如何创建并在后台线程中使用web浏览器？ [英] How to create and use WebBrowser in background thread?

问题描述

我怎样才能在后台STA线程创建System.Windows.Forms.WebBrowser？我尝试用一​​些code是这样的：

How can I create System.Windows.Forms.WebBrowser in background STA thread? I try use some code like this:

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，委托至极对象System.Windows.Forms.WebBrowser导航方法，并等待页面加载完成。问题是System.Windows.Forms.WebBrowser对象LoadCompleted事件不会引发。我找到了一些解决方案，这里，但它不工作（在我的WPF应用程序无法找到方法Application.Run（） ）。

CWebBrowser - custom class, wich delegate System.Windows.Forms.WebBrowser object Navigate method and wait until page completed loads. The problem is LoadCompleted event on System.Windows.Forms.WebBrowser object never raises. I found some solution here, but it does not work (can't find method Application.Run() on my WPF app).

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;
    }
}

Thansk所有建议和我的英语不好对不起：O（

Thansk for all advices and sorry for my bad english :o(

推荐答案

你为什么不使用默认的WebBrowser控件这样？

Why don't you use the default WebBrowser control like this?

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 System.Windows.Forms.WebBrowser 控制，而不是 System.Windows.Controls.WebBrowser 这是WPF的一部分。

You are using old System.Windows.Forms.WebBrowser control, instead System.Windows.Controls.WebBrowser which is part of WPF.

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