Imports System.CodeDom

Module SO12963383Main
Sub Main
    Dim compileUnit As New CodeCompileUnit

    Dim ns As New CodeNamespace()
    compileUnit.Namespaces.Add(ns)
    ns.Imports.Add(New CodeNamespaceImport("System"))
    ns.Imports.Add(New CodeNamespaceImport("System.Collections.Generic"))

    Dim fooClass As New CodeTypeDeclaration("Foo")
    ns.Types.Add(fooClass)
    fooClass.TypeAttributes = Reflection.TypeAttributes.Public
    fooClass.IsClass = True

    Dim fooCollection As New CodeTypeDeclaration("FooCollection")
    ns.Types.Add(fooCollection)
    fooCollection.TypeAttributes = Reflection.TypeAttributes.Public
    fooCollection.IsClass = True
    fooCollection.BaseTypes.Add(New CodeTypeReference(GetType(System.Object)))
    fooCollection.BaseTypes.Add(New CodeTypeReference( _
        "System.Collections.Generic.IEnumerable" _
        , New CodeTypeReference() {New CodeTypeReference("Foo")} _
    ))

    Dim method As New CodeMemberMethod
    fooCollection.Members.Add(method)
    method.Attributes = MemberAttributes.Private
    method.Name = "GetEnumerator"
    method.ReturnType = New CodeTypeReference( _
        "System.Collections.Generic.IEnumerator" _
        , New CodeTypeReference() {New CodeTypeReference("Foo")} _
    )
    method.ImplementationTypes.Add(New CodeTypeReference( _
        "System.Collections.Generic.IEnumerable" _
        , New CodeTypeReference() {New CodeTypeReference("Foo")} _
    ))

    method = New CodeMemberMethod
    fooCollection.Members.Add(method)
    method.Attributes = MemberAttributes.Private
    method.Name = "GetEnumerator"
    method.ReturnType = New CodeTypeReference( _
        "System.Collections.IEnumerator" _
    )
    method.PrivateImplementationType = New CodeTypeReference( _
        "System.Collections.IEnumerable" _
    )

    Dim provider As New Microsoft.VisualBasic.VBCodeProvider
    Dim options As New Compiler.CodeGeneratorOptions
    Dim writer As New IO.StringWriter
    provider.GenerateCodeFromCompileUnit(compileUnit, writer, options)
    Console.WriteLine(writer.ToString())
End Sub
End Module