.NET集成DeveloperSharp实现强大的AOP

自运转

（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！