发帖
翼度科技»论坛 › 编程开发 › .net › 查看内容

.NET集成DeveloperSharp实现强大的AOP

狗蛋村书记

4

主题

4

帖子

12

积分

新手上路

Rank: 1

积分
12
显示全部楼层
（适用于.NET/.NET Core/.NET Framework）
【目录】
0.前言
1.第一个AOP程序
2.Aspect横切面编程
3.一个横切面程序拦截多个主程序
4.多个横切面程序拦截一个主程序
5.优势总结
6.展望

0.前言
AOP（Aspect Oriented Programming）是“面向横切面编程”，主要是用来对程序/模块进行解耦。怎么理解？？
我们可以把一般的编程理解为“纵向编程”(主程序)，比如如下的一个示例代码：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>public string GetInfo(int i)
  7. <?xml version="1.0" encoding="utf-8" ?>
  8. <DeveloperSharp>
  9.   <AspectObject>
  10.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  11.   </AspectObject>
  12. </DeveloperSharp>{
  13. <?xml version="1.0" encoding="utf-8" ?>
  14. <DeveloperSharp>
  15.   <AspectObject>
  16.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  17.   </AspectObject>
  18. </DeveloperSharp>    string s = "";
  20. <?xml version="1.0" encoding="utf-8" ?>
  21. <DeveloperSharp>
  22.   <AspectObject>
  23.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  24.   </AspectObject>
  25. </DeveloperSharp>    if (i == 1)
  26. <?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>s = "A";
  37. <?xml version="1.0" encoding="utf-8" ?>
  38. <DeveloperSharp>
  39.   <AspectObject>
  40.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  41.   </AspectObject>
  42. </DeveloperSharp>    else if (i == 2)
  43. <?xml version="1.0" encoding="utf-8" ?>
  44. <DeveloperSharp>
  45.   <AspectObject>
  46.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  47.   </AspectObject>
  48. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  49. <DeveloperSharp>
  50.   <AspectObject>
  51.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  52.   </AspectObject>
  53. </DeveloperSharp>s = "B";
  54. <?xml version="1.0" encoding="utf-8" ?>
  55. <DeveloperSharp>
  56.   <AspectObject>
  57.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  58.   </AspectObject>
  59. </DeveloperSharp>    else if (i == 3)
  60. <?xml version="1.0" encoding="utf-8" ?>
  61. <DeveloperSharp>
  62.   <AspectObject>
  63.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  64.   </AspectObject>
  65. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  66. <DeveloperSharp>
  67.   <AspectObject>
  68.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  69.   </AspectObject>
  70. </DeveloperSharp>s = "C";
  71. <?xml version="1.0" encoding="utf-8" ?>
  72. <DeveloperSharp>
  73.   <AspectObject>
  74.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  75.   </AspectObject>
  76. </DeveloperSharp>    else
  77. <?xml version="1.0" encoding="utf-8" ?>
  78. <DeveloperSharp>
  79.   <AspectObject>
  80.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  81.   </AspectObject>
  82. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  83. <DeveloperSharp>
  84.   <AspectObject>
  85.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  86.   </AspectObject>
  87. </DeveloperSharp>s = "Z";
  89. <?xml version="1.0" encoding="utf-8" ?>
  90. <DeveloperSharp>
  91.   <AspectObject>
  92.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  93.   </AspectObject>
  94. </DeveloperSharp>    return s;
  95. <?xml version="1.0" encoding="utf-8" ?>
  96. <DeveloperSharp>
  97.   <AspectObject>
  98.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  99.   </AspectObject>
  100. </DeveloperSharp>}
复制代码
试想一下，上述软件实际使用后，

  • 如果条件变量i有更多的判断值，我们是不是要在GetInfo()方法内部修改代码+重新编译？
  • 如果后续需要加个日志记录功能，我们是不是也要在GetInfo()方法内部加上日志函数+重新编译？
  • 如果...
  • 更多如果...
为了避免上述的这些麻烦并增加软件的灵活性，“横向编程”，也就是AOP被创造了出来，它就像是“横切一刀”，把相关功能塞进了主程序。
 
