如何在后台 STA 线程中创建 System.Windows.Forms.WebBrowser?我尝试使用这样的代码:
var tr = new Thread(wbThread);
tr.SetApartmentState(ApartmentState.STA);
tr.Start();
private void wbThread()
{
CWebBrowser browser = new CWebBrowser();
var text = browser.Navigate("http://site.com", CWebBrowser.EventType.loadCompleted).Body.InnerHtml;
}
CWebBrowser - 自定义类,它委托 System.Windows.Forms.WebBrowser 对象 Navigate 方法并等待页面完成加载。问题是 System.Windows.Forms.WebBrowser 对象上的 LoadCompleted 事件永远不会引发。我找到了一些解决方案here https://stackoverflow.com/a/4271581/432853,但它不起作用(在我的 WPF 应用程序上找不到方法 Application.Run() )。
public class CWebBrowser : ContentControl
{
public readonly System.Windows.Forms.WebBrowser innerWebBrowser;
private readonly AutoResetEvent loadCompletedEvent;
private readonly AutoResetEvent navigatedEvent;
public enum EventType
{
navigated, loadCompleted
}
public CWebBrowser()
{
innerWebBrowser = new System.Windows.Forms.WebBrowser();
loadCompletedEvent = new AutoResetEvent(false);
navigatedEvent = new AutoResetEvent(false);
System.Windows.Forms.Integration.WindowsFormsHost host = new System.Windows.Forms.Integration.WindowsFormsHost();
host.Child = innerWebBrowser;
Content = host;
innerWebBrowser.DocumentCompleted +=new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(innerWebBrowser_DocumentCompleted);
innerWebBrowser.Navigated += new System.Windows.Forms.WebBrowserNavigatedEventHandler(innerWebBrowser_Navigated);
}
void innerWebBrowser_Navigated(object sender, System.Windows.Forms.WebBrowserNavigatedEventArgs e)
{
navigatedEvent.Set();
}
void innerWebBrowser_DocumentCompleted(object sender, System.Windows.Forms.WebBrowserDocumentCompletedEventArgs e)
{
if (((sender as System.Windows.Forms.WebBrowser).ReadyState != System.Windows.Forms.WebBrowserReadyState.Complete) || innerWebBrowser.IsBusy)
return;
var doc = innerWebBrowser.Document;
loadCompletedEvent.Set();
}
public System.Windows.Forms.HtmlDocument Navigate(string url, EventType etype)
{
if (etype == EventType.loadCompleted)
loadCompletedEvent.Reset();
else if (etype == EventType.navigated)
navigatedEvent.Reset();
innerWebBrowser.Navigate(url);
if (etype == EventType.loadCompleted)
loadCompletedEvent.WaitOne();
else if (etype == EventType.navigated)
navigatedEvent.WaitOne();
System.Windows.Forms.HtmlDocument doc = null;
Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Background, new Action(
delegate
{
doc = innerWebBrowser.Document;
}));
return doc;
}
}
感谢您的所有建议,并对我的英语不好感到抱歉:o(
为什么不使用像这样的默认 WebBrowser 控件呢?
public MainPage()
{
InitializeComponent();
System.Windows.Deployment.Current.Dispatcher.BeginInvoke(startNavigate);
}
void startNavigate()
{
WebBrowser wb = new WebBrowser();
wb.LoadCompleted += new LoadCompletedEventHandler(wb_LoadCompleted);
wb.Navigated += new EventHandler<System.Windows.Navigation.NavigationEventArgs>(wb_Navigated);
wb.Navigate(new Uri("http://www.google.com"));
}
void wb_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
{
// e.Content
}
void wb_LoadCompleted(object sender, NavigationEventArgs e)
{
// e.Content when the document finished loading.
}
编辑:您正在使用旧的System.Windows.Forms.WebBrowser
控制,而不是System.Windows.Controls.WebBrowser
它是 WPF 的一部分。
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