在WPF中安全地访问UI(主)线程
我有一个应用程序,每次我正在观看的日志文件更新时都会更新我的数据网格(附加新文本),方法如下:
private void DGAddRow(string name, FunctionType ft) { ASCIIEncoding ascii = new ASCIIEncoding(); CommDGDataSource ds = new CommDGDataSource(); int position = 0; string[] data_split = ft.Data.Split(' '); foreach (AttributeType at in ft.Types) { if (at.IsAddress) { ds.Source = HexString2Ascii(data_split[position]); ds.Destination = HexString2Ascii(data_split[position+1]); break; } else { position += at.Size; } } ds.Protocol = name; ds.Number = rowCount; ds.Data = ft.Data; ds.Time = ft.Time; dataGridRows.Add(ds); rowCount++; } ... private void FileSystemWatcher() { FileSystemWatcher watcher = new FileSystemWatcher(Environment.CurrentDirectory); watcher.Filter = syslogPath; watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName; watcher.Changed += new FileSystemEventHandler(watcher_Changed); watcher.EnableRaisingEvents = true; } private void watcher_Changed(object sender, FileSystemEventArgs e) { if (File.Exists(syslogPath)) { string line = GetLine(syslogPath,currentLine); foreach (CommRuleParser crp in crpList) { FunctionType ft = new FunctionType(); if (crp.ParseLine(line, out ft)) { DGAddRow(crp.Protocol, ft); } } currentLine++; } else MessageBox.Show(UIConstant.COMM_SYSLOG_NON_EXIST_WARNING); }
当为FileWatcher引发事件时,因为它创建了一个单独的线程,当我尝试运行dataGridRows.Add(ds)时; 要添加新行,程序只会在调试模式下没有任何警告的情况下崩溃。
在Winforms中,这可以通过使用Invoke函数轻松解决,但我不知道如何在WPF中进行此操作。
aluckdog