如何 动态编译自己写的代码

CSharpCodeProvider _coder=new CSharpCodeProvider();
ICodeCompiler complier=_coder.CreateCompiler();
CompilerParameters _par=new CompilerParameters();
_par.GenerateExecutable=true;
_par.OutputAssembly="sy1.exe";//设置应用程序名
_par.MainClass="sy1";//设置主类

_par.IncludeDebugInformation=true;
foreach(Assembly asm in AppDomain.CurrentDomain.GetAssemblies())
{
_par.ReferencedAssemblies.Add(asm.Location);
}
string get_Code=_code;
CompilerResults _res=complier.CompileAssemblyFromSource(_par,get_Code);
if(_res.Errors.Count>0)
{
ErrInfo pEi=new ErrInfo();
pEi.Show();
ListBox getList=pEi.getList;
foreach(CompilerError err in _res.Errors)
{
getList.Items.Add(err.ErrorText);
}
}
else
{
MessageBox.Show("success");
}