protected async Task <LoadMoreItemsResult> LoadMoreItemsAsync(CancellationToken c, uint count) { try { OnLoadMoreStarted?.Invoke(count); // 我们忽略了CancellationToken,因为我们暂时不需要取消,需要的可以加上 var result = await _dataFetchDelegate(count); var items = result; if (items != null) { foreach (var item in items) { Add(item); } } // 加载完成事件 OnLoadMoreCompleted?.Invoke(items?.Count ?? 0); return(new LoadMoreItemsResult { Count = items == null ? 0 : (uint)items.Count }); } finally { Busy = false; } }
protected async Task <LoadMoreItemsResult> LoadMoreItemsAsync(CancellationToken c, uint count) { if (!HasMoreItems) { return new LoadMoreItemsResult { Count = 0 } } ; if (_dataFetchDelegate == null) { throw new NotImplementedException("IncrementalCollection's delegate is null"); } try { OnLoadMoreStarted?.Invoke((int)count); //忽略了CancellationToken var result = await this._dataFetchDelegate(count); var items = result.Item1; if (items != null) { foreach (var item in items) { this.Add(item); } } // 是否还有更多 this.HasMoreItems = result.Item2; // 加载完成事件 OnLoadMoreCompleted?.Invoke(items == null ? 0 : items.Count); return(new LoadMoreItemsResult { Count = items == null ? 0 : (uint)items.Count }); } finally { _busy = false; } } }
protected async Task <LoadMoreItemsResult> LoadMoreItemsAsync(CancellationToken c, uint count) { var dispatcherQueue = Windows.System.DispatcherQueue.GetForCurrentThread(); try { OnLoadMoreStarted?.Invoke(count); // 我们忽略了CancellationToken,因为我们暂时不需要取消,需要的可以加上 var result = await _dataFetchDelegate(count); var items = result.Item1; if (items != null) { await dispatcherQueue.EnqueueAsync(() => { foreach (var item in items) { Add(item); } }); } // 是否还有更多 HasMoreItems = result.Item2; // 加载完成事件 OnLoadMoreCompleted?.Invoke(items == null ? 0 : items.Count); return(new LoadMoreItemsResult { Count = items == null ? 0 : (uint)items.Count }); } finally { await dispatcherQueue.EnqueueAsync(() => { IsBusy = false; }); } }
protected async Task <LoadMoreItemsResult> LoadMoreItemsAsync(CancellationToken c, uint count) { uint cn = 0; try { this.OnLoadMoreStarted?.Invoke(count); // 我们忽略了CancellationToken,因为我们暂时不需要取消,需要的可以加上 var result = await this._dataFetchDelegate(count); var items = result.Item1; if (items != null) { foreach (var item in items) { cn++; this.Add(item); //await Task.Delay(50); } } // 是否还有更多 this.HasMoreItems = result.Item2; // 加载完成事件 OnLoadMoreCompleted?.Invoke((int)cn); return(new LoadMoreItemsResult { Count = cn }); } finally { _busy = false; } }
private async Task <LoadMoreItemsResult> LoadMoreItemsInternal(CancellationToken c, uint count) { try { // 加载开始事件 OnLoadMoreStarted?.Invoke(this, count); var items = await LoadMoreItemsAsync(c, count); AddRange(items); // 加载完成事件 OnLoadMoreCompleted?.Invoke(this, (uint)(items?.Count() ?? 0)); return(new LoadMoreItemsResult { Count = (uint)(items?.Count() ?? 0) }); } finally { _busy = false; } }