C#实现自动化Log日志

ゝ一世哀愁。 2023-07-17 06:24 11阅读 0赞

在开发项目的时候，我们不免要使用Log记录日志，使用最多的是Log4Net和EntLib Log，在需要记录日志的代码处加入log.Write(日志信息)，假设我需要跟踪业务方法，记录方法的传递参数，执行时间，返回数据等；或者我需要查看方法的调用关系，希望进入方法的时候自动记录参数信息，出方法时记录结果和执行时间信息。这时就是一个典型的AOP运用，Java在AOP方面是很容易实现的，因为java有类加载器。但是.Net在AOP方面就不怎么容易，严格意义上.Net没有真正的AOP。这话并不代表.Net不能实现AOP，比如：PostSharp和Enterprise library就能实现。

先介绍一下PostSharp，我们知道.net代码将编译成MSIL（微软中间语言），然后CPU将MSIL的exe文件生成本地CPU的二进制文件格式，PostSharp就是在编译过程中加入IL代码，因而完成AOP功能。  
缺点：编译器需要PostSharp组件，维护代码困难，因为IL代码不好识别；  
优点：使用方便（PostSharp2是收费版，破解也比较方便，在此不介绍破解）

这里我重点介绍如何使用Enterprise Library实现自动化Log。  
1.首先我们需要下载Enterprise Library，最新为5.0版本；  
2.新建一个控制台项目，并添加以下程序集  
Microsoft.Practices.EnterpriseLibrary.Common  
Microsoft.Practices.EnterpriseLibrary.Logging  
Microsoft.Practices.EnterpriseLibrary.PolicyInjection  
Microsoft.Practices.ServiceLocation  
Microsoft.Practices.Unity  
Microsoft.Practices.Unity.Interception  
3.添加AutoLogCallHandler类，实现ICallHandler接口  
这个类是执行调用目标方法，在调用目标方法前获取方法的参数信息，并用EntLib Log记录日志；  
方法结束后，再次记录日志，并统计执行时间和异常处理

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1.  using System;
2.  using System.Collections.Generic;
3.  using System.Linq;
4.  using System.Text;
5.  using Microsoft.Practices.Unity.InterceptionExtension;
6.  using Microsoft.Practices.EnterpriseLibrary.Logging;
7.  using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
8.  using System.Diagnostics;
9.  using System.Reflection;
10. 
11. namespace AutoLog \{
12. public class AutoLogCallHandler:ICallHandler \{
13. 
14. private LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
15. 
16. public AutoLogCallHandler() \{ \}
17. 
18. public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) \{
19. StringBuilder sb = null;
20. ParameterInfo pi = null;
21. 
22. string methodName = input.MethodBase.Name;
23. logWriter.Write(string.Format("Enter method " \+ methodName));
24. 
25. 
26. if (input.Arguments != null && input.Arguments.Count > 0) \{
27. sb = new StringBuilder();
28. for (int i = 0; i < input.Arguments.Count; i++) \{
29. pi = input.Arguments.GetParameterInfo(i);
30. sb.Append(pi.Name).Append(" : ").Append(input.Arguments\[i\]).AppendLine();
31. \}
32. logWriter.Write(sb.ToString());
33. \}
34. 
35. 
36. Stopwatch sw = new Stopwatch();
37. sw.Start();
38. 
39. IMethodReturn result = getNext()(input, getNext);
40. //如果发生异常则，result.Exception != null 
41. if (result.Exception != null) \{
42. logWriter.Write("Exception:" \+ result.Exception.Message);
43. //必须将异常处理掉，否则无法继续执行 
44. result.Exception = null;
45. \}
46. 
47. sw.Stop();
48. logWriter.Write(string.Format("Exit method \{0\}, use \{1\}.",methodName, sw.Elapsed));
49. 
50. return result;
51. \}
52. 
53. public int Order \{ get; set; \}
54. \}
55. \}

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Practices.Unity.InterceptionExtension;
    using Microsoft.Practices.EnterpriseLibrary.Logging;
    using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
    using System.Diagnostics;
    using System.Reflection;
    
    namespace AutoLog {
    	public class AutoLogCallHandler:ICallHandler {
    
    		private LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
    
    		public AutoLogCallHandler() { }
    
    		public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) {
    			StringBuilder sb = null;
    			ParameterInfo pi = null;
    
    			string methodName = input.MethodBase.Name;
    			logWriter.Write(string.Format("Enter method " + methodName));
    
    
    			if (input.Arguments != null && input.Arguments.Count > 0) {
    				sb = new StringBuilder();
    				for (int i = 0; i < input.Arguments.Count; i++) {
    					pi = input.Arguments.GetParameterInfo(i);
    					sb.Append(pi.Name).Append(" : ").Append(input.Arguments[i]).AppendLine();
    				}
    				logWriter.Write(sb.ToString());
    			}		
    			
