CodeCompileUnit.cs

using System.Collections.Specialized;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;

namespace System.CodeDom
{
    [Serializable]
    [ClassInterface(ClassInterfaceType.AutoDispatch)]
    [ComVisible(true)]
    public class CodeCompileUnit : CodeObject
    {
        private CodeNamespaceCollection namespaces = new CodeNamespaceCollection();

        private StringCollection assemblies;

        private CodeAttributeDeclarationCollection attributes;

        [OptionalField]
        private CodeDirectiveCollection startDirectives;

        [OptionalField]
        private CodeDirectiveCollection endDirectives;

        public CodeNamespaceCollection Namespaces => namespaces;

        public StringCollection ReferencedAssemblies
        {
            get
            {
                if (assemblies == null)
                {
                    assemblies = new StringCollection();
                }
                return assemblies;
            }
        }

        public CodeAttributeDeclarationCollection AssemblyCustomAttributes
        {
            get
            {
                if (attributes == null)
                {
                    attributes = new CodeAttributeDeclarationCollection();
                }
                return attributes;
            }
        }

        public CodeDirectiveCollection StartDirectives
        {
            get
            {
                if (startDirectives == null)
                {
                    startDirectives = new CodeDirectiveCollection();
                }
                return startDirectives;
            }
        }

        public CodeDirectiveCollection EndDirectives
        {
            get
            {
                if (endDirectives == null)
                {
                    endDirectives = new CodeDirectiveCollection();
                }
                return endDirectives;
            }
        }
    }
}