使用CODEDOM

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前一阶段一直在做一个基于VS.NET2k3的一个插件，大致功能是实现业务代码的自动生成。程序在前几天终于突破性的进展，所有的功能都能实现了。包括自动添加工程，引用，编译等。等再过些天，把代码进行优化一些（同时去除一些BUG，一直不明白，当产生几万行代码后，我的开发环境会全面崩溃了）再发布出来吧。昨天突然想到，现在产生的代码过于生，不能根据用户的选择来生成对应的语言的代码。如果死写的话，也太没意思了。想到以前曾看过 MSDN里介绍过CODEDOM这玩意能生成各门语言的代码，能动态调用编译，于是快速将CODEDOM再看一次，果然能生成C#，VB，JSCRIPT 的代码。不过刚开始研究，只写了一个小小的程序。不过也觉得很有意思的。这样的话，我只要将我的TOOLKIT重写一下就可以让不同的程序员根据自己的喜好生成对应的代码了（功能都是一样的。）

using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using Microsoft.CSharp;
using Microsoft.VisualBasic;
using Microsoft.JScript;
//这个示例演示如何使用System.CodeDom来建立一个HELLO World程序,将会根据用户的选择动态代码生成及编译的C#,VB,JScript版本的程序集

namespace CodeDOMTest
{

public class CodeDomExampleForm : System.Windows.Forms.Form
{
private System.Windows.Forms.Button run_button = new System.Windows.Forms.Button();
private System.Windows.Forms.Button compile_button = new System.Windows.Forms.Button();
private System.Windows.Forms.Button generate_button = new System.Windows.Forms.Button();
private System.Windows.Forms.TextBox textBox1 = new System.Windows.Forms.TextBox();
private System.Windows.Forms.ComboBox comboBox1 = new System.Windows.Forms.ComboBox();
private System.Windows.Forms.Label label1 = new System.Windows.Forms.Label();

private void generate_button_Click(object sender, System.EventArgs e)
{
CodeDomProvider provider = GetCurrentProvider();
CodeDomExample.GenerateCode(provider, CodeDomExample.BuildHelloWorldGraph());

StreamReader sr = new StreamReader("MyHello.cs");
textBox1.Text = sr.ReadToEnd();
sr.Close();
}

private void compile_button_Click(object sender, System.EventArgs e)
{
CodeDomProvider provider = GetCurrentProvider();
CompilerResults cr = CodeDomExample.CompileCode(provider, "MyHello.cs");

if(cr.Errors.Count > 0)
{
textBox1.Text = "编译文件出错： "+cr.PathToAssembly+": \r\n";
foreach(CompilerError ce in cr.Errors)
textBox1.AppendText(ce.ToString()+"\r\n");
run_button.Enabled = false;
}
else
{
textBox1.Text = cr.PathToAssembly+" 编译成功";
run_button.Enabled = true;
}
}

private void run_button_Click(object sender, System.EventArgs e)
{
Process.Start("MyHello.exe");
}

/// <summary>
/// 根据用户的选择返回不同语言的代码生成器
/// </summary>
/// <returns></returns>
private CodeDomProvider GetCurrentProvider()
{
CodeDomProvider provider;
switch((string)this.comboBox1.SelectedItem)
{
case "CSharp":
provider = new CSharpCodeProvider();
break;
case "Visual Basic":
provider = new VBCodeProvider();
break;
case "JScript":
provider = new JScriptCodeProvider();
break;
default:
provider = new CSharpCodeProvider();
break;
}
return provider;
}

public CodeDomExampleForm()
{
this.SuspendLayout();
this.label1.Location = new System.Drawing.Point(395, 20);
this.label1.Size = new Size(180, 22);
this.label1.Text = "Select a programming language:";
this.comboBox1.Location = new System.Drawing.Point(560, 16);
this.comboBox1.Size = new Size(190, 23);
this.comboBox1.Name = "comboBox1";
this.comboBox1.Items.AddRange( new string[] { "CSharp", "Visual Basic", "JScript" } );
this.comboBox1.Anchor = System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right | System.Windows.Forms.AnchorStyles.Top;
this.comboBox1.SelectedIndex = 0;
this.generate_button.Location = new System.Drawing.Point(8, 16);
this.generate_button.Name = "generate_button";
this.generate_button.Size = new System.Drawing.Size(120, 23);
this.generate_button.Text = "Generate Code";
this.generate_button.Click += new System.EventHandler(this.generate_button_Click);

this.compile_button.Location = new System.Drawing.Point(136, 16);
this.compile_button.Name = "compile_button";
this.compile_button.Size = new System.Drawing.Size(120, 23);
this.compile_button.Text = "Compile";
this.compile_button.Click += new System.EventHandler(this.compile_button_Click);

this.run_button.Enabled = false;
this.run_button.Location = new System.Drawing.Point(264, 16);
this.run_button.Name = "run_button";
this.run_button.Size = new System.Drawing.Size(120, 23);
this.run_button.Text = "Run";
this.run_button.Click += new System.EventHandler(this.run_button_Click);

