c#动态构建代码树

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using System;using System.IO;using System.Text;using System.CodeDom;using System.CodeDom.Compiler;using System.Diagnostics;partial class HelloWorldCodeDOM{    static void Main()    {        CodeNamespace prgNamespace = BuildProgram();        var compilerOptions = new CodeGeneratorOptions()        {            IndentString = "  ",            BracingStyle = "C",            BlankLinesBetweenMembers = false        };        var codeText = new StringBuilder();        using (var codeWriter = new StringWriter(codeText))        {            CodeDomProvider.CreateProvider("c#")              .GenerateCodeFromNamespace(                prgNamespace, codeWriter, compilerOptions);        }        var script = codeText.ToString();        Console.WriteLine(script);        if (Debugger.IsAttached)            Console.ReadLine();    }}partial class HelloWorldCodeDOM{    static CodeNamespace BuildProgram()    {        var ns = new CodeNamespace("MetaWorld");        var systemImport = new CodeNamespaceImport("System");        ns.Imports.Add(systemImport);        var programClass = new CodeTypeDeclaration("Program");        ns.Types.Add(programClass);        var methodMain = new CodeMemberMethod        {            Attributes = MemberAttributes.Static,            Name = "Main"        };        methodMain.Statements.Add(            new CodeMethodInvokeExpression(                new CodeSnippetExpression("Console"),                "WriteLine",                new CodePrimitiveExpression("Hello, world!")            )        );        programClass.Members.Add(methodMain);        return ns;    }}

partial class HelloWorldCodeDOM{    //由内而外，与置顶向下设计相反（当然，下面代码可以反过来）    static CodeNamespace BuildProgram()    {        var methodMain = new CodeMemberMethod                   //定义成员方法        {            Attributes = MemberAttributes.Static,               //成员方法特性            Name = "Main"                                       //方法名        };        methodMain.Statements.Add(                              //添加成员方法的代码表达式            //构建代码表达式            new CodeMethodInvokeExpression(                new CodeSnippetExpression("Console"),                "WriteLine",                new CodePrimitiveExpression("Hello, world!")            )        );        var programClass = new CodeTypeDeclaration("Program");  //类对象        programClass.Members.Add(methodMain);        var ns = new CodeNamespace("MetaWorld");                //命名空间        ns.Imports.Add(new CodeNamespaceImport("System"));      //添加引用        ns.Types.Add(programClass);                             //添加类        //ns.Types.Add(new CodeTypeDeclaration("TestClass"));   //添加类        return ns;    }}

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