I am trying to get a DOM model from webview control or just HTML to process it by XML tools. That control does not offer any property which returns what I need. I have found a solution by using JS:
string html = Browser1.InvokeScript("eval", new string[] { "document.documentElement.outerHTML;" });
But I am getting a not implemented exception.
What am I doing wrong? I'm new in WP programming.
Like Romasz said use InvokeScriptAsync -- but make sure the page is loaded first.
Sample Application:
<Grid>        
    <StackPanel>
        <WebView x:Name="myWebView" Height="300" VerticalAlignment="Top" />
        <Button Content="Read HTML" Click="Button_Click" />
        <TextBlock x:Name="myTextBlock"></TextBlock>
    </StackPanel>
</Grid>
    private void Page_Loaded(object sender, RoutedEventArgs e)
    {
        this.myWebView.Navigate(new Uri("http://www.google.com", UriKind.Absolute));
    }
    private async void Button_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            string html = await myWebView.InvokeScriptAsync("eval", new string[] { "document.documentElement.outerHTML;" });
            myTextBlock.Text = html;
        }
        catch (Exception ex)
        {
        }
    }

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