using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.CodeDom;
using System.CodeDom.Compiler;

namespace BugInCodeComGenerateEvent
{
    class Program
    {
        static void Main(string[] args)
        {
            string strGeneratedCode = null;
            System.CodeDom.CodeCompileUnit ccu = new System.CodeDom.CodeCompileUnit();
            System.CodeDom.Compiler.CodeDomProvider provider = System.CodeDom.Compiler.CodeDomProvider.CreateProvider("CSharp");

            CodeNamespace ns = new CodeNamespace("Bug");
            ccu.Namespaces.Add(ns);

            //Create a new Class  A
            CodeTypeDeclaration ctdA = new CodeTypeDeclaration("A");
            ns.Types.Add(ctdA);
            
            //Create a new Event TestEvent in A
            CodeMemberEvent cmeATestEvent = new CodeMemberEvent();
            cmeATestEvent.Name = "TestEvent";
            cmeATestEvent.Type = new CodeTypeReference(typeof(EventHandler));
            cmeATestEvent.Attributes = MemberAttributes.Public | MemberAttributes.Final;
            ctdA.Members.Add(cmeATestEvent);

            //Create a new Class B (Inherits from A)
            CodeTypeDeclaration ctdB = new CodeTypeDeclaration("B");
            ctdB.Attributes = MemberAttributes.Public | MemberAttributes.Final;
            ctdB.BaseTypes.Add("A");
            ns.Types.Add(ctdB);

            //Create a new Event TestEvent in B
            CodeMemberEvent cmeBTestEvent = new CodeMemberEvent();
            cmeBTestEvent.Name = "TestEvent";
            cmeBTestEvent.Type = new CodeTypeReference(typeof(System.ComponentModel.CancelEventHandler));
            cmeBTestEvent.Attributes = MemberAttributes.Public | MemberAttributes.Final | MemberAttributes.New;
            cmeBTestEvent.Comments.Add(new CodeCommentStatement("public event EventHandler TestEvent; is wrong (new-Attribute is missing)"));
            cmeBTestEvent.Comments.Add(new CodeCommentStatement("public new event EventHandler TestEvent; would be correct"));
            ctdB.Members.Add(cmeBTestEvent);

            /*
             * Have a look at: Class: Microsoft.CSharp.CSharpCodeGenerator
             * 
             * Compare Methods: GenerateMethod with GenerateEvent
             * 
             * GenerateMethod calls:
             * 
             * 			this.OutputMemberAccessModifier(e.Attributes);    (public / internal protected ....)
			            this.OutputVTableModifier(e.Attributes);          (new )
			            this.OutputMemberScopeModifier(e.Attributes);     (abstract / virtual ....)
             * 
             * GenerateEvent only calls:
             * 
             * this.OutputMemberAccessModifier(e.Attributes);    (public / internal protected ....)
             * 
             * --- Calls to OutputVTableModifier and OutputMemberScopeModifier are missing
             */

            using (MemoryStream ms = new MemoryStream())
            {
                IndentedTextWriter tw = new IndentedTextWriter(new StreamWriter(ms));
                // Generate source code using the code generator.
                provider.GenerateCodeFromCompileUnit(ccu, tw, new CodeGeneratorOptions());
                // Close the output file.
                tw.Close();
                strGeneratedCode = System.Text.Encoding.UTF8.GetString(ms.GetBuffer());
            }
            System.Diagnostics.Debug.WriteLine(strGeneratedCode);
            Console.WriteLine(strGeneratedCode);
        }
    }
}