我有一个应用程序,该应用程序每次以以下方式更新我正在监视的日志文件(附加新文本)时都会更新我的datagrid:
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,所以当我尝试运行dataGridRows.Add(ds); 要添加新行,程序会在调试模式下崩溃而没有任何警告。
在Winforms中,可以通过使用Invoke函数轻松解决此问题,但是我不确定如何在WPF中进行此操作。
您可以使用
Dispatcher.Invoke(Delegate, object[])
在Application(或任何UIElement)调度程序上。
Application
UIElement
您可以像这样使用它:
Application.Current.Dispatcher.Invoke(new Action(() => { /* Your code here */ }));
要么
someControl.Dispatcher.Invoke(new Action(() => { /* Your code here */ }));