blocks|key|1584776|text|好吧，这可能有点棘手，因为调用WCF服务的首选方式是在“每次调用”的基础上，例如，你实际上没有任何“启动”的东西，然后只是闲逛，真的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1584777|如果您在IIS或WAS中托管您的服务，它甚至是服务主机的“按需加载”-当消息到达时，主机将被实例化并处理请求。|1584778|如果你自己托管，你要么有一个控制台，要么有Winforms应用程序--所以你可以连接到那里，知道它们什么时候启动。如果您有一个Windows服务来托管您的服务主机，那么您很可能会覆盖ServiceBase类-->钩子上的OnStart和OnStop方法。|1584779|问题更多的是:你到底想要实现什么？只是记录日志或者类似的东西，或者你想在内存中建立一些东西来保存？？|1584780|Marc|1584781|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Well, that might be a bit tricky since the preferred way of calling WCF services is on a "per-call" basis, e.g. you don't really have anything that's "started" and then just hangs around, really.

If you're hosting your service in IIS or WAS, it's even "on-demand loading" of your service host - when a message arrives, the host is instantiated and handles the request.

If you self-host, you either have a console or Winforms app - so you could hook into there to know when they start. If you have a Windows service to host your service host, you most likely override the OnStart and OnStop methods on the ServiceBase class --> hook into there.

The question is more: what exactly are you trying to accomplish? Just logging or something like that, or do you want to have something built up in memory to stick around??

Marc

blocks|key|1369549|text|因为它只是一个类，所以你可以使用一个静态构造函数，它将在第一次使用该类型时被调用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369550|public+Service+:+IContract
{
++++public+Service(){+//+regular+constructor+}
++++static+Service(){+//+Only+called+first+time+it's+used.+}
}|code-block|syntax|javascript|1369551|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Since it's just a class, you can use a static constructor which will be called the first time the Type is used.

<pre><code>public Service : IContract
{
 public Service(){ // regular constructor }
 static Service(){ // Only called first time it's used. }
}
</code></pre>

blocks|key|1584953|text|您始终可以手动将global.asax文件添加到您的WCF服务应用程序中，因为它托管在IIS上并与ASP.NET管道集成：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1584954|<%25@+Application+Codebehind="Global.asax.cs"+Inherits="WcfApplication"+Language="C#"+%25>

public+class+WcfApplication+:+HttpApplication
{
++++protected+void+Application_Start()
++++{
++++}
}|code-block|syntax|javascript|1584955|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can always manually add global.asax files to your WCF Service Application as it hosted on IIS and integrates with ASP.NET pipeline:

<pre><code>&lt;%@ Application Codebehind="Global.asax.cs" Inherits="WcfApplication" Language="C#" %&gt;

public class WcfApplication : HttpApplication
{
 protected void Application_Start()
 {
 }
}
</code></pre>

blocks|key|1369748|text|如果你有一个自托管的WCF服务，你可以在服务的打开中添加一个事件，在这个事件中你可以分配一个静态变量，就像这篇文章一样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1369749|//Static+Variables+in+a+WCF+Service
public+class+Post2331848
{
++++[ServiceContract]
++++public+interface+ITest
++++{
++++++++[OperationContract]++++
++++++++string+GetString();
++++}++++

++++public+class+Service+:+ITest
++++{
++++++++public+static+string+TheString;+
++++++++public+string+GetString()
++++++++{
++++++++++++return+TheString;
++++++++}
++++}

++++static+void+host_Opening(object+sender,+EventArgs+e)
++++{
++++++++Service.TheString+=+"This+is+the+original+string";
++++}+

++++public+static+void+Test()+
++++{
++++++++string+baseAddress+=+"http://"+%2B+Environment.MachineName+%2B+":8000/Service";+
++++++++ServiceHost+host+=+new+ServiceHost(typeof(Service),+new+Uri(baseAddress));+
++++++++ServiceEndpoint+endpoint+=+host.AddServiceEndpoint(typeof(ITest),+new+BasicHttpBinding(),+"");+