现行AOP的实现，主要是通过拦截方法(即拦截主程序)，并修改其参数+返回值来完成。
网上有很多相关方案，比如：特性注释拦截、动态代码生成、派遣代理模式、等。但这些方案要么实现的很复杂、要么耦合度没完全切断、逻辑有变化时还是需要修改少量代码重新编译。均不够理想。
而今天要隆重登场的主角-DeveloperSharp平台中的AOP技术，则提供了一种简便、快捷、彻底解耦的AOP实现。使用它，在程序逻辑有变化时，你只需要修改配置文件就行，而不再需要对主程序进行一丁丁点的代码修改！！



1.第一个AOP程序
制作一个AOP程序需要四个步骤：
（1）制作主程序
（2）制作横切面程序
（3）制作配置文件，让横切面程序拦截主程序
（4）调用主程序
下面，我们一步一步来实现上述四个步骤。
【第一步】：制作主程序
我们在Visual Studio中新建一个名为“School.Logic”的类库工程，并在该工程中新建一个名为PersonManage的类，该类中有一个名为GetInfo1的方法，代码如下：
  1. //从NuGet引用DeveloperSharp包
  2. using DeveloperSharp.Structure.Model;
  4. namespace School.Logic
  5. {
  6.     //主程序必须继承自LogicLayer类
  7.     public class PersonManage : LogicLayer
  8.     {
  9. <?xml version="1.0" encoding="utf-8" ?>
  10. <DeveloperSharp>
  11.   <AspectObject>
  12.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  13.   </AspectObject>
  14. </DeveloperSharp>public string GetInfo1(string Name, int Num)
  15. <?xml version="1.0" encoding="utf-8" ?>
  16. <DeveloperSharp>
  17.   <AspectObject>
  18.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  19.   </AspectObject>
  20. </DeveloperSharp>{
  21. <?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>    return $"共有{Name}{Num}人";
  27. <?xml version="1.0" encoding="utf-8" ?>
  28. <DeveloperSharp>
  29.   <AspectObject>
  30.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  31.   </AspectObject>
  32. </DeveloperSharp>}
  33.     }
  34. }
复制代码
以上，编写了一个非常简单的主程序。
 
