动态生成装配中的扩展方法？

 public static void CodeDomDooDad()
    {
        using (var provider = new CSharpCodeProvider())
        {
            var compilerParameters = new CompilerParameters();

            compilerParameters.ReferencedAssemblies.Add("system.dll");
            compilerParameters.CompilerOptions = "/t:library";
            compilerParameters.GenerateInMemory = true;

            var sb = new StringBuilder();

            sb.Append("namespace MooCow n{ n");
            sb.Append("public static class Extensions {n");
            sb.Append("public static string ToMoo(this string s) {n");
            sb.Append("return s.Replace(" ","moo");n");
            sb.Append("}n");
            sb.Append("}n");
            sb.Append("}n");

            //Console.WriteLine(sb.ToString());

            var cr = provider.CompileAssemblyFromSource(compilerParameters, sb.ToString());
            if (cr.Errors.Count > 0)
            {
                CompilerError error = cr.Errors[0];
                Console.WriteLine(
                    "error:"+error.ErrorText + 
                    " line:" +error.Line + 
                    " col:" +error.Column + 
                    " isWarning:" + error.IsWarning);
            }
        }
    }

namespace MooCow {
public static class Extensions
{
    public static string ToMoo(this string s)
    {
        return s.Replace(" ", "moo");
    }
}