    
    			Stopwatch sw = new Stopwatch();
    			sw.Start();
    
    			IMethodReturn result = getNext()(input, getNext);
    			//如果发生异常则，result.Exception != null
    			if (result.Exception != null) {
    				logWriter.Write("Exception:" + result.Exception.Message);
    				//必须将异常处理掉，否则无法继续执行
    				result.Exception = null;
    			}
    
    			sw.Stop();
    			logWriter.Write(string.Format("Exit method {0}, use {1}.",methodName, sw.Elapsed));
    
    			return result;
    		}
    
    		public int Order { get; set; }
    	}
    }

4.要自动化日志就需要创建一个标记属性，指定方法能自动进行日志  
这里就创建AutoLogCallHandlerAttribute标记属性

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5.创建实体类  
注意：我在Work和ToString方法上方加上了AutoLogCallHandler属性，它是AutoLogCallHandlerAttribute的简写形式。用以指示这两个方法用AutoLogCallHandler的Invoke来处理。

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1.  using System;
2.  using System.Collections.Generic;
3.  using System.Linq;
4.  using System.Text;
5.  using Microsoft.Practices.Unity;
6.  
7.  namespace AutoLog \{
8.  
9.  public class Employee : MarshalByRefObject
10. \{
11. 
12. public Employee() \{\}
13. 
14. public string Name \{ get; set; \}
15. 
16. \[AutoLogCallHandler()\]
17. public void Work() \{
18. Console.WriteLine("Now is \{0\},\{1\} is working hard!",DateTime.Now.ToShortTimeString(),Name);
19. throw new Exception("Customer Exception");
20. \}
21. 
22. \[AutoLogCallHandler()\]
23. public override string ToString() \{
24. return string.Format("I'm \{0\}.",Name);
25. \}
26. \}
27. \}

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Practices.Unity;
    
    namespace AutoLog {
    
    	public class Employee : MarshalByRefObject 
    	{
    		
    		public Employee() {}
    
    		public string Name { get; set; }
    
    		[AutoLogCallHandler()]
    		public void Work() {
    			Console.WriteLine("Now is {0},{1} is working hard!",DateTime.Now.ToShortTimeString(),Name);
    			throw new Exception("Customer Exception");
    		}
    
    		[AutoLogCallHandler()]
    		public override string ToString() {
    			return string.Format("I'm {0}.",Name);
    		}
    	}
    }

6.测试代码  
注意：必须使用PolicyInjection.Create<Employee>()来创建对象，不然无法实现。

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1.  using System;
2.  using System.Collections.Generic;
3.  using System.Linq;
4.  using System.Text;
5.  using Microsoft.Practices.EnterpriseLibrary.PolicyInjection;
6.  using Microsoft.Practices.Unity;
7.  using Microsoft.Practices.EnterpriseLibrary.Logging;
8.  using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
9.  
10. namespace AutoLog \{
11. class Program \{
12. 
13. private static LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
14. 
15. static void Main(string\[\] args) \{
16. 
17. 
18. Employee emp = PolicyInjection.Create<Employee>();
19. 
20. emp.Name = "Lele";
21. 
22. emp.Work();
23. Console.WriteLine(emp);
24. \}
25. \}
26. \}

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Practices.EnterpriseLibrary.PolicyInjection;
    using Microsoft.Practices.Unity;
    using Microsoft.Practices.EnterpriseLibrary.Logging;
    using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
    
    namespace AutoLog {
    	class Program {
    
    		private static LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
    
    		static void Main(string[] args) {
    
    
    			Employee emp = PolicyInjection.Create<Employee>();
    
    			emp.Name = "Lele";
    
