How do I use WebView2 in a console application

Question

string text = "return 'test';";
var webView = new Microsoft.Web.WebView2.WinForms.WebView2();
webView.EnsureCoreWebView2Async(null).RunSynchronously();
var srun = webView.CoreWebView2.ExecuteScriptAsync(text);

When I run the above code EnsureCoreWebView2Async is getting this exception

"Cannot change thread mode after it is set. (Exception from HRESULT: 0x80010106 (RPC_E_CHANGED_MODE))"

What do I need to do to run this with out a winform dlg in a console or windows service?

Aaron_Fischer_5618 · Answer

It turns out the key thing is to a[STAThread] to the Main function.

    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Microsoft.Web.WebView2.WinForms.WebView2 webView21 = new Microsoft.Web.WebView2.WinForms.WebView2();

            var ecwTask = webView21.EnsureCoreWebView2Async(null);
            while (ecwTask.IsCompleted == false)
            {
                Application.DoEvents();
            };

            var scriptText = @"var test = function(){ return 'apple';}; test();";
            var srunTask = webView21.ExecuteScriptAsync(scriptText);
            while (srunTask.IsCompleted == false)
            {
                Application.DoEvents();
            };

            Console.WriteLine(srunTask.Result);
}
}

Other items that maybe note worthy,

Sometimes you need to set the bitness of the application because use of AnyCPU will cause an infanite wait when creating the webview2 COM object.
You may need to set the webview2 source property to foce the instance into existance.

How do I use WebView2 in a console application

1 Answers