备注：内容仅提供参考。
⒈添加引用：using Gecko;
⒉然后根据自己的情况在某个方法内添加事件：
LauncherDialog.Download += new EventHandler<LauncherDialogEvent>(OnDownloadFile);
⒊再声明方法：
private void OnDownloadFile(object sender, LauncherDialogEvent e){nsILocalFile objTarget = Xpcom.CreateInstance<nsILocalFile>("@mozilla.org/file/local;1");using (nsAString tmp = new nsAString(@Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\temp.tmp")){objTarget.InitWithPath(tmp);}//Save file dialog Stream myStream;System.Windows.Forms.SaveFileDialog saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();saveFileDialog1.Filter = "All files (*.*)|*.*";saveFileDialog1.FilterIndex = 2;saveFileDialog1.RestoreDirectory = true;saveFileDialog1.FileName = e.Filename;if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK){if ((myStream = saveFileDialog1.OpenFile()) != null){nsIURI source = IOService.CreateNsIUri(e.Url);nsIURI dest = IOService.CreateNsIUri(new Uri(@saveFileDialog1.FileName).AbsoluteUri);nsAStringBase t = (nsAStringBase)new nsAString(System.IO.Path.GetFileName(@saveFileDialog1.FileName));nsIWebBrowserPersist persist = Xpcom.CreateInstance<nsIWebBrowserPersist>("@mozilla.org/embedding/browser/nsWebBrowserPersist;1");persist.SaveURI(source, null, null, null, null, (nsISupports)dest, null);nsIDownloadManager DownloadMan = null;DownloadMan = Xpcom.CreateInstance<nsIDownloadManager>("@mozilla.org/download-manager;1");nsIDownload download = DownloadMan.AddDownload(0, source, dest, t, e.Mime, 0, null, (nsICancelable)persist, false);if (download != null){persist.SetPersistFlagsAttribute(2 | 32 | 16384);persist.SetProgressListenerAttribute((nsIWebProgressListener)download);persist.SaveURI(source, null, null, null, null, (nsISupports)dest, null);}myStream.Close();}}}
