我目前正在开发一个C＃Web应用程序，并且我试图使用PushSharp软件包来获取推送通知。我的所有代码都在我的项目中的Global.asax文件中推送通知，但我一直收到错误：
using BYC.Models;
using BYC.Models.Enums;
using Newtonsoft.Json.Linq;
using PushSharp.Apple;
using PushSharp.Google;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;
namespace BYC
{
public class WebApiApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
GlobalConfiguration.Configure(WebApiConfig.Register);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
}
protected void Application_End()
{
PushBrokerSingleton pbs = new PushBrokerSingleton();
pbs.SendQueuedNotifications();
}
}
public sealed class PushBrokerSingleton
{
private static ApnsServiceBroker Apns { get; set; }
private static GcmServiceBroker Gcm { get; set; }
private static bool ApnsStarted = false;
private static bool GcmStarted = false;
private static object AppleSyncVar = new object();
private static object GcmSyncVar = new object();
private static readonly log4net.ILog log = log4net.LogManager.GetLogger
(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
public PushBrokerSingleton()
{
if (Apns == null)
{
string thumbprint = (AppSettings.Instance["APNS:Thumbprint"]);
X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
store.Open(OpenFlags.OpenExistingOnly | OpenFlags.ReadOnly);
ApnsConfiguration.ApnsServerEnvironment production = Convert.ToBoolean(AppSettings.Instance["APNS:Production"]) ?
ApnsConfiguration.ApnsServerEnvironment.Production : ApnsConfiguration.ApnsServerEnvironment.Sandbox;
X509Certificate2 appleCert = store.Certificates
.Cast<X509Certificate2>()
.SingleOrDefault(c => string.Equals(c.Thumbprint, thumbprint, StringComparison.OrdinalIgnoreCase));
ApnsConfiguration apnsConfig = new ApnsConfiguration(production, appleCert);
Apns = new ApnsServiceBroker(apnsConfig);
Apns.OnNotificationFailed += (notification, aggregateEx) => {
aggregateEx.Handle(ex => {
// See what kind of exception it was to further diagnose
if (ex is ApnsNotificationException)
{
var notificationException = ex as ApnsNotificationException;
// Deal with the failed notification
var apnsNotification = notificationException.Notification;
var statusCode = notificationException.ErrorStatusCode;
log.Error($"Notification Failed: ID={apnsNotification.Identifier}, Code={statusCode}");
}
else {
// Inner exception might hold more useful information like an ApnsConnectionException
log.Error($"Notification Failed for some (Unknown Reason) : {ex.InnerException}");
}
// Mark it as handled
return true;
});
};
Apns.OnNotificationSucceeded += (notification) => {
log.Info("Notification Successfully Sent to: " + notification.DeviceToken);
};
}
if(Gcm == null)
{
GcmConfiguration gcmConfig = new GcmConfiguration(AppSettings.Instance["GCM:Token"]);
Gcm = new GcmServiceBroker(gcmConfig);
}
}
public bool QueueNotification(Notification notification, Device device)
{
if (!ApnsStarted)
{
ApnsStarted = true;
lock (AppleSyncVar)
{
Apns.Start();
}
}
if(!GcmStarted)
{
GcmStarted = true;
lock (GcmSyncVar)
{
Gcm.Start();
}
}
switch (device.PlatformType)
{
case PlatformType.iOS:
return QueueApplePushNotification(notification, device.PushRegistrationToken);
case PlatformType.Android:
return QueueAndroidPushNotification(notification, device.PushRegistrationToken);
default: return false;
}
}
private bool QueueApplePushNotification(Notification notification, string pushNotificationToken)
{
string appleJsonFormat = "{\"aps\": {\"alert\":" + '"' + notification.Subject + '"' + ",\"sound\": \"default\", \"badge\": " + notification.BadgeNumber + "}}";
lock (AppleSyncVar)
{
Apns.QueueNotification(new ApnsNotification()
{
DeviceToken = pushNotificationToken,
Payload = JObject.Parse(appleJsonFormat)
});
}
return true;
}
private bool QueueAndroidPushNotification(Notification notification, string pushNotificationToken)
{
string message = "{\"alert\":\"" + notification.Subject + "\",\"badge\":" + notification.BadgeNumber + "\"}";
lock (GcmSyncVar)
{
Gcm.QueueNotification(new GcmNotification()
{
RegistrationIds = new List<string>
{
pushNotificationToken
},
Data = JObject.Parse(message),
Notification = JObject.Parse(message)
});
}
return true;
}
public void SendQueuedNotifications()
{
if(Apns != null)
{
if (ApnsStarted)
{
lock(AppleSyncVar){
Apns.Stop();
log.Info("Sent Apns Notifications");
ApnsStarted = false;
}
}
}
if(Gcm != null)
{
if (GcmStarted)
{
lock (GcmSyncVar)
{
Gcm.Stop();
log.Info("Sent Gcm Notifications");
GcmStarted = false;
}
}
}
}
}
这是我的Global.asax文件：
var mod = angular.module('app');
mod.directive('decnumber', function () {
return {
require: 'ngModel',
link: function (scope, element, attrs, modelCtrl) {
var decnumber = function (inputValue) {
if (inputValue == undefined) inputValue = "";
var formattedVal = inputValue.replace(/[^0-9]/g, "").replace(/^0+/, "");
if (formattedVal.length === 0) {
formattedVal = '0.00' + formattedVal;
} else if (formattedVal.length === 1) {
formattedVal = '0.0' + formattedVal;
} else if (formattedVal.length === 2) {
formattedVal = '0.' + formattedVal;
} else {
formattedVal = formattedVal.slice(0, -2) + '.' + formattedVal.slice(-2);
}
if (formattedVal !== inputValue) {
modelCtrl.$setViewValue(formattedVal);
modelCtrl.$render();
}
return formattedVal;
}
modelCtrl.$parsers.unshift(decnumber);
decnumber(scope[attrs.ngModel]);
}
};
});
}
答案 0 :(得分：2)
当您尝试重用已调用ApnsServiceBroker的服务代理实例（例如：Stop()）时会发生这种情况。
我猜你的Application_End在某个时刻被调用，Application_Start再次被调用，但是因为PushBrokerSingleton.Apns不是空的（它是一个静态字段所以它必须生活在虽然应用程序已停止/启动，但它永远不会被重新创建。
PushSharp很难与ASP.NET模式很好地协作，某种服务守护进程会更好。
主要问题是您的应用可能会被回收或在您不期望的时候结束。同一应用中的无关请求可能会导致您的流程失效，或者您的AppDomain可能会被拆除。如果发生这种情况并且代理的Stop()调用无法成功结束，则某些排队的消息可能会丢失。这里有一篇关于一些警告的好文章：http://haacked.com/archive/2011/10/16/the-dangers-of-implementing-recurring-background-tasks-in-asp-net.aspx/在实践中，这可能不是什么大问题，你当然可以减轻它的一部分，但要记住它。
说了这么多，我认为一个简单的解决方法是在PushBrokerSingleton.Apns中创建PushBrokerSingleton.Gcm和Application_Start的新实例。这可能会导致其他问题因此我不确定它是否是正确的修复程序，但是它可以解决在Stop()之后代理不应该重用的问题调用。
我还要考虑添加一些方法来'重置'集合。我不确定在.Stop()结束后自动执行此操作是个好主意，但我可能会考虑添加.Reset()或类似的方法来实现此目的。无论如何，现在完全可以接受创建新的代理实例。