在 WPF 中安全地访问 UI(主)线程 [英] Accessing UI (Main) Thread safely in WPF
问题描述
我有一个应用程序,每次我正在查看的日志文件以下列方式更新(附加新文本)时,它都会更新我的数据网格:
I have an application which updates my datagrid each time a log file that I'm watching gets updated (Appended with new text) in the following manner:
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);添加新行时,程序会在调试模式下崩溃而没有任何警告.
When the event is raised for the FileWatcher, because it creates a separate thread, when I try to run dataGridRows.Add(ds); to add the new row, the program just crashes without any warning given during debug mode.
在 Winforms 中,这可以通过使用 Invoke 函数轻松解决,但我不确定如何在 WPF 中解决此问题.
In Winforms, this was easily solved by utilizing the Invoke function but I am not sure how to go about this in WPF.
推荐答案
您可以使用
Dispatcher.Invoke(Delegate, object[])
在 Application
(或任何 UIElement
的)调度程序上.
on the Application
's (or any UIElement
's) dispatcher.
你可以像这样使用它:
Application.Current.Dispatcher.Invoke(new Action(() => { /* Your code here */ }));
或
someControl.Dispatcher.Invoke(new Action(() => { /* Your code here */ }));
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