WPF WebView2 Initialization in viewmodel never returns

Question

In my wpf application i try to show a webView2 for a login, even though when i navigate to the view and start the initialization nothing happens. I've tried many options and solutions i found in the internet and that worked for others but nothing helped.

The Code:

    private WebView2 m_webView21;
    public WebView2 WebView21 { get => m_webView21; set => SetProperty(ref m_webView21, value); }

 protected async Task<WebView2> CreateBrowserAndLoadUrlAsync(string url)
    {
      webView21 = new WebView2();
      webView21.CoreWebView2InitializationCompleted += WebView21_CoreWebView2InitializationCompleted;

      Debug.WriteLine("InitializeAsync");
      await webView21.EnsureCoreWebView2Async();
      Debug.WriteLine("WebView2 Runtime version: " + webView21.CoreWebView2.Environment.BrowserVersionString);

      SetBrowserHostVisibility(Visibility.Visible);
      if (webView21 != null && webView21.CoreWebView2 != null)
      {
        webView21.CoreWebView2.Navigate(url);
      }
      return webView21;
    }

    private void WebView21_CoreWebView2InitializationCompleted(object sender, CoreWebView2InitializationCompletedEventArgs e)
    {
      webView21.Loaded += Browser_FrameLoadEnd;
      webView21.Initialized += Browser_InitializedChanged;
    }

--Xaml Code--

  <Grid Background="Transparent">
    <wv2:WebView2 Visibility="Visible"  Source="{Binding WebView21.Source.AbsoluteUri, Mode=OneWay}"/>
  </Grid>

This is the first thing i'm calling in my viewmodel from the OnNavigatedTo(). Everything works as it should untig it comes to the EnsureCoreWebViewAsync() - from this function it never returns - just nothing happens.

When i do not initialize the webview2 and just set the source to the uri everything works fine aswell. But no events or anything get fired (e.g. NavigationCompleted, SourceChanged, etc.) and i need those events ofc.

I installed the correct runtime i also installed the WebView2 Plugin of course. Also tried different enviroments nothing helped.

So the actual question is, is it even possible to initialize the WebView2 from the Viewmodel?

Does this answer your question? [How can I initialize the WebView2 in WPF?](https://stackoverflow.com/questions/65139090/how-can-i-initialize-the-webview2-in-wpf) — Poul Bak, May 17 '22 at 08:13
Retry [this](https://learn.microsoft.com/en-us/microsoft-edge/webview2/get-started/wpf) from scratch and come back tell us where it failed. — Orace, May 17 '22 at 10:02
Already went through this, Step 9.1 is where it failed. It's the same behavior as i mentioned in the question, it never returns from the await part :( — KSler, May 17 '22 at 10:06
You're just trying to create a webview2 without placing it in parent? Do you intend to put it in a UIElement after it's initialized? — Jay Buckman, May 17 '22 at 11:05
Yes indeed, The Webview should be shown in my View after. But i need the initialization to use the CookieManager first. I'll put the xaml code in the question aswell :) — KSler, May 17 '22 at 11:09
I don't think you can await the initialization of a webview without it being in the gui because it's not part of the application's event loop yet. — Jay Buckman, May 17 '22 at 11:28

score 0 · Accepted Answer · edited May 18 '22 at 05:03

0

I found the solution. I had to use a placeholder in my xaml which later init's the webView2 in my Viewmodel.

Just change the xaml code from the question with this and it should work fine

 <ContentControl Content="{Binding WebView21, Mode=OneWay}" />

Thanks for all the helpful comments :))

edited May 18 '22 at 05:03

Chadley08

559
1
8
26

answered May 17 '22 at 11:52

KSler

121
9

WPF WebView2 Initialization in viewmodel never returns

1 Answers1