这是一段相当长的代码，但我无法解决这个问题，虽然我不熟悉使用通知中心，但我看不出任何问题。我正在尝试使用Azure中的通知中心注册目标通知（登录用户）。注册后，会发送测试通知。
我遇到的问题是有时会将通知发送到设备，有时则不会。它主要是不是，但偶尔当我单步执行服务器上的代码时，我会在模拟器上得到通知。有一次，当我将应用程序部署到我的手机时，通知就出现在了模拟器上！我无法发现一种模式。
我的Controller类看起来像这样;
private NotificationHelper hub;
public RegisterController()
{
hub = NotificationHelper.Instance;
}
public async Task<RegistrationDescription> Post([FromBody]JObject registrationCall)
{
var obj = await hub.Post(registrationCall);
return obj;
}
辅助类（在别处使用，因此不直接在控制器中）看起来像这样;
public static NotificationHelper Instance = new NotificationHelper();
public NotificationHubClient Hub { get; set; }
// Create the client in the constructor.
public NotificationHelper()
{
var cn = "<my-cn>";
Hub = NotificationHubClient.CreateClientFromConnectionString(cn, "<my-hub>");
}
public async Task<RegistrationDescription> Post([FromBody] JObject registrationCall)
{
// Get the registration info that we need from the request.
var platform = registrationCall["platform"].ToString();
var installationId = registrationCall["instId"].ToString();
var channelUri = registrationCall["channelUri"] != null
? registrationCall["channelUri"].ToString()
: null;
var deviceToken = registrationCall["deviceToken"] != null
? registrationCall["deviceToken"].ToString()
: null;
var userName = HttpContext.Current.User.Identity.Name;
// Get registrations for the current installation ID.
var regsForInstId = await Hub.GetRegistrationsByTagAsync(installationId, 100);
var updated = false;
var firstRegistration = true;
RegistrationDescription registration = null;
// Check for existing registrations.
foreach (var registrationDescription in regsForInstId)
{
if (firstRegistration)
{
// Update the tags.
registrationDescription.Tags = new HashSet<string>() {installationId, userName};
// We need to handle each platform separately.
switch (platform)
{
case "windows":
var winReg = registrationDescription as MpnsRegistrationDescription;
winReg.ChannelUri = new Uri(channelUri);
registration = await Hub.UpdateRegistrationAsync(winReg);
break;
case "ios":
var iosReg = registrationDescription as AppleRegistrationDescription;
iosReg.DeviceToken = deviceToken;
registration = await Hub.UpdateRegistrationAsync(iosReg);
break;
}
updated = true;
firstRegistration = false;
}
else
{
// We shouldn't have any extra registrations; delete if we do.
await Hub.DeleteRegistrationAsync(registrationDescription);
}
}
// Create a new registration.
if (!updated)
{
switch (platform)
{
case "windows":
registration = await Hub.CreateMpnsNativeRegistrationAsync(channelUri,
new string[] {installationId, userName});
break;
case "ios":
registration = await Hub.CreateAppleNativeRegistrationAsync(deviceToken,
new string[] {installationId, userName});
break;
}
}
// Send out a test notification.
await SendNotification(string.Format("Test notification for {0}", userName), userName);
return registration;
最后，我的SendNotification方法就在这里;
internal async Task SendNotification(string notificationText, string tag)
{
try
{
var toast = PrepareToastPayload("<my-hub>", notificationText);
// Send a notification to the logged-in user on both platforms.
await NotificationHelper.Instance.Hub.SendMpnsNativeNotificationAsync(toast, tag);
//await hubClient.SendAppleNativeNotificationAsync(alert, tag);
}
catch (ArgumentException ex)
{
// This is expected when an APNS registration doesn't exist.
Console.WriteLine(ex.Message);
}
}
我怀疑问题出在我的手机客户端代码中，就在这里，在WebAPI登录后立即调用SubscribeToService;
public void SubscribeToService()
{
_channel = HttpNotificationChannel.Find("mychannel");
if (_channel == null)
{
_channel = new HttpNotificationChannel("mychannel");
_channel.Open();
_channel.BindToShellToast();
}
_channel.ChannelUriUpdated += async (o, args) =>
{
var hub = new NotificationHub("<my-hub>", "<my-cn>");
await hub.RegisterNativeAsync(args.ChannelUri.ToString());
await RegisterForMessageNotificationsAsync();
};
}
public async Task RegisterForMessageNotificationsAsync()
{
using (var client = GetNewHttpClient(true))
{
// Get the info that we need to request registration.
var installationId = LocalStorageManager.GetInstallationId(); // a new Guid
var registration = new Dictionary<string, string>()
{
{"platform", "windows"},
{"instId", installationId},
{"channelUri", _channel.ChannelUri.ToString()}
};
var request = new HttpRequestMessage(HttpMethod.Post, new Uri(ApiUrl + "api/Register/RegisterForNotifications"));
request.Content = new StringContent(JsonConvert.SerializeObject(registration), Encoding.UTF8, "application/json");
string message;
try
{
HttpResponseMessage response = await client.SendAsync(request);
message = await response.Content.ReadAsStringAsync();
}
catch (Exception ex)
{
message = ex.Message;
}
_registrationId = message;
}
}
任何帮助都会受到极大关注，因为我已经被困在这几天了！我知道这里有很多代码要粘贴，但它们都是相关的。 谢谢，
编辑：当用户登录并使用WebAPI进行身份验证时，将调用SubscribeToService（）方法。方法在这里;
public async Task<User> SendSubmitLogonAsync(LogonObject lo)
{
_logonObject = lo;
using (var client = GetNewHttpClient(false))
{
var logonString = String.Format("grant_type=password&username={0}&password={1}", lo.username, lo.password);
var sc = new StringContent(logonString, Encoding.UTF8);
var response = await client.PostAsync("Token", sc);
if (response.IsSuccessStatusCode)
{
_logonResponse = await response.Content.ReadAsAsync<TokenResponseModel>();
var userInfo = await GetUserInfoAsync();
if (_channel == null)
SubscribeToService();
else
await RegisterForMessageNotificationsAsync();
return userInfo;
}
// ...
}
}
答案 0 :(得分：2)
我已经解决了这个问题。对于天蓝色的通知中心来说，有很多相当糟糕的组织方法，其中只有一个有这个音符在底部;
注：
当您仍在应用中时，您将不会收到通知。 要在应用处于活动状态时收到Toast通知，您必须 处理ShellToastNotificationReceived事件。
这就是我遇到间歇性结果的原因，因为我认为如果你在应用程序中，你仍然会收到通知。这个小小的音符非常隐蔽。
答案 1 :(得分：0)
在注册/发送消息时是否使用了正确的标记/标记表达式。此外，您在何处从通知中心存储ID。当你更新频道uri时它应该被使用（它将过期）。
我建议从头开始。