public async Task LoadAsync(string url)
{
if (!IsReady())
{
throw new InvalidOperationException();
}
// navigate and handle LoadCompleted
var navigationTcs = new TaskCompletionSource <bool>();
System.Windows.Navigation.LoadCompletedEventHandler handler = (s, e) =>
navigationTcs.TrySetResult(true);
_browser.LoadCompleted += handler;
try
{
_browser.Navigate(url);
await navigationTcs.Task;
}
finally
{
_browser.LoadCompleted -= handler;
}
// make the content editable to check if WebBrowser shortcuts work well
dynamic doc = _browser.Document;
doc.body.firstChild.contentEditable = true;
_events.FireLoaded();
}
async void MainWindow_Loaded(object sender, RoutedEventArgs eventArg)
{
// navigate the browser
System.Windows.Navigation.LoadCompletedEventHandler loadedHandler = null;
var loadedTcs = new TaskCompletionSource <bool>();
loadedHandler = (s, e) =>
{
this.webBrowser.LoadCompleted -= loadedHandler;
loadedTcs.SetResult(true);
};
this.webBrowser.LoadCompleted += loadedHandler;
this.webBrowser.Navigate("http://localhost:81/callback.html");
await loadedTcs.Task;
// call the script method "scriptFuncAsync"
var asyncScriptTcs = new TaskCompletionSource <object>();
var oncompleted = new ScriptEventHandler((ref object returnResult, object[] args) =>
{
// we are here when the script has called us back
asyncScriptTcs.SetResult(args[0]);
});
this.webBrowser.InvokeScript("scriptFuncAsync", oncompleted);
await asyncScriptTcs.Task;
// show the result of the asyc call
dynamic result = asyncScriptTcs.Task.Result;
MessageBox.Show(result.outcome.ToString());
}