this.textBox1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right);
this.textBox1.Location = new System.Drawing.Point(8, 48);
this.textBox1.Multiline = true;
this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(744, 280);
this.textBox1.Text = "";
// CodeDomExampleForm
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(768, 340);
this.MinimumSize = new System.Drawing.Size(750, 340);
this.Controls.AddRange(new System.Windows.Forms.Control[] { this.textBox1, this.run_button, this.compile_button, this.generate_button, this.comboBox1, this.label1 });
this.Name = "CodeDomExampleForm";
this.Text = "CodeDom Hello World Example";
this.ResumeLayout(false);
}

protected override void Dispose( bool disposing )
{
base.Dispose( disposing );
}

private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(448, 269);
this.Name = "CodeDomExampleForm";

}

[STAThread]
static void Main()
{
Application.Run(new CodeDomExampleForm());
}
}

public class CodeDomExample
{

public static CodeCompileUnit BuildHelloWorldGraph()
{
//建立一个代码容器
//CodeCompileUnit 包含以下几个集合：可以存储包含 CodeDOM 源代码图形的 CodeNamespace 对象的集合、
//项目引用的程序集的集合，以及项目程序集的属性集合。
CodeCompileUnit CompileUnit = new CodeCompileUnit();

// 声明一个名称空间
CodeNamespace MySample = new CodeNamespace("MySample");
// 将名称空间加入到代码容器
CompileUnit.Namespaces.Add( MySample );

// 导入一个名称空间
MySample.Imports.Add( new CodeNamespaceImport("System") );

// 声明一个类型
CodeTypeDeclaration Hello = new CodeTypeDeclaration("Hello");
// 将类型加入到容器的类型集合中
MySample.Types.Add(Hello);

// 构造函数(并非必须)
CodeConstructor con = new CodeConstructor();
con.Attributes = MemberAttributes.Public | MemberAttributes.Final;
Hello.Members.Add(con);
// 表示可执行文件的入口点方法,也就是一个程序的入口
CodeEntryPointMethod Start = new CodeEntryPointMethod();
// 建立一个代码调用的表达式
CodeMethodInvokeExpression cs1 = new CodeMethodInvokeExpression(
// 调用方法. System.Console.WriteLine
new CodeTypeReferenceExpression("System.Console"), "WriteLine",
// 给方法传一个基元数据类型的值
new CodePrimitiveExpression("Hello World!") );
// 将方法加入到方法中
Start.Statements.Add(new CodeExpressionStatement(cs1));
CodeMethodInvokeExpression cs2 = new CodeMethodInvokeExpression();
CodeMethodReferenceExpression cmr=new CodeMethodReferenceExpression();
cmr.MethodName="SayHell";
cs2.Method=cmr;

Start.Statements.Add(new CodeExpressionStatement(cs2));

// 将方法加入到类型中
Hello.Members.Add( Start );

// 成员函数SayHello,有参数,无返回值

// public bool SayHello(string input)
// {
// Console.WriteLine(input);
// return false;
// }
CodeMemberMethod cm = new CodeMemberMethod();
cm.Name = "SayHello";

cm.ReturnType=new CodeTypeReference(typeof(bool));
cm.Attributes = MemberAttributes.Public | MemberAttributes.Final|MemberAttributes.Static;
cm.Parameters.Add(
new CodeParameterDeclarationExpression(
typeof(string),"input"));
cm.Statements.Add(
new CodeMethodInvokeExpression(
new CodeSnippetExpression("Console"),"WriteLine",
new CodeArgumentReferenceExpression("input")));
cm.Statements.Add(new CodeMethodReturnStatement( new CodePrimitiveExpression(false)));
Hello.Members.Add(cm);

return CompileUnit;
}

public static void GenerateCode(CodeDomProvider provider, CodeCompileUnit compileunit)
{
//获得生成代码的接口
ICodeGenerator gen = provider.CreateGenerator();
// 输出到文件
IndentedTextWriter tw = new IndentedTextWriter(new StreamWriter("MyHello.cs", false), " ");
// 使用代码生成接口产生源代码.
gen.GenerateCodeFromCompileUnit(compileunit, tw, new CodeGeneratorOptions());

tw.Close();
}

public static CompilerResults CompileCode(CodeDomProvider provider, string filepath)
{
// 获得编译器.
ICodeCompiler compiler = provider.CreateCompiler();
//配置编译参数。将SYSTEM。DLL引用进来，同时明确生成的代码为EXE

CompilerParameters cp = new CompilerParameters(new string[] {"System.dll"}, filepath.Substring(0, filepath.LastIndexOf(".")+1)+"exe", false);

cp.GenerateExecutable = true;
// 调用编译器
CompilerResults cr = compiler.CompileAssemblyFromFile(cp, filepath);

return cr;
}
}

}

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