Methods supporting the blog post for the Salesforce Accelerator for Windows Store Apps

AccountsPage.cs

private async void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    await GetAccessToken();
    
    // navigate to AccountsPage.xaml
    this.Frame.Navigate(typeof (AccountsPage));
}

App_SFDC.cs

public string AccessToken { get; set; }
public string RefreshToken { get; set; }
public string InstanceUrl { get; set; }

GetAccessToken.cs

private async Task GetAccessToken()
{
    var app = (Application.Current as App);
            
    var startUrl = Common.FormatAuthUrl(AuthorizationEndpointUrl, ResponseTypes.Token, ConsumerKey,
        WebUtility.UrlEncode(CallbackUrl), DisplayTypes.Popup);
    var startUri = new Uri(startUrl);
    var endUri = new Uri(CallbackUrl);

    var webAuthenticationResult =
        await Windows.Security.Authentication.Web.WebAuthenticationBroker.AuthenticateAsync(
            Windows.Security.Authentication.Web.WebAuthenticationOptions.None,
            startUri,
            endUri);

    switch (webAuthenticationResult.ResponseStatus)
    {
        case Windows.Security.Authentication.Web.WebAuthenticationStatus.Success:
            var responseData = webAuthenticationResult.ResponseData;
            var responseUri = new Uri(responseData);
            var decoder = new WwwFormUrlDecoder(responseUri.Fragment.Replace("#", "?"));

            app.AccessToken = decoder.GetFirstValueByName("access_token");
            app.RefreshToken = decoder.GetFirstValueByName("refresh_token");
            app.InstanceUrl = WebUtility.UrlDecode(decoder.GetFirstValueByName("instance_url"));

            return;

        case Windows.Security.Authentication.Web.WebAuthenticationStatus.ErrorHttp:
            throw new Exception(webAuthenticationResult.ResponseErrorDetail.ToString());

        default:
            throw new Exception(webAuthenticationResult.ResponseData);
    }
}

MainPage.cs

public MainPage()
{
    this.InitializeComponent();

    // add the page loaded event
    this.Loaded += MainPage_Loaded;
}

MainPage_Loaded.cs

private async void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    await GetAccessToken();
}

Page_Loaded_AccountsPage.cs

private async void Page_Loaded(object sender, RoutedEventArgs e)
{
    var app = (Application.Current as App);
    var client = new ForceClient(app.InstanceUrl, app.AccessToken, "v29.0");
    var accounts = await client.QueryAsync<Account>("SELECT id, name, description FROM Account");

    GridView1.ItemsSource = accounts.records;
}