    			emp.Work();
    			Console.WriteLine(emp);
    		}
    	}
    }

7.还需要用EntLib的配置工具完成Log配置，将Log信息写入Trace.log文件中

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1.  <?xml version="1.0"?>
2.  <configuration>
3.  <configSections>
4.  <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
5.  </configSections>
6.  <loggingConfiguration name="" tracingEnabled="true" defaultCategory="General">
7.  <listeners>
8.  <add name="Flat File Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
9.  listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
10. fileName="trace.log" formatter="Text Formatter" />
11. </listeners>
12. <formatters>
13. <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
14. template="Timestamp: \{timestamp\}\{newline\}
15. Message: \{message\}\{newline\}
16. Category: \{category\}\{newline\}
17. Priority: \{priority\}\{newline\}
18. EventId: \{eventid\}\{newline\}
19. Severity: \{severity\}\{newline\}
20. Title:\{title\}\{newline\}
21. Machine: \{localMachine\}\{newline\}
22. App Domain: \{localAppDomain\}\{newline\}
23. ProcessId: \{localProcessId\}\{newline\}
24. Process Name: \{localProcessName\}\{newline\}
25. Thread Name: \{threadName\}\{newline\}
26. Win32 ThreadId:\{win32ThreadId\}\{newline\}
27. Extended Properties: \{dictionary(\{key\} - \{value\}\{newline\})\}"
28. name="Text Formatter" />
29. </formatters>
30. <categorySources>
31. <add switchValue="All" name="General">
32. <listeners>
33. <add name="Flat File Trace Listener" />
34. </listeners>
35. </add>
36. </categorySources>
37. <specialSources>
38. <allEvents switchValue="All" name="All Events" />
39. <notProcessed switchValue="All" name="Unprocessed Category" />
40. <errors switchValue="All" name="Logging Errors & Warnings">
41. <listeners>
42. <add name="Flat File Trace Listener" />
43. </listeners>
44. </errors>
45. </specialSources>
46. </loggingConfiguration>
47. <startup>
48. <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
49. </startup>
50. </configuration>

<?xml version="1.0"?>
    <configuration>
        <configSections>
            <section name="loggingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.LoggingSettings, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="true" />
        </configSections>
        <loggingConfiguration name="" tracingEnabled="true" defaultCategory="General">
            <listeners>
                <add name="Flat File Trace Listener" type="Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.FlatFileTraceListener, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                    listenerDataType="Microsoft.Practices.EnterpriseLibrary.Logging.Configuration.FlatFileTraceListenerData, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                    fileName="trace.log" formatter="Text Formatter" />
            </listeners>
            <formatters>
                <add type="Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.TextFormatter, Microsoft.Practices.EnterpriseLibrary.Logging, Version=5.0.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
                    template="Timestamp: {timestamp}{newline}
    Message: {message}{newline}
    Category: {category}{newline}
    Priority: {priority}{newline}
    EventId: {eventid}{newline}
    Severity: {severity}{newline}
    Title:{title}{newline}
    Machine: {localMachine}{newline}
    App Domain: {localAppDomain}{newline}
    ProcessId: {localProcessId}{newline}
    Process Name: {localProcessName}{newline}
    Thread Name: {threadName}{newline}
    Win32 ThreadId:{win32ThreadId}{newline}
    Extended Properties: {dictionary({key} - {value}{newline})}"
                    name="Text Formatter" />
            </formatters>
            <categorySources>
                <add switchValue="All" name="General">
                    <listeners>
                        <add name="Flat File Trace Listener" />
                    </listeners>
                </add>
            </categorySources>
            <specialSources>
                <allEvents switchValue="All" name="All Events" />
                <notProcessed switchValue="All" name="Unprocessed Category" />
                <errors switchValue="All" name="Logging Errors & Warnings">
                    <listeners>
                        <add name="Flat File Trace Listener" />
                    </listeners>
                </errors>
            </specialSources>
        </loggingConfiguration>
        <startup>
            <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
        </startup>
    </configuration>

好了，测试一下，控制台输入：  
Now is 14:03,Lele is working hard!  
I'm Lele.  
再看看Trace.log文件内容：

