private async Task UpdateInventoryAsync(Guid itemId, Int32 quantity)
{
using (ITransaction tx = _stateManager.CreateTransaction())
{
// Use the user’s name to look up their data
var inventoryDictionary = await _stateManager.GetOrAddAsync <IReliableDictionary <Guid, InventoryItem> >("inventoryDictionary");
var originalItem = await inventoryDictionary.TryGetValueAsync(tx, itemId);
if (originalItem.HasValue)
{
var updatedItem = InventoryItem.CreateCopy(originalItem.Value);
updatedItem.InventoryCount = updatedItem.InventoryCount + quantity;
await inventoryDictionary.TryUpdateAsync(tx, itemId, updatedItem, originalItem.Value);
await tx.CommitAsync();
}
}
}