【第二步】：制作横切面程序
我们再在Visual Studio中新建一个名为“School.Aspect”的类库工程，并在该工程中新建一个名为Interceptor1的类，代码如下：
  1. //从NuGet引用DeveloperSharp包
  2. using DeveloperSharp.Structure.Model.Aspect;
  4. namespace School.Aspect
  5. {
  6.     //横切面程序必须继承自AspectModel类
  7.     public class Interceptor1 : AspectModel
  8.     {
  9. <?xml version="1.0" encoding="utf-8" ?>
  10. <DeveloperSharp>
  11.   <AspectObject>
  12.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  13.   </AspectObject>
  14. </DeveloperSharp>//PreProcess方法先于主程序执行
  15. <?xml version="1.0" encoding="utf-8" ?>
  16. <DeveloperSharp>
  17.   <AspectObject>
  18.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  19.   </AspectObject>
  20. </DeveloperSharp>public override void PreProcess(object sender, AspectEventArgs e)
  21. <?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>{
  27. <?xml version="1.0" encoding="utf-8" ?>
  28. <DeveloperSharp>
  29.   <AspectObject>
  30.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  31.   </AspectObject>
  32. </DeveloperSharp>    //把主程序的两个参数值改掉
  33. <?xml version="1.0" encoding="utf-8" ?>
  34. <DeveloperSharp>
  35.   <AspectObject>
  36.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  37.   </AspectObject>
  38. </DeveloperSharp>    e.MethodInfo.ParameterValues[0] = "老师";
  39. <?xml version="1.0" encoding="utf-8" ?>
  40. <DeveloperSharp>
  41.   <AspectObject>
  42.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  43.   </AspectObject>
  44. </DeveloperSharp>    e.MethodInfo.ParameterValues[1] = 20;
  45. <?xml version="1.0" encoding="utf-8" ?>
  46. <DeveloperSharp>
  47.   <AspectObject>
  48.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  49.   </AspectObject>
  50. </DeveloperSharp>}
  52. <?xml version="1.0" encoding="utf-8" ?>
  53. <DeveloperSharp>
  54.   <AspectObject>
  55.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  56.   </AspectObject>
  57. </DeveloperSharp>//PostProcess方法后于主程序执行
  58. <?xml version="1.0" encoding="utf-8" ?>
  59. <DeveloperSharp>
  60.   <AspectObject>
  61.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  62.   </AspectObject>
  63. </DeveloperSharp>public override void PostProcess(object sender, AspectEventArgs e)
  64. <?xml version="1.0" encoding="utf-8" ?>
  65. <DeveloperSharp>
  66.   <AspectObject>
  67.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  68.   </AspectObject>
  69. </DeveloperSharp>{
  70. <?xml version="1.0" encoding="utf-8" ?>
  71. <DeveloperSharp>
  72.   <AspectObject>
  73.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  74.   </AspectObject>
  75. </DeveloperSharp>   
  76. <?xml version="1.0" encoding="utf-8" ?>
  77. <DeveloperSharp>
  78.   <AspectObject>
  79.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  80.   </AspectObject>
  81. </DeveloperSharp>}
  82.     }
  83. }
复制代码
 以上，编写了一个横切面程序。它的主要功能是把主程序方法的两个参数值给改掉。
 
【第三步】：制作配置文件，让横切面程序拦截主程序
若是在.Net Core环境下，我们创建一个名为DeveloperSharp.json的配置文件，设置让Interceptor1拦截PersonManage中的GetInfo1方法。文件内容如下：
  1. {
  2.   "DeveloperSharp":
  3.   {
  4.      "AspectObject":
  5.      [
  6. <?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp> {
  12. <?xml version="1.0" encoding="utf-8" ?>
  13. <DeveloperSharp>
  14.   <AspectObject>
  15.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  16.   </AspectObject>
  17. </DeveloperSharp>   "name":"School.Aspect.Interceptor1",  //横切面拦截器类
  18. <?xml version="1.0" encoding="utf-8" ?>
  19. <DeveloperSharp>
  20.   <AspectObject>
  21.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  22.   </AspectObject>
  23. </DeveloperSharp>   "scope":"School.Logic.PersonManage",  //被拦截的主程序类
  24. <?xml version="1.0" encoding="utf-8" ?>
  25. <DeveloperSharp>
  26.   <AspectObject>
  27.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  28.   </AspectObject>
  29. </DeveloperSharp>   "method":"GetInfo1"<?xml version="1.0" encoding="utf-8" ?>
  30. <DeveloperSharp>
  31.   <AspectObject>
  32.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  33.   </AspectObject>
  34. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  35. <DeveloperSharp>
  36.   <AspectObject>
  37.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  38.   </AspectObject>
  39. </DeveloperSharp>   //被拦截的方法
  40. <?xml version="1.0" encoding="utf-8" ?>
  41. <DeveloperSharp>
  42.   <AspectObject>
  43.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  44.   </AspectObject>
  45. </DeveloperSharp> }
  46.      ]
  47.   }
  48. }
复制代码
若是在.Net Framework环境下，我们创建一个名为DeveloperSharp.xml的配置文件，设置让Interceptor1拦截PersonManage中的GetInfo1方法。文件内容如下：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>
复制代码
注意：以上配置中所有的类名，都要用完全限定名。
 
