public async Task<HttpResponseMessage> Register(Registration registration)
{
// You'd also want to verify that the user in the registration is allowed to register for that tag
// Get notification hubs registrations for that "username" tag.
// Usually, you should get only 1, if we get more than one (for example, during development you make mistakes), delete all others
// The "100" parameter just represents how many registrations to return
var registrationsForUser = await hub.GetRegistrationsByTagAsync(registration.Username, 100);
bool firstRegistration = true;
bool existingRegistration = false;
foreach (var reg in registrationsForUser)
{
if (firstRegistration)
{
// Update the registration with the incoming channel
var winReg = reg as WindowsRegistrationDescription;
winReg.ChannelUri = new Uri(registration.Channel);
winReg.Tags = new HashSet<string> { registration.Username };
await hub.UpdateRegistrationAsync(winReg);
firstRegistration = false;
existingRegistration = true;
}
else
{
// Delete other registrations for that user
await hub.DeleteRegistrationAsync(reg);
}
}
// Register with the notification hub and listen to the "username" tag, if this is a new registration
if (!existingRegistration)
{
switch (registration.Platform)
{
case "WindowsStore":
await hub.CreateWindowsNativeRegistrationAsync(registration.Channel, new List<string> { registration.Username });
break;
default:
// If the platform isn't supported, return Bad Request
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, registration.Platform + " platform is not supported.");
}
}
return Request.CreateResponse(HttpStatusCode.OK);
}
private async void registerButton_Click(object sender, RoutedEventArgs e)
{
// Disable button
registerButton.IsEnabled = false;
yourUsernameTextBox.IsEnabled = false;
// Obtain a channel
var channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
channel.PushNotificationReceived += channel_PushNotificationReceived;
var registration = new Registration
{
Username = yourUsernameTextBox.Text,
Channel = channel.Uri,
Platform = "WindowsStore"
};
// Call our server to register this channel
using (var httpClient = new HttpClient())
{
var serializedBody = JsonConvert.SerializeObject(registration);
await httpClient.PostAsync(baseUrl + "/api/chat/register", new StringContent(serializedBody, Encoding.UTF8, "application/json"));
}
// Show the messages panel
registerButton.Content = "Ok!";
messagesPanel.Visibility = Visibility.Visible;
}