化零为整WCF(10) - 实例模型(InstanceContextMode)

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化零为整WCF(10) - 实例模型(InstanceContextMode)

介绍

WCF(Windows Communication Foundation) - 实例模型：

    ServiceBehavior

    ·InstanceContextMode.PerCall - 新的 System.ServiceModel.InstanceContext 对象在每次调用前创建，在调用后回收。

    ·InstanceContextMode.PerSession - 为每个会话创建一个新的 System.ServiceModel.InstanceContext 对象。

    ·InstanceContextMode.Single - 只有一个 System.ServiceModel.InstanceContext 对象用于所有传入呼叫，并且在调用后不回收。如果服务对象不存在，则创建一个。

示例

1、服务

PerCallMode.cs

using System; 

using System.Collections.Generic; 

using System.Linq; 

using System.Text; 

using System.ServiceModel; 

namespace WCF.ServiceLib.InstanceMode 

{ 

        /// &lt;summary&gt; 

        /// 演示实例模型的接口（PerCall） 

        /// &lt;/summary&gt; 

        [ServiceContract] 

        public interface IPerCallMode 

        { 

                /// &lt;summary&gt; 

                /// 获取计数器结果 

                /// &lt;/summary&gt; 

                /// &lt;returns&gt;&lt;/returns&gt; 

                [OperationContract] 

                int Counter(); 

        } 

        /// 演示实例模型的类（PerCall） 

        /// &lt;remarks&gt; 

        /// InstanceContextMode - 获取或设置指示新服务对象何时创建的值。 

        /// InstanceContextMode.PerCall - 新的 System.ServiceModel.InstanceContext 对象在每次调用前创建，在调用后回收。 

        /// &lt;/remarks&gt; 

        [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] 

        public class PerCallMode : IPerCallMode 

                private int _counter; 

                public int Counter() 

                { 

                        _counter++; 

                        return _counter; 

                } 

}

PerSessionMode.cs

        /// 演示实例模型的接口（PerSession） 

        [ServiceContract()] 

        public interface IPerSessionMode 

        /// InstanceContextMode.PerSession - 为每个会话创建一个新的 System.ServiceModel.InstanceContext 对象。 

        /// InstanceContextMode 的默认值为 InstanceContextMode.PerSession 

        [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)] 

        public class PerSessionMode : IPerSessionMode 

SingleMode.cs

        /// 演示实例模型的接口（Single） 

        public interface ISingleMode 

        /// InstanceContextMode.Single - 只有一个 System.ServiceModel.InstanceContext 对象用于所有传入呼叫，并且在调用后不回收。如果服务对象不存在，则创建一个。 

        [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] 

        public class SingleMode : ISingleMode 

2、宿主

PerCallMode.svc

&lt;%@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.InstanceMode.PerCallMode" %&gt;

PerSessionMode.svc

&lt;%@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.InstanceMode.PerSessionMode" %&gt;

SingleMode.svc

&lt;%@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.InstanceMode.SingleMode" %&gt;

Web.config

&lt;?xml version="1.0"?&gt; 

&lt;configuration&gt; 

        &lt;system.serviceModel&gt; 

                &lt;behaviors&gt; 

                        &lt;serviceBehaviors&gt; 

                                &lt;behavior name="InstanceModeBehavior"&gt; 

                                        &lt;!--httpGetEnabled - 使用get方式提供服务--&gt; 

                                        &lt;serviceMetadata httpGetEnabled="true" /&gt; 

                                        &lt;serviceDebug includeExceptionDetailInFaults="true"/&gt; 

                                &lt;/behavior&gt; 

                        &lt;/serviceBehaviors&gt; 

                &lt;/behaviors&gt; 

                &lt;services&gt; 

                        &lt;!--name - 提供服务的类名--&gt; 

                        &lt;!--behaviorConfiguration - 指定相关的行为配置--&gt; 

                        &lt;service name="WCF.ServiceLib.InstanceMode.PerCallMode" behaviorConfiguration="InstanceModeBehavior"&gt; 

                                &lt;!--address - 服务地址--&gt; 

                                &lt;!--binding - 通信方式--&gt; 

                                &lt;!--contract - 服务契约--&gt; 

                                &lt;endpoint address="" binding="basicHttpBinding" contract="WCF.ServiceLib.InstanceMode.IPerCallMode" /&gt; 

                        &lt;/service&gt; 

                        &lt;service name="WCF.ServiceLib.InstanceMode.PerSessionMode" behaviorConfiguration="InstanceModeBehavior"&gt; 

                                &lt;!--bindingConfiguration - 指定相关的绑定配置--&gt; 

                                &lt;endpoint address="" binding="wsHttpBinding" contract="WCF.ServiceLib.InstanceMode.IPerSessionMode" bindingConfiguration="PerSessionModeBindingConfiguration"/&gt; 

