Пользовательский скрипт на C#

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using System;
using System.Reflection;
using Microsoft.CSharp;
using System.CodeDom.Compiler;

class Script //singleton
{
    private static Script instance;

    private Script() { }

    string code = @"
    using System;
            
    namespace UserFunctions
    {                
        public class FunctionClass
        {                
            public static int Function(int arg)
            {
                return script_func;
            }
        }
    }
";

    CSharpCodeProvider provider = new CSharpCodeProvider();

    public static Script Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new Script();
            }
            return instance;
        }
    }

    public Func<int, int> createDelegate(string script)
    {
        try
        {
            string finalCode = code.Replace("script_func", script);
            CompilerResults results = provider.CompileAssemblyFromSource(new CompilerParameters(), finalCode);
            System.Type assembly = results.CompiledAssembly.GetType("UserFunctions.FunctionClass");
            MethodInfo func = assembly.GetMethod("Function");
            return (Func<int, int>)Delegate.CreateDelegate(typeof(Func<int, int>), func);
        }
        catch
        {
            throw new Exception(string.Format("ошибка в скрипте: {0}", script));
        }
    }
}