【第四步】：调用主程序
最后，我们再在Visual Studio中创建一个控制台工程，让它来调用主程序中的GetInfo1方法，代码如下：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>//需要引用School.Aspect、School.Logic、DeveloperSharp三项<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>static void Main(string[] args)<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>    var pm = new School.Logic.PersonManage();<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>    //要用这种形式调用主程序中的方法，AOP功能才会生效<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp>    var str = pm.InvokeMethod("GetInfo1", "学生", 200);<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>    Console.WriteLine(str);<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>    Console.ReadLine();<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>}
复制代码
为了让前面第三步创建的配置文件生效，我们此时还需要在此主调项目中对它进行链接：
若是在.Net Core环境下，我们只需要把DeveloperSharp.json文件放到程序执行目录中（即bin目录下与dll、exe等文件的同一目录中，放错了位置会报错）（注意：有些.Net Core版本在Visual Studio“调试”时，不会在bin目录下生成全部的dll、exe，此时需要把此配置文件放在应用程序的“根目录”下）。
若是在.Net Framework环境下，我们需要在工程配置文件App.config/Web.config中添加appSettings节点，节点内容如下：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>
复制代码
此处需要设置为配置文件的“绝对路径”（使用“绝对路径”而不是“相对路径”，一是有利于安全性，二是有利于分布式部署）
 
一切准备完毕，运行，结果如下：
【控制台显示出】：共有老师20人
可见AOP已经拦截成功。
若此时，我们在配置文件DeveloperSharp.json/DeveloperSharp.xml中稍做修改，比如：把“GetInfo1”这个方法名改为“ABC”这样一个不存在的方法名，再运行，结果如下：
【控制台显示出】：共有学生200人
 
注意：使用DeveloperSharp平台的AOP技术，主程序类库名必须以Logic结尾（本篇为：School.Logic），横切面程序类库名必须以Aspect结尾（本篇为：School.Aspect），且这两个名字的其它部分要完全一样。这是一个特别限定条件！
 
2.Aspect横切面编程
上面，第二步，制作的横切面程序，是通过修改主程序方法的参数值，而最终改变了主程序的返回值。
其实，我们也有办法直接修改主程序方法的返回值，比如把上面Interceptor1类的代码修改为如下：
  1. //从NuGet引用DeveloperSharp包using DeveloperSharp.Structure.Model.Aspect;namespace School.Aspect{    //横切面程序必须继承自AspectModel类    public class Interceptor1 : AspectModel    {<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>//PreProcess方法先于主程序执行<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>public override void PreProcess(object sender, AspectEventArgs e)<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>}<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>//PostProcess方法后于主程序执行<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp>public override void PostProcess(object sender, AspectEventArgs e)<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>    //把主程序的返回值改掉<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>    e.MethodInfo.ReturnValue = $"共有校长2人";<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp>}    }}
复制代码
运行，结果如下：
【控制台显示出】：共有校长2人
 
到目前为止，我们已经知道了如何通过“Aspect横切面程序”修改主程序方法的参数值、返回值。
如果我们想进一步获取主程序的“命名空间”、“类名”、“方法名”、“参数名”、“参数类型”、“返回值类型”，则可以通过如下代码获取：
  1. e.MethodInfo.NamespaceName<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>       //命名空间e.MethodInfo.ClassName<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>   //类名e.MethodInfo.MethodName<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>  //方法名e.MethodInfo.ParameterInfos[0].Name<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>      //参数名（第一个参数）e.MethodInfo.ParameterInfos[0].ParameterType     //参数类型（第一个参数）e.MethodInfo.ReturnValue.GetType()<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp>       //返回值类型
复制代码
 