                        &lt;service name="WCF.ServiceLib.InstanceMode.SingleMode" behaviorConfiguration="InstanceModeBehavior"&gt; 

                                &lt;endpoint address="" binding="basicHttpBinding" contract="WCF.ServiceLib.InstanceMode.ISingleMode" /&gt; 

                &lt;/services&gt; 

                &lt;bindings&gt; 

                        &lt;wsHttpBinding&gt; 

                                &lt;!--wsHttpBinding 可提供 安全会话 和 可靠会话--&gt; 

                                &lt;binding name="PerSessionModeBindingConfiguration"&gt; 

                                        &lt;!--指示是否在通道终结点之间建立 WS-RM (WS-ReliableMessaging) 可靠会话。默认值为 false。--&gt; 

                                        &lt;reliableSession enabled="true"/&gt; 

                                        &lt;security&gt; 

                                                &lt;!--此属性控制安全上下文令牌是否通过客户端与服务之间的 WS-SecureConversation 交换建立。将它设置为 true 要求远程方支持 WS-SecureConversation。--&gt; 

                                                &lt;message establishSecurityContext="true"/&gt; 

                                        &lt;/security&gt; 

                                &lt;/binding&gt; 

                        &lt;/wsHttpBinding&gt; 

                &lt;/bindings&gt; 

        &lt;/system.serviceModel&gt; 

&lt;/configuration&gt;

3、客户端

Hello.aspx

&lt;%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Hello.aspx.cs" 

        Inherits="InstanceMode_Hello" Title="实例模型(InstanceContextMode)" %&gt; 

&lt;asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server"&gt; 

&lt;/asp:Content&gt; 

&lt;asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"&gt; 

        &lt;asp:Button ID="btnPerCallMode" runat="server" Text="PerCallMode"    

                 /&gt; 

        &lt;asp:Button ID="btnPerSessionMode" runat="server" Text="PerSessionMode"    

        &lt;asp:Button ID="btnSingleMode" runat="server" Text="SingleMode"    

&lt;/asp:Content&gt;

Hello.aspx.cs

using System.Collections; 

using System.Configuration; 

using System.Data; 

using System.Web; 

using System.Web.Security; 

using System.Web.UI; 

using System.Web.UI.HtmlControls; 

using System.Web.UI.WebControls; 

using System.Web.UI.WebControls.WebParts; 

using System.Xml.Linq; 

public partial class InstanceMode_Hello : System.Web.UI.Page 

        protected void Page_Load(object sender, EventArgs e) 

        protected void btnPerCallMode_Click(object sender, EventArgs e) 

                var proxy = new InstanceModeSvc.PerCallMode.PerCallModeClient(); 

                Page.ClientScript.RegisterStartupScript( 

                        this.GetType(), 

                        "js", 

                        string.Format("alert('计数器：{0}')", proxy.Counter()), 

                        true); 

                proxy.Close(); 

        protected void btnPerSessionMode_Click(object sender, EventArgs e) 

                if (Session["proxy"] == null) 

                        Session["proxy"] = new InstanceModeSvc.PerSessionMode.PerSessionModeClient(); 

                        string.Format("alert('计数器：{0}')", (Session["proxy"] as InstanceModeSvc.PerSessionMode.PerSessionModeClient).Counter()), 

        protected void btnSingleMode_Click(object sender, EventArgs e) 

                var proxy = new InstanceModeSvc.SingleMode.SingleModeClient(); 

                &lt;client&gt; 

                        &lt;!--address - 服务地址--&gt; 

                        &lt;!--binding - 通信方式--&gt; 

                        &lt;!--contract - 服务契约--&gt; 

                        &lt;endpoint address="http://localhost:3502/ServiceHost/InstanceMode/PerCallMode.svc" binding="basicHttpBinding" contract="InstanceModeSvc.PerCallMode.IPerCallMode" /&gt; 

                        &lt;!--bindingConfiguration - 指定相关的绑定配置--&gt; 

                        &lt;endpoint address="http://localhost:3502/ServiceHost/InstanceMode/PerSessionMode.svc" binding="wsHttpBinding" contract="InstanceModeSvc.PerSessionMode.IPerSessionMode" bindingConfiguration="PerSessionModeBindingConfiguration" /&gt; 

                        &lt;endpoint address="http://localhost:3502/ServiceHost/InstanceMode/SingleMode.svc" binding="basicHttpBinding" contract="InstanceModeSvc.SingleMode.ISingleMode" /&gt; 

                &lt;/client&gt; 

运行结果：

单击"btnPerCallMode"按钮，每次单击，计数器都返回1

单击"btnPerSessionMode"按钮，每次单击并且会话相同，计数器会累加

单击"btnSingleMode"按钮，每次单击，计数器都累加

OK

<a href="http://down.51cto.com/data/100781" target="_blank">[源码下载]</a>

     本文转自webabcd 51CTO博客，原文链接：http://blog.51cto.com/webabcd/344149，如需转载请自行联系原作者