WPF双向绑定无限循环

本文关键字：无限循环 绑定 WPF | 更新日期: 2023-09-27 18:01:20

由于Web浏览器控件的功能相当有限。我试图使用WindowsFormsHost创建一个具有双向数据绑定的WebView控件。当导航到新url时，控件的url属性应该更新。然而，在我看来，属性在无限循环中发生变化并导致应用程序崩溃。如何解决这个问题，同时允许重新加载相同的url?

代码如下:

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);
    }
}

WPF双向绑定无限循环

最快的方法是添加一个布尔" navigation"标志-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;
}
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