++++++++//This+is+the+magic+line!
++++++++host.Opening+%2B=+new+EventHandler(host_Opening);

++++++++host.Open();

++++++++Console.WriteLine("Host+opened");+
++++++++Console.ReadLine();
++++++++host.Close();
++++}
}|code-block|syntax|javascript|1369750|(原文来自http://www.eggheadcafe.com/community/aspnet/18/10162637/help-in-maintain-global-variable-in-wcf.aspx)|offset|length|1369751|祝好运!|1369752|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eggheadcafe.com/community/aspnet/18/10162637/help-in-maintain-global-variable-in-wcf.aspx^0|0|0|5|2S|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

If you have a Self-Hosted WCF Service, you can add an Event to the Opening of the service, and inside this Event you can assign a static variable, just like this post:

<pre><code>//Static Variables in a WCF Service
public class Post2331848
{
 [ServiceContract]
 public interface ITest
 {
 [OperationContract] 
 string GetString();
 } 

 public class Service : ITest
 {
 public static string TheString; 
 public string GetString()
 {
 return TheString;
 }
 }

 static void host_Opening(object sender, EventArgs e)
 {
 Service.TheString = "This is the original string";
 } 

 public static void Test() 
 {
 string baseAddress = "http://" + Environment.MachineName + ":8000/Service"; 
 ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress)); 
 ServiceEndpoint endpoint = host.AddServiceEndpoint(typeof(ITest), new BasicHttpBinding(), ""); 

 //This is the magic line!
 host.Opening += new EventHandler(host_Opening);

 host.Open();

 Console.WriteLine("Host opened"); 
 Console.ReadLine();
 host.Close();
 }
}
</code></pre>

(Originaly from <a href="http://www.eggheadcafe.com/community/aspnet/18/10162637/help-in-maintain-global-variable-in-wcf.aspx" rel="noreferrer">http://www.eggheadcafe.com/community/aspnet/18/10162637/help-in-maintain-global-variable-in-wcf.aspx</a>)

Good Luck!

blocks|key|1584831|text|Imports+System.ServiceModel
Imports+System.ServiceModel.Description

Public+Class+MyServiceHost
+++Inherits+Attribute
++++Implements+IServiceBehavior

++++Public+Sub+AddBindingParameters(serviceDescription+As+System.ServiceModel.Description.ServiceDescription,+serviceHostBase+As+System.ServiceModel.ServiceHostBase,+endpoints+As+System.Collections.ObjectModel.Collection(Of+System.ServiceModel.Description.ServiceEndpoint),+bindingParameters+As+System.ServiceModel.Channels.BindingParameterCollection)+Implements+System.ServiceModel.Description.IServiceBehavior.AddBindingParameters

++++End+Sub

++++Public+Sub+ApplyDispatchBehavior(serviceDescription+As+System.ServiceModel.Description.ServiceDescription,+serviceHostBase+As+System.ServiceModel.ServiceHostBase)+Implements+System.ServiceModel.Description.IServiceBehavior.ApplyDispatchBehavior
++++++++AddHandler+serviceHostBase.Opened,+AddressOf+serviceHostBase_Opened
++++++++AddHandler+serviceHostBase.Closed,+AddressOf+serviceHostBase_Closed
++++End+Sub

++++Public+Sub+Validate(serviceDescription+As+System.ServiceModel.Description.ServiceDescription,+serviceHostBase+As+System.ServiceModel.ServiceHostBase)+Implements+System.ServiceModel.Description.IServiceBehavior.Validate

++++End+Sub




#Region+"Event+Handlers"


++++Private+Sub+serviceHostBase_Opened(ByVal+sender+As+Object,+ByVal+e+As+EventArgs)



++++End+Sub

++++Private+Sub+serviceHostBase_Closed(ByVal+sender+As+Object,+ByVal+e+As+EventArgs)



++++End+Sub


#End+Region|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1584832|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Imports System.ServiceModel
Imports System.ServiceModel.Description

