How to avoid the 0-byte file on Webclient download error
_client.DownloadDataAsync(new Uri(url)); _client.DownloadDataCompleted += (sender, e) => { try { if (e.Result != null && e.Result.Length > 0 && e.Error == null && e.Cancelled == false) using (FileStream fileStream = new FileStream(path + file_name, FileMode.Create)) fileStream.Write(e.Result, 0, e.Result.Length); } catch (Exception ex) { OpenOperator.Error(string.Format("列表页生成任务异常,url:{0}", url), ex); } };
大规模download会涉及到站点并发问题,请参见:
.Net魔法堂:开启IIS的WebGarden、WebFarm和StateServer之旅