[英]WPF two way binding infinite loop
因為, Web瀏覽器控件的功能相當有限。 我正在嘗試使用WindowsFormsHost
創建具有雙向數據綁定的WebView控件。 當我導航到新的URL時,應更新控件的url屬性。 但是,在我看來,該屬性在無限循環中發生更改,並導致應用程序崩潰。 如何在允許重新加載相同網址的同時解決此問題?
下面是代碼:
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);
}
}
最快的方法是添加一個布爾“導航”標志-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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