2015-09-05 67 views
1

我在我的應用程序中允許用戶下載最新版本的應用程序的代碼。應用程序下載完成後,如果用戶想要打開文件位置以查看該文件,則會打開提示。已完成異步下載,而不是一次

但是,該工具啓動兩個消息框而不是一次。我不確定我是否錯過了一些東西。

private void BTN_GNV_MouseUp(object sender, MouseButtonEventArgs e) 
{ 
    string URLDir = "http://shard.combatkingz.com/downloads/"; 
    string URLName = "DayZ Config Tweak tool v" + Properties.Settings.Default.AvailableVersion + ".exe"; 
    string URLFull = ""; 
    using (WebClient DLWC = new WebClient()) 
    { 
     URLFull = URLDir + URLName; 
     GlobalVars.DLPath = System.Environment.CurrentDirectory + "\\" + URLName; 
     try 
     { 
      DLWC.DownloadFileAsync(new Uri(URLFull), GlobalVars.DLPath); 
      DLWC.DownloadProgressChanged += DLWC_DownloadProgressChanged; 
     } 
     catch 
     { 
      MessageBox.Show("There was an error downloading the file.", GlobalVars.APPNAME, MessageBoxButton.OK, MessageBoxImage.Error); 
#if DEBUG 
#else 
      AddDownloadToDB("Failed"); 
#endif 
     } 
    } 
} 
void DLWC_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e) 
{ 
    PB_GNV.Width = (BTN_GNV.Width/100) * e.ProgressPercentage; 
    if (PB_GNV.Width == BTN_GNV.Width && e.TotalBytesToReceive == e.BytesReceived) 
    { 
     MessageBoxResult nav = MessageBox.Show("New version downloaded. Do you want to navigate to the folder?", GlobalVars.APPNAME, MessageBoxButton.YesNo, MessageBoxImage.Error); 
     if (nav == MessageBoxResult.Yes) 
     { 
      string argument = @"/select, " + @GlobalVars.DLPath; 
      System.Diagnostics.Process.Start("explorer.exe", argument); 
#if DEBUG 
#else 
      AddDownloadToDB("Success"); 
#endif 
     } 
    } 
} 

回答

1

我懷疑DownloadProgressChanged事件在接收到最後一個字節並在文件完成時觸發。使用DownloadFileCompleted事件應該可以解決問題。

+0

是的。 DownloadFileCompleted處理程序修復了這個問題。它不再顯示兩次並且完美地工作。謝謝! – DethoRhyne

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