C# 将自定义属性保留在单独的程序集中

我有自定义属性和使用这些属性的类。选择类对象时，这些属性用于属性网格。当前，类和属性位于同一程序集中。在属性中，我有一些表单对象。由于这些 Form 对象，我希望将属性保存在单独的程序集中。但是，它会导致循环引用。 你能在这个问题上帮助我吗？

样本：

我有业务对象，其属性可以显示在属性网格控制中：

    public class Field
    {
        public Field()
        {
        }
        private int _Type;
        [CustomPropertyEditorMarker(typeof(RepositoryItemForFieldDataType))]
        public int Type
        {
            get { return _Type; }
            set
            {
                _Type = value;
            }
        }
    }
    [AttributeUsage(AttributeTargets.Property)]
    public sealed class CustomPropertyEditorMarker : Attribute
    {
        public CustomPropertyEditorMarker(Type editorType)
        {
            EditorType = editorType;
        }
        public readonly Type EditorType;
    }
    public sealed class RepositoryItemForFieldDataType : RepositoryItemLookUpEdit
    {
        public RepositoryItemForFieldDataType()
        {
                // Populating LookupEdit details here
        }
        private void On_ButtonClick()
        {
            // Here initializing existing Form class and show it
        }
    }
When Field object is selected, PropertGridControl analyze selected object and checking which property has above Attribute. If yes, then initialize it.
        private void SelectObject(object obj)
        {
            this.Rows.Clear();
            this.DefaultEditors.Clear();
            this.RepositoryItems.Clear();
            if ((this.LastSelectedObject as ApplicationDomainItemBase) != null)
            {
                (this.LastSelectedObject as ApplicationDomainItemBase).IsSelected = false;
            };
            this.SelectedObject = null;
            this.SelectedObject = obj;
            if (!(this.SelectedObject is ConfigurationObjectManagerBase))
            {
                foreach (var propInfo in this.SelectedObject.GetType().GetProperties())
                {
                    object[] objFieldAtts = propInfo.GetCustomAttributes(typeof(CustomPropertyEditorMarker), true);
                    if (objFieldAtts != null && objFieldAtts.Length > 0)
                    {
                        if (this.GetRowByFieldName(propInfo.Name) != null)
                        {
                            RepositoryItem repItem = Activator.CreateInstance(((CustomPropertyEditorMarker)objFieldAtts[0]).EditorType) as RepositoryItem;
                            this.GetRowByFieldName(propInfo.Name).Properties.RowEdit = repItem;
                        };
                    };
                };
            };
            this.LastSelectedObject = obj;
        }

目前，业务对象类和属性都位于同一程序集中，需要将它们分开。但是我不能，因为业务对象属性是用属性名称装饰的，需要添加引用。无法添加引用，因为属性类具有对业务对象类的引用。希望清楚。谢谢。