Public Class MyServiceHost
 Inherits Attribute
 Implements IServiceBehavior

 Public Sub AddBindingParameters(serviceDescription As System.ServiceModel.Description.ServiceDescription, serviceHostBase As System.ServiceModel.ServiceHostBase, endpoints As System.Collections.ObjectModel.Collection(Of System.ServiceModel.Description.ServiceEndpoint), bindingParameters As System.ServiceModel.Channels.BindingParameterCollection) Implements System.ServiceModel.Description.IServiceBehavior.AddBindingParameters

 End Sub

 Public Sub ApplyDispatchBehavior(serviceDescription As System.ServiceModel.Description.ServiceDescription, serviceHostBase As System.ServiceModel.ServiceHostBase) Implements System.ServiceModel.Description.IServiceBehavior.ApplyDispatchBehavior
 AddHandler serviceHostBase.Opened, AddressOf serviceHostBase_Opened
 AddHandler serviceHostBase.Closed, AddressOf serviceHostBase_Closed
 End Sub

 Public Sub Validate(serviceDescription As System.ServiceModel.Description.ServiceDescription, serviceHostBase As System.ServiceModel.ServiceHostBase) Implements System.ServiceModel.Description.IServiceBehavior.Validate

 End Sub




#Region "Event Handlers"


 Private Sub serviceHostBase_Opened(ByVal sender As Object, ByVal e As EventArgs)



 End Sub

 Private Sub serviceHostBase_Closed(ByVal sender As Object, ByVal e As EventArgs)



 End Sub


#End Region
</code></pre>

blocks|key|1584913|text|用于在Windows+Communication+Foundation+(+WCF+)中承载服务的标准WCF是ServiceHost体系结构中的扩展点。用户可以从ServiceHost派生自己的宿主类，通常是为了覆盖OnOpening，以便在打开服务之前使用ServiceDescription强制添加默认端点或修改行为。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1584914|http://msdn.microsoft.com/en-us/library/aa702697%2528v=vs.110%2529.aspx|offset|length|1584915|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/aa702697%2528v=vs.110%2529.aspx^0|0|0|1V|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

The standard ServiceHost API for hosting services in Windows Communication Foundation (WCF) is an extensibility point in the WCF architecture. Users can derive their own host classes from ServiceHost, usually to override OnOpening to use ServiceDescription to add default endpoints imperatively or modify behaviors, prior to opening the service. 

<a href="http://msdn.microsoft.com/en-us/library/aa702697%28v=vs.110%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/aa702697%28v=vs.110%29.aspx</a>

blocks|key|1585010|text|有一个名为WebActivator的nuget包，我发现它对IIS托管很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1585011|https://www.nuget.org/packages/WebActivatorEx/|offset|length|1585012|将一些程序集属性添加到WCF项目中。|1585013|[assembly:+WebActivatorEx.PreApplicationStartMethod
(
++++typeof(MyActivator),
++++"Start")
]

public+static+class+MyActivator
{
++++public+static+void+Start()
++++{
++++++++//+do+stuff+here
++++}
}|code-block|syntax|javascript|1585014|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|Z|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|C]]]]

There is a nuget package called WebActivator that I found useful for IIS hosting.

<a href="https://www.nuget.org/packages/WebActivatorEx/" rel="nofollow">https://www.nuget.org/packages/WebActivatorEx/</a>

You add some assembly attributes to your WCF project.

<pre><code>[assembly: WebActivatorEx.PreApplicationStartMethod
(
 typeof(MyActivator),
 "Start")
]

public static class MyActivator
{
 public static void Start()
 {
 // do stuff here
 }
}
</code></pre>

What is the best way to get notified when a WCF service is first started?

Is there something similar to the Application_Start method in the Global.asax for an ASP.NET application?

WCF application start event

当WCF服务首次启动时，获得通知的最佳方式是什么？Global.asax中是否有类似于ASP.NET应用程序的Application_Start方法？

问WCF应用程序启动事件
EN

回答 7

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