有时候，在某些特殊情况下，我们希望主程序方法不运行，此时则可以通过在PreProcess方法里把e.Continue设置为false来完成。
接前面的“第一个AOP程序”，比如：我们希望当人数大于10000时，主程序方法就不再运行，则可以通过把Interceptor1类的代码修改为如下样式来实现：
  1. //从NuGet引用DeveloperSharp包using DeveloperSharp.Structure.Model.Aspect;namespace School.Aspect{    //横切面程序必须继承自AspectModel类    public class Interceptor1 : AspectModel    {<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>//PreProcess方法先于主程序执行<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>public override void PreProcess(object sender, AspectEventArgs e)<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>    //当人数大于10000时，主程序方法就不再运行<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>    if (Convert.ToInt32(e.MethodInfo.ParameterValues[1]) > 10000)<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp><?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>e.Continue = false;<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>}<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>//PostProcess方法后于主程序执行<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp>public override void PostProcess(object sender, AspectEventArgs e)<?xml version="1.0" encoding="utf-8" ?>
  52. <DeveloperSharp>
  53.   <AspectObject>
  54.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  55.   </AspectObject>
  56. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  57. <DeveloperSharp>
  58.   <AspectObject>
  59.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  60.   </AspectObject>
  61. </DeveloperSharp>}    }}
复制代码
现在的这个示例是一个Aspect横切面程序拦截一个主程序。在后续将要讲解的“多个Aspect横切面程序拦截一个主程序”的情况中，只要有一个e.Continue=false被设置，主程序方法就不会运行（在此事先提点）。
 
3.一个横切面程序拦截多个主程序
为了演示这部分的内容，我们首先在前面“第一个AOP程序”的基础上，把主程序进行扩充。采取的动作是：
（1）在PersonManage类中增加一个GetInfo2方法
（2）再新增一个主程序类SystemManage，该类中有一个名为GetMessage1的方法。代码如下：
PersonManage类：
  1. //从NuGet引用DeveloperSharp包using DeveloperSharp.Structure.Model;namespace School.Logic{    //主程序必须继承自LogicLayer类    public class PersonManage : LogicLayer    {<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>public string GetInfo1(string Name, int Num)<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>    return $"共有{Name}{Num}人";<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>}<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>public string GetInfo2(string Name, int Num)<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>    return $"学校共有{Name}{Num}人";<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>}    }}
复制代码
SystemManage类：
  1. //从NuGet引用DeveloperSharp包using DeveloperSharp.Structure.Model;namespace School.Logic{    //主程序必须继承自LogicLayer类    public class SystemManage : LogicLayer    {<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>public string GetMessage1(string Name1, int Num1, string Name2, int Num2)<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>    return $"第一组共有{Name1}{Num1}人，第二组共有{Name2}{Num2}人";<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>}    }}
复制代码
如此一来，现在就有了3个主程序方法。
 
接下来，我们修改配置文件，让Interceptor1去拦截上述的3个主程序方法。
若是在.Net Core环境下，DeveloperSharp.json文件的内容修改为如下：
  1. {  "DeveloperSharp":  {     "AspectObject":     [<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp> {<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>   "name":"School.Aspect.Interceptor1",<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>    "scope":"School.Logic.PersonManage",<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>   "method":"*"   //星号*代表该作用域下的全部方法<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp> },<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp> {<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>   "name":"School.Aspect.Interceptor1",<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>    "scope":"School.Logic.SystemManage",<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>   "method":"GetMessage1"<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp> }     ]  }}
复制代码
若是在.Net Framework环境下，DeveloperSharp.xml文件的内容修改为如下：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>   
复制代码
 
