asd.cs

using System;
using System.Threading.Tasks;
using Windows.UI.Xaml.Controls;

namespace POCWebViewUniversal
{
    class Auth
    {
	    private const string MainPage = "";
	    private const string LoginPage = "";
	    private const string LogoutPage = "";

	    private readonly WebView _webView = new WebView();


		public delegate void AuthHandler(Auth sender);

		public event AuthHandler OnLogin;
		public event AuthHandler OnLogout;
		public event AuthHandler OnNoAuth;

	    public string Html {
		    get { return GetHtml().Result; }
	    }

		public string Cookie
		{
			get { return GetCookie().Result; }
		}

	    public WebView WebView
	    {
		    get { return _webView; }
	    }

	    public Auth()
	    {
			_webView.Source = new Uri(LoginPage);
			_webView.NavigationCompleted += WebViewOnNavigationCompleted;
	    }

		private void WebViewOnNavigationCompleted(WebView sender, WebViewNavigationCompletedEventArgs args)
		{
			var url = sender.Source.ToString();
			if (url.Equals(MainPage))
			{
				OnLogin(this);
			}
			else if (url.Equals(LogoutPage))
			{
				OnLogout(this);
			}
			else if (url.Equals(LoginPage))
			{
				OnNoAuth(this);
			}
		}


		public async Task Login(string username, string password)
		{
			var js = "";
			js += string.Format("document.getElementById('username').value = '{0}';", username);
			js += string.Format("document.getElementById('password').value = '{0}';", password);
			js += "document.forms[0].getElementsByClassName('loginBtn')[1].click();";

			await InvokeScript(js);
		}

	    public async Task Logout()
	    {
			var js = string.Format("location.href='{0}'", LogoutPage);
			await InvokeScript(js);
	    }

	    public async Task<string> GetCookie()
		{
			var js = "document.cookie;";
			return await InvokeScript(js);
		}

		public async Task<string> GetHtml()
		{
			var js = "document.documentElement.outerHTML;";
			return await InvokeScript(js);
		}

		private async Task<string> InvokeScript(string js)
		{
			return await _webView.InvokeScriptAsync("eval", new[] { js });
		}
    }
}