databind the Source property of the WebBrowser in WPF

The problem is that WebBrowser.Source is not a DependencyProperty. One workaround would be to use some AttachedProperty magic to enable this ability.

public static class WebBrowserUtility{    public static readonly DependencyProperty BindableSourceProperty =        DependencyProperty.RegisterAttached("BindableSource", typeof(string), typeof(WebBrowserUtility), new UIPropertyMetadata(null, BindableSourcePropertyChanged));    public static string GetBindableSource(DependencyObject obj)    {        return (string) obj.GetValue(BindableSourceProperty);    }    public static void SetBindableSource(DependencyObject obj, string value)    {        obj.SetValue(BindableSourceProperty, value);    }    public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)    {        WebBrowser browser = o as WebBrowser;        if (browser != null)        {            string uri = e.NewValue as string;            browser.Source = !String.IsNullOrEmpty(uri) ? new Uri(uri) : null;        }    }}

Then in your xaml do:

<WebBrowser ns:WebBrowserUtility.BindableSource="{Binding WebAddress}"/>

I've amended Todd's excellent answer a little to produce a version that copes with either strings or Uris from the Binding source:

public static class WebBrowserBehaviors{    public static readonly DependencyProperty BindableSourceProperty =        DependencyProperty.RegisterAttached("BindableSource", typeof(object), typeof(WebBrowserBehaviors), new UIPropertyMetadata(null, BindableSourcePropertyChanged));    public static object GetBindableSource(DependencyObject obj)    {        return (string)obj.GetValue(BindableSourceProperty);    }    public static void SetBindableSource(DependencyObject obj, object value)    {        obj.SetValue(BindableSourceProperty, value);    }    public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)    {        WebBrowser browser = o as WebBrowser;        if (browser == null) return;        Uri uri = null;        if (e.NewValue is string )        {            var uriString = e.NewValue as string;            uri = string.IsNullOrWhiteSpace(uriString) ? null : new Uri(uriString);        }        else if (e.NewValue is Uri)        {            uri = e.NewValue as Uri;        }        browser.Source = uri;    }

I wrote a wrapper usercontrol, which makes use of the DependencyProperties:

XAML:

<UserControl x:Class="HtmlBox">    <WebBrowser x:Name="browser" /></UserControl>

C#:

public static readonly DependencyProperty HtmlTextProperty = DependencyProperty.Register("HtmlText", typeof(string), typeof(HtmlBox));public string HtmlText {    get { return (string)GetValue(HtmlTextProperty); }    set { SetValue(HtmlTextProperty, value); }}protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e) {    base.OnPropertyChanged(e);    if (e.Property == HtmlTextProperty) {        DoBrowse();    }} private void DoBrowse() {    if (!string.IsNullOrEmpty(HtmlText)) {        browser.NavigateToString(HtmlText);    }}

and use it like so:

<Controls:HtmlBox HtmlText="{Binding MyHtml}"  />

The only trouble with this one is that the WebBrowser control is not "pure" wpf... it is actually just a wrapper for a win32 component. This means that the control won't respect the z-index, and will always overlay other element (eg: in a scrollviewer this might cause some trouble)more info about these win32-wpf issues on MSDN