在form1的顶部我做了:WebClientClient;然后在构造函数中:Client=newWebClient();Client.DownloadFileCompleted+=Client_DownloadFileCompleted;Client.DownloadProgressChanged+=Client_DownloadProgressChanged;然后我每分钟都会调用这个方法:privatevoidfileDownloadRadar(){if(Client.IsBusy==true){Client.CancelAsync();}else{Client.DownloadPr