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1.  \----------------------------------------
2.  Timestamp: 2012/3/19 6:03:00
3.  
4.  Message: Enter method Work
5.  
6.  Category: General
7.  
8.  Priority: -1
9.  
10. EventId: 1
11. 
12. Severity: Information
13. 
14. Title:
15. 
16. Machine: PC4
17. 
18. App Domain: AutoLog.exe
19. 
20. ProcessId: 4200
21. 
22. Process Name: D:\\Codes\\Enterprise Library\\Enterprise Library Demos\\PIAB\\Demo\\AutoLog\\bin\\Debug\\AutoLog.exe
23. 
24. Thread Name:
25. 
26. Win32 ThreadId:4000
27. 
28. Extended Properties:
29. \----------------------------------------
30. \----------------------------------------
31. Timestamp: 2012/3/19 6:03:00
32. 
33. Message: Exception:Customer Exception
34. 
35. Category: General
36. 
37. Priority: -1
38. 
39. EventId: 1
40. 
41. Severity: Information
42. 
43. Title:
44. 
45. Machine: PC4
46. 
47. App Domain: AutoLog.exe
48. 
49. ProcessId: 4200
50. 
51. Process Name: D:\\Codes\\Enterprise Library\\Enterprise Library Demos\\PIAB\\Demo\\AutoLog\\bin\\Debug\\AutoLog.exe
52. 
53. Thread Name:
54. 
55. Win32 ThreadId:4000
56. 
57. Extended Properties:
58. \----------------------------------------
59. \----------------------------------------
60. Timestamp: 2012/3/19 6:03:00
61. 
62. Message: Exit method Work, use 00:00:00.0024272.
63. 
64. Category: General
65. 
66. Priority: -1
67. 
68. EventId: 1
69. 
70. Severity: Information
71. 
72. Title:
73. 
74. Machine: PC4
75. 
76. App Domain: AutoLog.exe
77. 
78. ProcessId: 4200
79. 
80. Process Name: D:\\Codes\\Enterprise Library\\Enterprise Library Demos\\PIAB\\Demo\\AutoLog\\bin\\Debug\\AutoLog.exe
81. 
82. Thread Name:
83. 
84. Win32 ThreadId:4000
85. 
86. Extended Properties:
87. \----------------------------------------
88. \----------------------------------------
89. Timestamp: 2012/3/19 6:03:00
90. 
91. Message: Enter method ToString
92. 
93. Category: General
94. 
95. Priority: -1
96. 
97. EventId: 1
98. 
99. Severity: Information
100. 
101. Title:
102. 
103. Machine: PC4
104. 
105. App Domain: AutoLog.exe
106. 
107. ProcessId: 4200
108. 
109. Process Name: D:\\Codes\\Enterprise Library\\Enterprise Library Demos\\PIAB\\Demo\\AutoLog\\bin\\Debug\\AutoLog.exe
110. 
111. Thread Name:
112. 
113. Win32 ThreadId:4000
114. 
115. Extended Properties:
116. \----------------------------------------
117. \----------------------------------------
118. Timestamp: 2012/3/19 6:03:00
119. 
120. Message: Exit method ToString, use 00:00:00.0001410.
121. 
122. Category: General
123. 
124. Priority: -1
125. 
126. EventId: 1
127. 
128. Severity: Information
129. 
130. Title:
131. 
132. Machine: PC4
133. 
134. App Domain: AutoLog.exe
135. 
136. ProcessId: 4200
137. 
138. Process Name: D:\\Codes\\Enterprise Library\\Enterprise Library Demos\\PIAB\\Demo\\AutoLog\\bin\\Debug\\AutoLog.exe
139. 
140. Thread Name:
141. 
142. Win32 ThreadId:4000
143. 
144. Extended Properties:
145. \----------------------------------------

----------------------------------------
    Timestamp: 2012/3/19 6:03:00
    
    Message: Enter method Work
    
    Category: General
    
    Priority: -1
    
    EventId: 1
    
    Severity: Information
    
    Title:
    
    Machine: PC4
    
    App Domain: AutoLog.exe
    
    ProcessId: 4200
    
    Process Name: D:\Codes\Enterprise Library\Enterprise Library Demos\PIAB\Demo\AutoLog\bin\Debug\AutoLog.exe
    
    Thread Name: 
    
    Win32 ThreadId:4000
    
    Extended Properties: 
    ----------------------------------------
    ----------------------------------------
    Timestamp: 2012/3/19 6:03:00
    
    Message: Exception:Customer Exception
    
    Category: General
    
    Priority: -1
    
    EventId: 1
    
    Severity: Information
    
    Title:
    
    Machine: PC4
    
    App Domain: AutoLog.exe
    
    ProcessId: 4200
    
    Process Name: D:\Codes\Enterprise Library\Enterprise Library Demos\PIAB\Demo\AutoLog\bin\Debug\AutoLog.exe
    
    Thread Name: 
    
    Win32 ThreadId:4000
    
    Extended Properties: 
    ----------------------------------------
    ----------------------------------------
    Timestamp: 2012/3/19 6:03:00
    
    Message: Exit method Work, use 00:00:00.0024272.
    
