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
{
    /**//// <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" />
    &nbsp;
    <asp:Button ID="btnPerSessionMode" runat="server" Text="PerSessionMode" 
        onclick="btnPerSessionMode_Click" />
    &nbsp;
    <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
[源码下载]