifeSpan(this ApiMethodEnum method, IStackClient client)
{
if (client == null)
{
throw new ArgumentNullException("client");
}
if (client.Default.CacheLifeSpan.ContainsKey(method))
{
return(client.Default.CacheLifeSpan[method]);
}
CacheLifeSpanAttribute lifeSpan = method.GetCustomAttribute <CacheLifeSpanAttribute>();
if (lifeSpan != null)
{
return(lifeSpan.Duration);
}
return(null);
}