 最后，我们把控制台启动程序修改为如下：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>//需要引用School.Aspect、School.Logic、DeveloperSharp三项<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>static void Main(string[] args)<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>    var pm = new School.Logic.PersonManage();<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>    var sm = new School.Logic.SystemManage();<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp>    //要用这种形式调用主程序中的方法，AOP功能才会生效<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>    var str1 = pm.InvokeMethod("GetInfo1", "学生", 200);<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>    var str2 = pm.InvokeMethod("GetInfo2", "学生", 200);<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>    var str3 = sm.InvokeMethod("GetMessage1", "学生", 200, "院士", 10);<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp>    Console.WriteLine(str1);<?xml version="1.0" encoding="utf-8" ?>
  52. <DeveloperSharp>
  53.   <AspectObject>
  54.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  55.   </AspectObject>
  56. </DeveloperSharp>    Console.WriteLine(str2);<?xml version="1.0" encoding="utf-8" ?>
  57. <DeveloperSharp>
  58.   <AspectObject>
  59.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  60.   </AspectObject>
  61. </DeveloperSharp>    Console.WriteLine(str3);<?xml version="1.0" encoding="utf-8" ?>
  62. <DeveloperSharp>
  63.   <AspectObject>
  64.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  65.   </AspectObject>
  66. </DeveloperSharp>    Console.ReadLine();<?xml version="1.0" encoding="utf-8" ?>
  67. <DeveloperSharp>
  68.   <AspectObject>
  69.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  70.   </AspectObject>
  71. </DeveloperSharp>}
复制代码
运行结果如下：
【控制台显示出】：
共有老师20人
学校共有老师20人
第一组共有老师20人，第二组共有院士10人
可见AOP所有拦截均已成功！
 
4.多个横切面程序拦截一个主程序
为了演示这部分的内容，我们还是要先回到前面的“第一个AOP程序”，在它的基础上，我们新增一个名为Interceptor2的Aspect横切面类，代码如下：
  1. //从NuGet引用DeveloperSharp包using DeveloperSharp.Structure.Model.Aspect;namespace School.Aspect{    //横切面程序必须继承自AspectModel类    public class Interceptor2 : AspectModel    {<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>//PreProcess方法先于主程序执行<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>public override void PreProcess(object sender, AspectEventArgs e)<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>    //把主程序的两个参数值改掉<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp>    e.MethodInfo.ParameterValues[0] = "辅导员";<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp>    e.MethodInfo.ParameterValues[1] = 40;<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>}<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>//PostProcess方法后于主程序执行<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>public override void PostProcess(object sender, AspectEventArgs e)<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp>{<?xml version="1.0" encoding="utf-8" ?>
  52. <DeveloperSharp>
  53.   <AspectObject>
  54.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  55.   </AspectObject>
  56. </DeveloperSharp>}    }}
复制代码
如此一来，我们就有了2个Aspect横切面程序Interceptor1与Interceptor2。
 
接下来，我们修改配置文件，让Interceptor1、Interceptor2都去拦截主程序方法GetInfo1。
若是在.Net Core环境下，DeveloperSharp.json文件的内容修改为如下：
  1. {  "DeveloperSharp":  {     "AspectObject":     [<?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp> {<?xml version="1.0" encoding="utf-8" ?>
  7. <DeveloperSharp>
  8.   <AspectObject>
  9.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  10.   </AspectObject>
  11. </DeveloperSharp>   "name":"School.Aspect.Interceptor1",<?xml version="1.0" encoding="utf-8" ?>
  12. <DeveloperSharp>
  13.   <AspectObject>
  14.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  15.   </AspectObject>
  16. </DeveloperSharp>    "scope":"School.Logic.PersonManage",<?xml version="1.0" encoding="utf-8" ?>
  17. <DeveloperSharp>
  18.   <AspectObject>
  19.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  20.   </AspectObject>
  21. </DeveloperSharp>   "method":"GetInfo1"<?xml version="1.0" encoding="utf-8" ?>
  22. <DeveloperSharp>
  23.   <AspectObject>
  24.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  25.   </AspectObject>
  26. </DeveloperSharp> },<?xml version="1.0" encoding="utf-8" ?>
  27. <DeveloperSharp>
  28.   <AspectObject>
  29.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  30.   </AspectObject>
  31. </DeveloperSharp> {<?xml version="1.0" encoding="utf-8" ?>
  32. <DeveloperSharp>
  33.   <AspectObject>
  34.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  35.   </AspectObject>
  36. </DeveloperSharp>   "name":"School.Aspect.Interceptor2",<?xml version="1.0" encoding="utf-8" ?>
  37. <DeveloperSharp>
  38.   <AspectObject>
  39.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  40.   </AspectObject>
  41. </DeveloperSharp>    "scope":"School.Logic.PersonManage",<?xml version="1.0" encoding="utf-8" ?>
  42. <DeveloperSharp>
  43.   <AspectObject>
  44.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  45.   </AspectObject>
  46. </DeveloperSharp>   "method":"GetInfo1"<?xml version="1.0" encoding="utf-8" ?>
  47. <DeveloperSharp>
  48.   <AspectObject>
  49.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  50.   </AspectObject>
  51. </DeveloperSharp> }     ]  }}
复制代码
若是在.Net Framework环境下，DeveloperSharp.xml文件的内容修改为如下：
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <DeveloperSharp>
  3.   <AspectObject>
  4.     <Ao name="School.Aspect.Interceptor1" scope="School.Logic.PersonManage" method="GetInfo1"/>
  5.   </AspectObject>
  6. </DeveloperSharp>   
复制代码
 
