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化零为整WCF(10) - 实例模型(InstanceContextMode)
作者：webabcd
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
{
/// <summary>
/// 演示实例模型的接口（PerCall）
/// </summary> [ServiceContract] public interface IPerCallMode { /// <summary> /// 获取计数器结果 /// </summary> /// <returns></returns> [OperationContract] int Counter(); } /// <summary> /// 演示实例模型的类（PerCall） /// </summary> /// <remarks> /// 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。 /// </remarks> [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class PerCallMode : IPerCallMode { private int _counter; /// <summary> /// 获取计数器结果 /// </summary> /// <returns></returns> public int Counter() { _counter++; return _counter; } }
}PerSessionMode.cs
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ServiceModel;namespace WCF.ServiceLib.InstanceMode{ /// <summary> /// 演示实例模型的接口（PerSession） /// </summary> [ServiceContract()] public interface IPerSessionMode { /// <summary> /// 获取计数器结果 /// </summary> /// <returns></returns> [OperationContract] int Counter(); } /// <summary> /// 演示实例模型的类（PerCall） /// </summary> /// <remarks> /// InstanceContextMode - 获取或设置指示新服务对象何时创建的值。 /// 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 /// </remarks> [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)] public class PerSessionMode : IPerSessionMode { private int _counter; /// <summary> /// 获取计数器结果 /// </summary> /// <returns></returns> public int Counter() { _counter++; return _counter; } }}SingleMode.cs
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ServiceModel;namespace WCF.ServiceLib.InstanceMode{ /// <summary> /// 演示实例模型的接口（Single） /// </summary> [ServiceContract] public interface ISingleMode { /// <summary> /// 获取计数器结果 /// </summary> /// <returns></returns> [OperationContract] int Counter(); } /// <summary> /// 演示实例模型的接口（Single） /// </summary> /// <remarks> /// InstanceContextMode - 获取或设置指示新服务对象何时创建的值。 /// 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。 /// </remarks> [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] public class SingleMode : ISingleMode { private int _counter; /// <summary> /// 获取计数器结果 /// </summary> /// <returns></returns> public int Counter() { _counter++; return _counter; } }}2、宿主
PerCallMode.svc
<%@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.InstanceMode.PerCallMode" %>PerSessionMode.svc
<%@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.InstanceMode.PerSessionMode" %>SingleMode.svc
<%@ ServiceHost Language="C#" Debug="true" Service="WCF.ServiceLib.InstanceMode.SingleMode" %>Web.config
<?xml version="1.0"?><configuration> <system.serviceModel> <behaviors> <serviceBehaviors> <behavior name="InstanceModeBehavior"> <!--httpGetEnabled - 使用get方式提供服务--> <serviceMetadata httpGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> </behaviors> <services> <!--name - 提供服务的类名--> <!--behaviorConfiguration - 指定相关的行为配置--> <service name="WCF.ServiceLib.InstanceMode.PerCallMode" behaviorConfiguration="InstanceModeBehavior"> <!--address - 服务地址--> <!--binding - 通信方式--> <!--contract - 服务契约--> <endpoint address="" binding="basicHttpBinding" contract="WCF.ServiceLib.InstanceMode.IPerCallMode" /> </service> <service name="WCF.ServiceLib.InstanceMode.PerSessionMode" behaviorConfiguration="InstanceModeBehavior"> <!--bindingConfiguration - 指定相关的绑定配置--> <endpoint address="" binding="wsHttpBinding" contract="WCF.ServiceLib.InstanceMode.IPerSessionMode" bindingConfiguration="PerSessionModeBindingConfiguration"/> </service> <service name="WCF.ServiceLib.InstanceMode.SingleMode" behaviorConfiguration="InstanceModeBehavior"> <endpoint address="" binding="basicHttpBinding" contract="WCF.ServiceLib.InstanceMode.ISingleMode" /> </service> </services> <bindings> <wsHttpBinding> <!--wsHttpBinding 可提供 安全会话 和 可靠会话--> <binding name="PerSessionModeBindingConfiguration"> <!--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。--> <reliableSession enabled="true"/> <security> <!--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。--> <message establishSecurityContext="true"/> </security> </binding> </wsHttpBinding> </bindings> </system.serviceModel></configuration>3、客户端
Hello.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Hello.aspx.cs" Inherits="InstanceMode_Hello" Title="实例模型(InstanceContextMode)" %><asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server"></asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"> <asp:Button ID="btnPerCallMode" runat="server" Text="PerCallMode" onclick="btnPerCallMode_Click" /> <asp:Button ID="btnPerSessionMode" runat="server" Text="PerSessionMode" onclick="btnPerSessionMode_Click" /> <asp:Button ID="btnSingleMode" runat="server" Text="SingleMode" onclick="btnSingleMode_Click" /></asp:Content>Hello.aspx.cs
using System;using System.Collections;using System.Configuration;using System.Data;using System.Linq;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(); Page.ClientScript.RegisterStartupScript( this.GetType(), "js", string.Format("alert('计数器：{0}')", (Session["proxy"] as InstanceModeSvc.PerSessionMode.PerSessionModeClient).Counter()), true); } protected void btnSingleMode_Click(object sender, EventArgs e) { var proxy = new InstanceModeSvc.SingleMode.SingleModeClient(); Page.ClientScript.RegisterStartupScript( this.GetType(), "js", string.Format("alert('计数器：{0}')", proxy.Counter()), true); proxy.Close(); }}Web.config
<?xml version="1.0"?><configuration> <system.serviceModel> <client> <!--address - 服务地址--> <!--binding - 通信方式--> <!--contract - 服务契约--> <endpoint address="http://localhost:3502/ServiceHost/InstanceMode/PerCallMode.svc" binding="basicHttpBinding" contract="InstanceModeSvc.PerCallMode.IPerCallMode" /> <!--bindingConfiguration - 指定相关的绑定配置--> <endpoint address="http://localhost:3502/ServiceHost/InstanceMode/PerSessionMode.svc" binding="wsHttpBinding" contract="InstanceModeSvc.PerSessionMode.IPerSessionMode" bindingConfiguration="PerSessionModeBindingConfiguration" /> <endpoint address="http://localhost:3502/ServiceHost/InstanceMode/SingleMode.svc" binding="basicHttpBinding" contract="InstanceModeSvc.SingleMode.ISingleMode" /> </client> <bindings> <wsHttpBinding> <binding name="PerSessionModeBindingConfiguration"> <!--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。--> <reliableSession enabled="true"/> <security> <!--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。--> <message establishSecurityContext="true"/> </security> </binding> </wsHttpBinding> </bindings> </system.serviceModel></configuration>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
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