.Net拾忆：CodeDom动态源代码生成器和编译器

代码文档模型CodeDom命名空间下主要有两个，很明显第一个代码逻辑分析，第二个负责代码的编译

using System.CodeDom;
using System.CodeDom.Compiler;

 

1、CodeNamespace创建命名空间

CodeNamespace  nspace=new CodeNamespace("Practice.MyNamespace")//创建命名空间
nspace.Imports.Add(new CodeNamespaceImport("System"));//引入程序命名空间：using System；
//nspace.Types 命名空间中所含类的集合，使用add添加

 

2、CodeTypeDeclaration类定义

CodeTypeDeclaration helloword = new CodeTypeDeclaration("HelloWord");//类型Class声明
helloword.Attributes = MemberAttributes.Public;//public 
//helloword.Members.AddRange(new CodeTypeMember[] { method, main });//添加方法到clss

 

 

3、CodeMemberMethod/CodeEntryPointMethod方法

CodeMemberMethod method = new CodeMemberMethod();//方法声明； 
method.Name = "SayHello";//  方法名
method.Attributes = MemberAttributes.Public | MemberAttributes.Final;//属性
method.ReturnType = new CodeTypeReference(typeof(string));//返回类型
method.Statements.Add(new CodeMethodReturnStatement(new CodePrimitiveExpression("Hello  from code!")));
//方法体，只有一句返回语句return "Hello  from code!";

CodeEntryPointMethod main = new CodeEntryPointMethod();//主方法Main
main.Statements.Add(new CodeVariableDeclarationStatement("HelloWord", "hw",
new CodeObjectCreateExpression("HelloWord", new CodeExpression[] { })));//变量声明：HelloWord hw = new HelloWord();

 

 

4、CodeMethodInvokeExpression表达式

CodeMethodInvokeExpression methodinvoke = 
new CodeMethodInvokeExpression(new CodeVariableReferenceExpression("hw"), "SayHello", new CodeExpression[] { });
main.Statements.Add(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression("System.Console"), "WriteLine", methodinvoke));
main.Statements.Add(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression("System.Console"), "Read"));
//两个方法调用：System.Console.WriteLine(hw.SayHello());

 

 

二、编译

System.CodeDom.Compiler常用类

CodeDomProvider创建编译器

CodeDomProvider provider = CodeDomProvider.CreateProvider("VisualBasic");
CodeDomProvider provider = CodeDomProvider.CreateProvider("C#");

CompilerParameters编译器参数

CompilerParameters cp = new CompilerParameters();

 

cp.ReferencedAssemblies.Add("system.dll");          //添加程序集 system.dll 的引用    
cp.GenerateExecutable = false;                          //不生成可执行文件    
cp.GenerateInMemory = true;                             //在内存中运行   

 

 CompilerResults编译结果

//得到编译器实例的返回结果    
CompilerResults cr = provider.CompileAssemblyFromSource(cp, code.ToString())

 

cr.Errors    //CompilerError集合、所有编译错误
cr.CompiledAssembly   //Assembly、 获取编译结果的程序集

　　

 

 示例一

using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Practice.CodeDom.Compiler
{
    class Program
    {
        static void Main(string[] args)
        {
            Program pro = new Program();
            CodeNamespace nspace = pro.CreateCodeDomHelloDemo();
            Console.WriteLine(pro.GengerCode(nspace));
            string filename = "HelloWorld.exe";
            CompilerResults result = pro.Execute(nspace, filename);
            if (result.Errors.HasErrors)//是否存在错误；
            {
                for (int i = 0; i < result.Output.Count; i++)

                    Console.WriteLine(result.Output[i]);

                for (int i = 0; i < result.Errors.Count; i++)

                    Console.WriteLine(i.ToString() + ": " + result.Errors[i].ToString());
            }
            else
            {
                System.Diagnostics.Process.Start(filename);//这里比较懒，不想动手去自己打开，呵呵；
            }
            Console.Read();
        }

        public CodeNamespace CreateCodeDomHelloDemo()
        {
            CodeMemberMethod method = new CodeMemberMethod();//方法声明； 
            method.Name = "SayHello";//  方法名
            method.Attributes = MemberAttributes.Public | MemberAttributes.Final;//属性
            method.ReturnType = new CodeTypeReference(typeof(string));//返回类型
            method.Statements.Add(new CodeMethodReturnStatement(new CodePrimitiveExpression("Hello  from code!")));//方法体，只有一句返回语句return "Hello  from code!";

            CodeEntryPointMethod main = new CodeEntryPointMethod();//主方法Main
            main.Statements.Add(new CodeVariableDeclarationStatement("HelloWord", "hw",
                new CodeObjectCreateExpression("HelloWord", new CodeExpression[] { })));//变量声明：HelloWord hw = new HelloWord();

            CodeMethodInvokeExpression methodinvoke = new CodeMethodInvokeExpression(new CodeVariableReferenceExpression("hw"), "SayHello", new CodeExpression[] { });
            main.Statements.Add(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression("System.Console"), "WriteLine", methodinvoke));
            main.Statements.Add(new CodeMethodInvokeExpression(new CodeTypeReferenceExpression("System.Console"), "Read"));//两个方法调用：System.Console.WriteLine(hw.SayHello());

            CodeTypeDeclaration helloword = new CodeTypeDeclaration("HelloWord");//类型Class声明
            helloword.Attributes = MemberAttributes.Public;
            helloword.Members.AddRange(new CodeTypeMember[] { method, main });//添加方法到clss

            CodeNamespace nspace = new CodeNamespace("HelloDemo1");//命名空间声明
            nspace.Imports.Add(new CodeNamespaceImport("System"));//引入程序命名空间：using System；
            nspace.Types.Add(helloword);//
            return nspace;
        }

        public string GengerCode(CodeNamespace nspace)
        {
            StringBuilder sb = new StringBuilder();
            System.IO.StringWriter sw = new System.IO.StringWriter(sb);
            CodeGeneratorOptions geneOptions = new CodeGeneratorOptions();//代码生成选项

            geneOptions.BlankLinesBetweenMembers = false;

            geneOptions.BracingStyle = "C";

            geneOptions.ElseOnClosing = true;

            geneOptions.IndentString = "    ";
            CodeDomProvider.GetCompilerInfo("c#").CreateProvider().GenerateCodeFromNamespace(nspace, sw, geneOptions);//代码生成
            sw.Close();
            return sb.ToString();

        }

        public CompilerResults Execute(CodeNamespace nspace, string filename)
        {
            CodeCompileUnit unit = new CodeCompileUnit();//code编译单元
            unit.Namespaces.Add(nspace);
            CodeDomProvider provider = CodeDomProvider.CreateProvider("C#");
            CompilerParameters options = new CompilerParameters();//

            options.GenerateInMemory = false;//是否在内存中生成；
            options.IncludeDebugInformation = true;// 包含调试信息；
            options.ReferencedAssemblies.Add("System.dll");
            options.OutputAssembly = filename;
            if (System.IO.Path.GetExtension(filename).ToLower() == ".exe")
            {
                options.GenerateExecutable = true;//true为可执行exe，false：dll
            }
            else
            {
                options.GenerateExecutable = false;//true为可执行exe，false：dll
            }
            return provider.CompileAssemblyFromDom(options, unit);//编译程序集
        }
    }
}

HelloWorld