原文 http://blog.sunmast.com/sunmast/archive/2004/08/24/870.aspx
using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.IO;
using System.Reflection;
using System.Text;
using Microsoft.CSharp;
namespace Sunmast.Sample.CodeDom
{
class Entry
{
[STAThread]
static void Main(string[] args)
{
// 建立CodeDOM
CodeCompileUnit codeDom = GenerateCodeDom();
// 編譯為可用的Assembly
// 這裡使用C#代碼,實際上任何繼承了CodeDomProvider類的Provider都行
// 是以可以換成Microsoft.VisualBasic.VBCodeProvider
Assembly assembly = ComplieCodeDomToAssembly(codeDom,new CSharpCodeProvider());
// 動态調用assembly
if(assembly != null)
{
InvokeMethodsFromAssembly(assembly);
}
Console.ReadLine();
}
static CodeCompileUnit GenerateCodeDom()
{
// 命名空間
CodeNamespace cn = new CodeNamespace("Sunmast.Sample.CodeDom");
cn.Imports.Add(new CodeNamespaceImport("System"));
// 建立新的類型
CodeTypeDeclaration ctd = new CodeTypeDeclaration("SunmastClass");
ctd.IsClass = true;
ctd.TypeAttributes = TypeAttributes.Public;
// 構造函數(并非必須)
CodeConstructor cc = new CodeConstructor();
cc.Attributes = MemberAttributes.Public | MemberAttributes.Final;
ctd.Members.Add(cc);
// 成員函數MyMethod
CodeMemberMethod cmm = new CodeMemberMethod();
cmm.Name = "MyMethod";
cmm.Attributes = MemberAttributes.Public | MemberAttributes.Final;
cmm.Parameters.Add(
new CodeParameterDeclarationExpression(
typeof(string),"input"));
cmm.Statements.Add(
new CodeMethodInvokeExpression(
new CodeSnippetExpression("Console"),"WriteLine",
new CodeArgumentReferenceExpression("input")));
ctd.Members.Add(cmm);
cn.Types.Add(ctd);
// 建立編譯單元
CodeCompileUnit unit = new CodeCompileUnit();
unit.Namespaces.Add(cn);
return unit;
}
static Assembly ComplieCodeDomToAssembly(CodeCompileUnit compilationUnit,CodeDomProvider languageProvider)
{
// 預覽代碼
Console.WriteLine("// 預覽代碼");
StringBuilder sb = new StringBuilder();
ICodeGenerator icg = languageProvider.CreateGenerator();
icg.GenerateCodeFromCompileUnit(compilationUnit,new StringWriter(sb),null);
Console.WriteLine(sb.ToString());
ICodeCompiler complier = languageProvider.CreateCompiler();
// 建立編譯參數
CompilerParameters options = new CompilerParameters(new string[]{"MsCorLib.dll","System.dll"});
// 在記憶體中建立Assembly
options.GenerateInMemory = true;
// 關閉調式資訊,提高性能
options.IncludeDebugInformation = true;
// 忽略警告
options.TreatWarningsAsErrors = false;
// 編譯并得到編譯結果
CompilerResults results = complier.CompileAssemblyFromDom(options,compilationUnit);
foreach(string str in results.Output)
{
Console.WriteLine(str);
}
if(results.NativeCompilerReturnValue != 0)
{
// 編譯失敗
Console.WriteLine("!ERROR:");
foreach(CompilerError error in results.Errors)
{
Console.WriteLine(error.ErrorText);
}
return null;
}
else
{
return results.CompiledAssembly;
}
}
static void InvokeMethodsFromAssembly(Assembly assembly)
{
// 得到置于Assembly的class
// 需要寫完整命名空間
Type t = assembly.GetType("Sunmast.Sample.CodeDom.SunmastClass",true,true);
// 調用構造函數建立對象
Object obj = t.InvokeMember(null, BindingFlags.CreateInstance, null, null, null);
// Object obj = Activator.CreateInstance(t); // 也可以這麼寫
// 調用對象的方法(MyMethod)
Console.WriteLine("Invoke Method /"MyMethod/": The END.");
t.InvokeMember("MyMethod",BindingFlags.InvokeMethod, null, obj, new object[]{"The END."});
}
}
}