    Category: General
    
    Priority: -1
    
    EventId: 1
    
    Severity: Information
    
    Title:
    
    Machine: PC4
    
    App Domain: AutoLog.exe
    
    ProcessId: 4200
    
    Process Name: D:\Codes\Enterprise Library\Enterprise Library Demos\PIAB\Demo\AutoLog\bin\Debug\AutoLog.exe
    
    Thread Name: 
    
    Win32 ThreadId:4000
    
    Extended Properties: 
    ----------------------------------------
    ----------------------------------------
    Timestamp: 2012/3/19 6:03:00
    
    Message: Enter method ToString
    
    Category: General
    
    Priority: -1
    
    EventId: 1
    
    Severity: Information
    
    Title:
    
    Machine: PC4
    
    App Domain: AutoLog.exe
    
    ProcessId: 4200
    
    Process Name: D:\Codes\Enterprise Library\Enterprise Library Demos\PIAB\Demo\AutoLog\bin\Debug\AutoLog.exe
    
    Thread Name: 
    
    Win32 ThreadId:4000
    
    Extended Properties: 
    ----------------------------------------
    ----------------------------------------
    Timestamp: 2012/3/19 6:03:00
    
    Message: Exit method ToString, use 00:00:00.0001410.
    
    Category: General
    
    Priority: -1
    
    EventId: 1
    
    Severity: Information
    
    Title:
    
    Machine: PC4
    
    App Domain: AutoLog.exe
    
    ProcessId: 4200
    
    Process Name: D:\Codes\Enterprise Library\Enterprise Library Demos\PIAB\Demo\AutoLog\bin\Debug\AutoLog.exe
    
    Thread Name: 
    
    Win32 ThreadId:4000
    
    Extended Properties: 
    ----------------------------------------

实现了自动化Log后，回过头来再看第5步，Employee继承了MarshalByRefObject，一般我们的业务类或数据访问类都有基类，那么我们就需要使用接口  
这里我添加一个IEmployee接口，里面就Work方法（ToString是重写Object的）。

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1.  using System.Collections.Generic;
2.  using System.Linq;
3.  using System.Text;
4.  using Microsoft.Practices.Unity;
5.  
6.  namespace AutoLog \{
7.  
8.  public interface IEmployee \{
9.  void Work();
10. \}
11. 
12. public class Employee : IEmployee
13. \{
14. 
15. public Employee() \{
16. //this.Name = "Lele"; 
17. \}
18. 
19. public string Name \{ get; set; \}
20. 
21. \[AutoLogCallHandler()\]
22. public void Work() \{
23. Console.WriteLine("Now is \{0\},\{1\} is working hard!",DateTime.Now.ToShortTimeString(),Name);
24. throw new Exception("Customer Exception");
25. \}
26. 
27. \[AutoLogCallHandler()\]
28. public override string ToString() \{
29. return string.Format("I'm \{0\}.",Name);
30. \}
31. \}
32. \}

using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Practices.Unity;
    
    namespace AutoLog {
    
    	public interface IEmployee {
    		void Work();
    	}
    
    	public class Employee : IEmployee 
    	{
    		
    		public Employee() {
    			//this.Name = "Lele";
    		}
    
    		public string Name { get; set; }
    
    		[AutoLogCallHandler()]
    		public void Work() {
    			Console.WriteLine("Now is {0},{1} is working hard!",DateTime.Now.ToShortTimeString(),Name);
    			throw new Exception("Customer Exception");
    		}
    
    		[AutoLogCallHandler()]
    		public override string ToString() {
    			return string.Format("I'm {0}.",Name);
    		}
    	}
    }

然后在测试类改动一下

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1.  using System;
2.  using System.Collections.Generic;
3.  using System.Linq;
4.  using System.Text;
5.  using Microsoft.Practices.EnterpriseLibrary.PolicyInjection;
6.  using Microsoft.Practices.Unity;
7.  using Microsoft.Practices.EnterpriseLibrary.Logging;
8.  using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
9.  
10. namespace AutoLog \{
11. class Program \{
12. 
13. private static LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
14. 
15. static void Main(string\[\] args) \{
16. 
17. IEmployee emp = PolicyInjection.Create<Employee, IEmployee>();
18. 
19. emp.Work();
20. Console.WriteLine(emp);
21. \}
22. \}
23. \}

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using Microsoft.Practices.EnterpriseLibrary.PolicyInjection;
    using Microsoft.Practices.Unity;
    using Microsoft.Practices.EnterpriseLibrary.Logging;
    using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
    
    namespace AutoLog {
    	class Program {
    
    		private static LogWriter logWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
    
    		static void Main(string[] args) {
    
    			IEmployee emp = PolicyInjection.Create<Employee, IEmployee>();
    
    			emp.Work();
    			Console.WriteLine(emp);
    		}
    	}
    }

此为大牛：[http://blog.csdn.net/qing2005/article/details/7368738][http_blog.csdn.net_qing2005_article_details_7368738]

[view plain]: http://blog.csdn.net/qing2005/article/details/7368738#
[http_blog.csdn.net_qing2005_article_details_7368738]: http://blog.csdn.net/qing2005/article/details/7368738