Question

因为， Web浏览器控件的功能相当有限。我正在尝试使用WindowsFormsHost创建一个带有双向数据绑定的WebView控件。当我导航到新的URL时，应该更新控件的url属性。但是，在我看来，属性在无限循环中发生变化并使应用程序崩溃。如何在允许重新加载相同网址的同时解决此问题？

以下是代码：

public class WebView : WindowsFormsHost
{
    private WebBrowser webBrowser;

    public static readonly DependencyProperty UrlProperty =
        DependencyProperty.Register("Url", typeof(Uri), typeof(WebView), new FrameworkPropertyMetadata(default(Uri), UrlPropertyChangedCallback));

    public Uri Url
    {
        get { return (Uri)GetValue(UrlProperty); }
        set { SetValue(UrlProperty, value); }
    }

    private static void UrlPropertyChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        (sender as WebView).webBrowser.Url = e.NewValue as Uri;
    }

    public WebView()
    {
        webBrowser = new System.Windows.Forms.WebBrowser();
        webBrowser.Navigating += webBrowser_Navigating;
        Child = webBrowser;
    }
    private void webBrowser_Navigating(object sender, WebBrowserNavigatingEventArgs e)
    {
        SetCurrentValue(UrlProperty, webBrowser.Url);
    }
}

Answer 1

最快的方法是添加一个布尔值＆＃34;导航＆＃34;旗帜 - 例如

bool navigating= false;    
private void webBrowser_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
    navigating= true;
    SetCurrentValue(UrlProperty, webBrowser.Url);
    navigating= false;
}

private static void UrlPropertyChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
    if (!navigating)
        (sender as WebView).webBrowser.Url = e.NewValue as Uri;
}

WPF双向绑定无限循环

1 个答案: