通过代码生成机制实现强类型编程-CodeSimth版

一直想写一个Code生成系列，但写到CodeSimth，发觉在TerryLee 和努力学习的小熊 两位大牛的博客里讲很详尽，所以就像写些示例方面的，但是苦于没有想到写些什么。最近Artech写了两篇从数据到代码——通过代码生成机制实现强类型编程--上篇和下篇，大牛写得是CodeDom的，今天我就想借借大牛的示例写个CodeSimth版的，希望Artech不要怪我，呵呵。我的Code生成技术已经写了CodeDom的见CodeDom系列目录，欢迎各位园友指教。

        好直接到主题。首先是数据实体MessageEntry（我到老A的基础上添加了description属性作为代码字段描述）：

代码

1 namespace Wolf 
2 { 
3 public class MessageEntry 
4     { 
5 public string Id { get; private set; } 
6 public string Value { get; private set; }        
7 public string Description { get; private set; } 
8 public MessageEntry(string id, string value) 
9         { 
10 this.Id = id; 
11 this.Value = value;         
12         } 
13
14 public MessageEntry(string id, string value, string description) 
15         { 
16 this.Id = id; 
17 this.Value = value; 
18 this.Description = description; 
19         } 
20
21 public string Format(params object[] args) 
22         { 
23 return string.Format(this.Value, args); 
24         } 
25     } 
26 }
27
28

在我的机子上的COdeSimth是2..0版本的所以不能使用Linq命名空间，我又想利用这个空间，比较快捷，所以我就在先3.0转化为

Dictionary<string, List<MessageEntry>>实体再传入模板：

Code：

代码

1 using System; 
2 using System.Collections.Generic; 
3 using System.Linq; 
4 using System.Text; 
5 using System.Xml; 
6 using System.Xml.Linq; 
7
8 namespace Wolf 
9 { 
10 public class MessageCodeGenerator 
11     { 
12 public Dictionary<string, List<MessageEntry>> GeneratorCode(string  path) 
13         { 
14 return GeneratorCode(XElement.Load(path)); 
15         } 
16 public Dictionary<string, List<MessageEntry>> GeneratorCode(XElement root) 
17         { 
18
19             var elemts = root.Elements("message").GroupBy(e => ((XAttribute)e.Attribute("category")).Value); 
20             Dictionary<string, List<MessageEntry>> dict = new Dictionary<string, List<MessageEntry>>(); 
21 foreach (var item in elemts) 
22             { 
23                 List<MessageEntry> list = new List<MessageEntry>(); 
24 foreach (var g in item) 
25                 { 
26 if (g.Attribute("description") != null) 
27                     { 
28                         list.Add(new MessageEntry(((XAttribute)g.Attribute("id")).Value, ((XAttribute)g.Attribute("value")).Value, ((XAttribute)g.Attribute("description")).Value)); 
29                     } 
30 else
31                     { 
32                         list.Add(new MessageEntry(((XAttribute)g.Attribute("id")).Value, ((XAttribute)g.Attribute("value")).Value)); 
33                     } 
34
35                 } 
36                 dict.Add(item.Key.ToString(), list); 
37             } 
38 return dict; 
39
40         } 
41     } 
42 }
43
44

这下几可开始写模板了，见下Code：

代码

1 <%@ CodeTemplate Language="C#" TargetLanguage="Text" Src="" Inherits="" Debug="False" Description="Template description here." %>
2
3 <%@ Import NameSpace="System" %>
4 <%@ Import NameSpace="System.Xml" %>
5 <%@ Import NameSpace="System.Text" %>
6 <%@ Import NameSpace="System.Collections.Generic" %>
7 <%@ Import NameSpace="Wolf" %>
8 <%@ Assembly Name="Wolf" %>
9
10 <script runat="template">
11
12 private Dictionary<string, List<MessageEntry>> dict; 
13 public Dictionary<string, List<MessageEntry>> Generator 
14 { 
15 get
16     { 
17 return dict; 
18     } 
19 set
20     { 
21         dict=value; 
22     } 
23 } 
24
25 public string GeneratorCode() 
26         {            
27 string str = "using Wolf;\r\nusing System;\r\nusing System.Collections.Generic;\r\nnamespace Wolf.Message\r\n{ \r\n   public class Messages\r\n    {\r\n"; 
28 foreach (string catage in Generator.Keys) 
29             { 
30                 str += "        public class  "+catage + "\r\n        {        \r\n"; 
31 foreach (Wolf.MessageEntry entry in Generator[catage]) 
32                 { 
33                     str += "\r\n            /// <summary>" +
34 "\r\n            ///" + entry.Description +
35 "\r\n            /// </summary>" +
36 "\r\n            public static Wolf.MessageEntry " + entry.Id + " = new MessageEntry(\"" + entry.Id + "\", \"" + entry.Value +"\", \"" + entry.Value +"\");\r\n"; 
37                 } 
38                 str += "\r\n        }\r\n\r\n"; 
39
40             } 
41             str += "\r\n    }\r\n}"; 
42 return str; 
43         } 
44
45 </script>
46 //Copyright (C) Wolf.  All rights reserved. 
47 <%=  GeneratorCode()%>
48
49

很简单，就不说了，如果有问题请留言，其中命名空间完全可以以属性方式传入。

XMl实体用的是老A的：

代码

1 <?xml version="1.0" encoding="utf-8" ?>
2 <messages>
3 <message id="MandatoryField" value="The {0} is mandatory."  category="Validation"  description="description" />
4 <message id="GreaterThan" value="The {0} must be greater than {1}."  category="Validation" description="description" />
5 <message id="ReallyDelete" value="Do you really want to delete the {0}."  category="Confirmation" description="description" />
6 </messages>
7
8

我想脱离CodeSimth工具，所以在建立了一个控制台程序，引用CodeSmith.Engine.dll程序集。

Code：

代码

1 static void Main(string[] args) 
2        { 
3 // Wolf.Message.Messages.Confirmation.ReallyDelete.Value 
4 // test(); 
5            CodeTemplate template = CompileTemplate(@"E:\MyApp\LinqTest\ConsoleApplication1\MessageCodeGenerator.cst",s=>Console.WriteLine(s)); 
6 if (template != null) 
7            { 
8                template.SetProperty("_MessageFilePath", ""); 
9                Wolf.MessageCodeGenerator gen = new MessageCodeGenerator(); 
10                Dictionary<string, List<MessageEntry>> dict = gen.GeneratorCode(@"E:\MyApp\LinqTest\ConsoleApplication1\Sample.xml"); 
11                template.SetProperty("Generator", dict); 
12                template.RenderToFile("gen.cs", true); 
13 // System.Diagnostics.Process.Start("gen.cs"); 
14            } 
15 // Console.Read(); 
16
17        }
18
19 public static CodeTemplate CompileTemplate(string templateName,Action<string> errorWriter) 
20        { 
21            CodeTemplateCompiler compiler = new CodeTemplateCompiler(templateName); 
22            compiler.Compile(); 
23
24 if (compiler.Errors.Count == 0) 
25            { 
26 return compiler.CreateInstance(); 
27            } 
28 else
29            { 
30 for (int i = 0; i < compiler.Errors.Count; i++) 
31                { 
32                    errorWriter(compiler.Errors[i].ToString()); 
33                } 
34 return null; 
35            } 
36
37        }
38
39

生成后的代码：

代码

1 //Copyright (C) Wolf.  All rights reserved. 
2 using Wolf; 
3 using System; 
4 using System.Collections.Generic; 
5 namespace Wolf.Message 
6 { 
7 public class Messages 
8     { 
9 public class Validation 
10         { 
11
12 /// <summary>
13 ///description 
14 /// </summary>
15 public static Wolf.MessageEntry MandatoryField = new MessageEntry("MandatoryField", 
16
17 "The {0} is mandatory.", "The {0} is mandatory."); 
18
19 /// <summary>
20 ///description 
21 /// </summary>
22 public static Wolf.MessageEntry GreaterThan = new MessageEntry("GreaterThan", 
23
24 "The {0} must be greater than {1}.", "The {0} must be greater than {1}."); 
25
26         } 
27
28 public class Confirmation 
29         { 
30
31 /// <summary>
32 ///description 
33 /// </summary>
34 public static Wolf.MessageEntry ReallyDelete = new MessageEntry("ReallyDelete", 
35
36 "Do you really want to delete the {0}.", "Do you really want to delete the {0}."); 
37
38         } 
39
40     } 
41 }
42
43