Excel-DNA Dynamic Code from string

gistfile1.txt

<DnaLibrary Name="ExcelDna Test Dynamic Method" Language="C#">
<Reference Name="System.Windows.Forms" />
	<![CDATA[
	using System;
    using System.CodeDom.Compiler;
	using System.Collections.Generic;
    using System.IO;
    using System.Reflection;
    using System.Windows.Forms;
    using Microsoft.CSharp;
	using ExcelDna.Integration;

	public class Test : IExcelAddIn
	{
        // Just to test that we are loaded.
		public static double MyAdd(double d1, double d2)
		{
			return d1 + d2;
		}

		public void AutoOpen()
		{
            RegisterMyClass();
        }

		public void AutoClose()
		{
		}
        
        private void RegisterMyClass()
        {
            string code = 
                @"
                public class Script 
                { 
                    public static double MyDynamicAdd(double d1, double d2)
                    {
                        return d1 + d2;
                    }
                }";

        CompilerParameters cp = new CompilerParameters();
        cp.GenerateExecutable = false;
        cp.GenerateInMemory = true;
        cp.TreatWarningsAsErrors = false;
        cp.ReferencedAssemblies.Add("System.dll"); //, "System.Windows.Forms.dll", "ExcelDna.Integration.dll" );
        CSharpCodeProvider provider = new CSharpCodeProvider();
        CompilerResults cr = provider.CompileAssemblyFromSource(cp, new string[] { code });
        if (!cr.Errors.HasErrors)
        {
            Assembly asm = cr.CompiledAssembly;
            Type[] types = asm.GetTypes();
            List<MethodInfo> methods = new List<MethodInfo>();

            // Get list of MethodInfo's from assembly for each method with ExcelFunction attribute
            foreach (Type type in types)
            {
                foreach (MethodInfo info in type.GetMethods(BindingFlags.Public | BindingFlags.Static))
                {
//                    foreach (Attribute attr in info.GetCustomAttributes(false))
//                    {
//                        Type attribType = attr.GetType();
//                        if (attribType.FullName == "ExcelDna.Integration.ExcelFunctionAttribute" ||
//                            attribType.FullName == "ExcelDna.Integration.ExcelCommmandAttribute" )
//                        {
                            methods.Add(info);
//                        }
//                    }
                }
            }
            Integration.RegisterMethods(methods);
        }
        else
        {
            MessageBox.Show("Errors during compile!");
        }
    }
    }
]]>
</DnaLibrary>