C#中如何实现代码解释器

usingSystem;  usingSystem.Collections.Generic;  usingSystem.Reflection;  usingSystem.Globalization;  usingMicrosoft.CSharp;  usingSystem.CodeDom;  usingSystem.CodeDom.Compiler;  usingSystem.Text;  usingSystem.IO;  usingSystem.Xml;  namespaceTest  {  classProgram  {  staticvoidMain(string[]args)  {  Console.Write(">>");  Stringcmd;  Contextcxt=newContext();  while((cmd=Console.ReadLine().Trim())!="exit")  {  if(!String.IsNullOrEmpty(cmd))  {  Console.WriteLine();  cxt.Invoke(cmd);  }  Console.Write("\n>>");  }  }  }  publicclassContext  {  publicCSharpCodeProviderCodeProvider{get;set;}  publicIDictionary<String,Assembly>Assemblys{get;set;}  publicContext()  {  CodeProvider=newCSharpCodeProvider(newDictionary<string,string>(){{"CompilerVersion","v3.5"}});  Assemblys=newDictionary<String,Assembly>();  Assembly[]al=AppDomain.CurrentDomain.GetAssemblies();  foreach(Assemblyainal)  {  AddAssembly(a);  }  AppDomain.CurrentDomain.AssemblyLoad+=newAssemblyLoadEventHandler(CurrentDomain_AssemblyLoad);  }  privatevoidAddAssembly(Assemblya)  {  if(a!=null)  {  Assemblys.Add(a.FullName,a);  }  }  voidCurrentDomain_AssemblyLoad(objectsender,AssemblyLoadEventArgsargs)  {  Assemblya=args.LoadedAssembly;  if(!Assemblys.ContainsKey(a.FullName))  {  AddAssembly(a);  }  }  publicCompilerParametersCreateCompilerParameters()  {  CompilerParameterscp=newCompilerParameters();  cp.GenerateExecutable=false;  cp.GenerateInMemory=true;  if(Assemblys!=null)  {  foreach(AssemblyainAssemblys.Values)  {  cp.ReferencedAssemblies.Add(a.Location);  }  }  returncp;  }  publicvoidInvoke(Stringcmd)  {  StringinputCmdString=cmd.Trim();  if(String.IsNullOrEmpty(inputCmdString))return;  StringfullCmd=BuildFullCmd(inputCmdString);  CompilerResultscr=CodeProvider.CompileAssemblyFromSource(CreateCompilerParameters(),fullCmd);  if(cr.Errors.HasErrors)  {  BooleanrecompileSwitch=true;  foreach(CompilerErrorerrincr.Errors)  {  //CS0201:Onlyassignment,call,increment,decrement,andnewobjectexpressionscanbe  //usedasastatement  if(!err.ErrorNumber.Equals("CS0201"))  {  recompileSwitch=false;  break;  }  }  //重新编译  if(recompileSwitch)  {  StringdynaName="TempArg_Dynamic_"+DateTime.Now.Ticks.ToString();  inputCmdString=String.Format("var{0}=",dynaName)+inputCmdString;  inputCmdString+=";\nSystem.Console.WriteLine("+dynaName+");";  fullCmd=BuildFullCmd(inputCmdString);  cr=CodeProvider.CompileAssemblyFromSource(CreateCompilerParameters(),fullCmd);  }  if(cr.Errors.HasErrors)  {  Console.WriteLine("编译错误：");  foreach(CompilerErrorerrincr.Errors)  {  Console.WriteLine(err.ErrorNumber);  Console.WriteLine(err.ErrorText);  }  return;  }  }  Assemblyassem=cr.CompiledAssembly;  ObjectdynamicObject=assem.CreateInstance("Test.DynamicClass");  Typet=assem.GetType("Test.DynamicClass");  MethodInfominfo=t.GetMethod("MethodInstance");  minfo.Invoke(dynamicObject,null);  }  privateStringBuildFullCmd(StringinputCmdString)  {  StringStringfullCmd=String.Empty;  fullCmd+=@"  namespaceTest  {  publicclassDynamicClass  {  publicvoidMethodInstance()  {  "+inputCmdString+@";  }  }  }";  returnfullCmd;  }  }  }