使用System.Threading.Thread时,WPF应用程序崩溃
本文关键字:WPF 应用程序 崩溃 System Threading Thread 使用 | 更新日期: 2023-09-27 18:26:47
我有一个名为submit_Button
的按钮,它在OnClicked事件中有以下代码:
Thread thread = new Thread(new ThreadStart(heavyWork));
thread.Start();
heavyWork功能代码:
private void heavyWork()
{
DisableUI();
string Name = Name_textBox.Text;
celebrityName = Name.Replace(" ", "+");
string queryURL = "http://stackoverflow.com";
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(queryURL);
request.Method = "GET";
// make request for web page
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader htmlSource = new StreamReader(response.GetResponseStream());
string htmlStringSource = string.Empty;
htmlStringSource = htmlSource.ReadToEnd();
response.Close();
//var regex = new Regex(@"<FONT class=""result"">(.*?)</FONT>");
var regex = new Regex(@"<span class=""kno-a-v"">(.*?)</span>");
var match = regex.Match(htmlStringSource);
var result = match.Groups[1].Value;
result = HttpUtility.HtmlDecode(result);
MessageBox.Show(result);
EnableUI();
}
// Functions
private void DisableUI()
{
celebrityName_textBox.IsEnabled = false;
submit_Button.IsEnabled = false;
infoType_listBox.IsEnabled = false;
preloader_Image.Visibility = Visibility.Visible;
}
private void EnableUI()
{
celebrityName_textBox.IsEnabled = true;
submit_Button.IsEnabled = true;
infoType_listBox.IsEnabled = true;
preloader_Image.Visibility = Visibility.Hidden;
}
当我运行应用程序,然后按下按钮,应用程序立即崩溃!
发生了什么事?我尝试使用BackgroundWorker,但当我可以worker.RunWorkerAsync()
时,什么都没有发生(工作程序没有启动)。
MSDN上关于使用Dispatcher 的好文章
如果你想在UI线程上做任何与UI相关的事情,你可以用调度器来做,比如:
private void heavyWork()
{
Application.Current.Dispatcher.Invoke(DispatcherPriority.Normal, new Action(DisableUI));
//rest of method
Application.Current.Dispatcher.Invoke(DispatcherPriority.Normal, new Action(EnableUI));
}
使用后台工作程序时,您的代码应该如下所示:请注意,当您启动worker.RunWorkerSync()方法BackgroundWorkerDoWork时,它被称为
BackgroundWorker _backgroundWorker = new BackgroundWorker
{
WorkerReportsProgress = true,
WorkerSupportsCancellation = true
};
_backgroundWorker.DoWork += BackgroundWorkerDoWork;
_backgroundWorker.RunWorkerCompleted += BackgroundWorkerRunWorkerCompleted;
void BackgroundWorkerDoWork(object sender, DoWorkEventArgs e)
{
//DU STUFF HERE
}
void BackgroundWorkerRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
/DO STUFF HERE LIKE HIDE / SHOW / ENABLE/ DISABLE buttons
}