上述修改完毕，运行控制台主调程序，结果如下：
【控制台显示出】：共有辅导员40人
从上述运行结果，我们大致可以推断出：Interceptor1、Interceptor2这两个Aspect横切面拦截器是按配置顺序执行的。其中，Interceptor1先把GetInfo1方法的两个参数值改为了("老师",20)，接着，Interceptor2又把GetInfo1方法的两个参数值改为了("辅导员",40)，所以最终GetInfo1方法的参数值变为了("辅导员",40)。
 
5.优势总结
本文所讲述的，是全网唯一实现AOP彻底解耦的技术方案。使用它，当你需要给主程序增加Aspect横切面拦截器时，无论是增加一个还是多个，都不再需要修改&重新编译主程序。这实现了不同功能构件之间的0依赖拼装/拆卸开发方式，随之而来的也会对研发团队的管理模式产生重大影响，意义深远...
 
6.展望
AOP对于程序代码的解耦、业务模块的拆分与拼装组合，有着巨大的作用。正确的使用AOP，甚至能对传统的软件架构设计，产生颠覆性的影响，如超级战士出场一般，让所有人刮目相看，完全耳目一新！！
为了让读者能直观感知AOP的上述神奇魅力，下面给出一个业务案例：
有一批货品要录入数据库，货品包含长、宽、高、颜色、类型等属性。现在有业务需求如下，
（1）当货品长度大于10厘米时，它在数据库中标记为A类；当货品长度大于20厘米时，标记为B类。
（2）当货品颜色无法分辨时，统一在数据库中默认标记为白色。
（3）每个货品录入数据库后，还要在另一个财务数据库中录入该货品的价格信息，同时把该货品的操作员名字记入日志文件。
这样的一个业务案例，你以前会怎么设计这个程序？今天学了AOP后你又会怎么设计程序？你会创建几个Aspect横切面了...?
 
原文首发于下方公众号，请关注！
向大佬学习，探行业内幕，享时代机遇。


来源:https://www.cnblogs.com/digital-college/p/18065912
免责声明：由于采集信息均来自互联网，如果侵犯了您的权益，请联系我们【E-Mail:cb@itdo.tech】 我们会及时删除侵权内容，谢谢合作！

本帖子中包含更多资源

您需要 登录 才可以下载或查看，没有账号？立即注册

x

上一篇: .NET集成DeveloperSharp实现强大的AOP

下一篇: 【性能测试】移动测试md知识总结第1篇：移动端测试课程介绍【附代码文档】

发表于 2024-3-13 18:08:59

举报 回复 使用道具

返回列表 发新帖

Archiver|手机版|小黑屋|翼度科技

Copyright © 2001-2020, Tencent Cloud.　Powered by Discuz! X3.4