public async Task LoadFromProviderAsync(IKeyValueSource <V> provider, bool flush = true)
{
Contract.NotNull(provider, nameof(provider));
if (flush && !this.cacheProvider.SupportsFlushing)
{
throw new NotSupportedException("The provider does not support flushing the cache");
}
var items = await provider.GetAllAsync();
await this.cacheProvider.SetAsync(items, flush : flush);
}
