微软企业库5.0 学习之路——Unity&PIAB 通过配置实现AOP

　　

      完全通过配置实现AOP的资料太少了，今天忙了好几个小时终于走通了，分享一下。

      模拟业务是：登陆，记录登陆日志。

      

// 业务接口 
public interface IStudentManage
    {
        bool Login(string userId, string userName);
    }

 public class StudentManage:IStudentManage
    {
        public StudentManage() { }
        public bool Login(string userId, string userName)
        {
            return userId == "123" && userName == "123";
        }
    }

    /// <summary>
    /// 登陆日志
    /// </summary>
    public class UserLogCallHandler : ICallHandler
    {
       /// <summary>
        ///  构造函数，此构造函数是用于Attribute调用   
        /// </summary>
        /// <param name="message"> 消息 </param>
        /// <param name="parameterName"> 参数名 </param>
        public UserLogCallHandler(string message, string parameterName)
        {
            this.Message = message;
            this.ParameterName = parameterName;
        }
  public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext)
        {
            //检查参数是否存在
            if (input == null) throw new ArgumentNullException("input");
            if (getNext == null) throw new ArgumentNullException("getNext");
            //开始拦截，此处可以根据需求编写具体业务逻辑代码

            //调用具体方法
            var result = getNext()(input, getNext);

            // 记录登陆日志
      }

        public string Message { get; set; }
        public string ParameterName { get; set; }
        private int order = 0;

        public int Order
        {
            get
            {
                return order;
            }
            set
            {
                order = value;
            }
        }
    }

　　最关键的XML配置

<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
  </configSections>

  <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
    <assembly name="UnityAOPConfig"/>
    <namespace name="UnityAOPConfig"/>

      <!--新增配置节扩展，用于下面的<interception>配置节-->
    <sectionExtension  type="Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension,
                      Microsoft.Practices.Unity.Interception.Configuration" />
    <container name="LoginContainer">
      <!--为容器增加Interception扩展，如不增加下面interception配置会报错-->
      <extension type="Interception"/>
      <interception>
        <!--增加一个名为UserLog的拦截策略，用于记录日志-->
        <policy name="UserLog">
          <!--新增MemberNameMatchingRule匹配规则，同时需要同过配置初始化匹配规则构造函数
          具体可查看Unity.InterceptionExtension.PolicyInjection.MatchRule下具体类-->
          <matchingRule name="rule1" type="MemberNameMatchingRule">
            <lifetime type="singleton"/>
            <constructor>
              <param name="nameToMatch" value="Login"/>
            </constructor>
          </matchingRule>
          <!--增加调用处理程序，这边指定的是我自定义的UserLogCallHandler-->
          <!--同样也需要初始化构造函数-->
          <callHandler name="handler1"
                       type="UserLogCallHandler">
            <lifetime type="singleton"/>
            <constructor>
              <param name="message" type="System.String" value="登录成功！">
              </param>
              <param name="parameterName" type="System.String" value=" ">
              </param>
            </constructor>
          </callHandler>
        </policy>
      </interception>
      <!--注册对象关系，需要注意的是需要为这个注册增加TransparentProxyInterceptor的拦截器-->
      <register type="IStudentManage" mapTo="StudentManage">
        <interceptor type="TransparentProxyInterceptor" />
        <interceptionBehavior type="PolicyInjectionBehavior" />
      </register>
    </container>
  </unity>
</configuration>

　　前台调用代码

  public static IUnityContainer GetIUnityContainer(string nodeName)
        {
            //根据文件名获取指定config文件
            var fileMap = new ExeConfigurationFileMap { ExeConfigFilename = "Web.config" };
            //从config文件中读取配置信息
            Configuration configuration =
                ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
            var unitySection = (UnityConfigurationSection)configuration.GetSection("unity");

            var container = new UnityContainer().LoadConfiguration(unitySection, nodeName);
            return container;
        }
 protected void btnSubmit_Click(object sender, EventArgs e)
        {
            IUnityContainer container = new UnityContainer().LoadConfiguration("LoginContainer");

            IStudentManage studentBll = container.Resolve<IStudentManage>();
            if (studentBll.Login(txtUid.Text.Trim(), txtPwd.Text.Trim()))
            {
                if (string.IsNullOrEmpty(Request.QueryString["returnUrl"]) == false)
                {
                    Response.Redirect(Request.QueryString["returnUrl"]);
                }
                else
                {
                    Response.Redirect("~/Default.aspx");
                }
            }
            else
            {
                ltMsg.Text = "用户名或密码不正确,请重试!";
            }
        }
    }