PropertyGrid控件下拉列表

 把别人的例子稍做了一下修改，部分内容没看懂，但程序可以运行，如果有什么错误或不当之处，请指教！

        /// <summary>
        /// 一.自定义一个特性类ListAttribute,提供下拉列表值:
        /// </summary>
         public class ListAttribute : Attribute
        {
            public string[] _lst;

            public ListAttribute(string[] lst)
            {
                //初始化列表值  
                 _lst =lst;
            }
        }

        /// <summary>
        /// 二.特性转换器MyConverter 
        /// </summary>
         public class MyConverter : ExpandableObjectConverter
        {
            public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
            {
                return true;
            }

            public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
            {
                return true;
            }

            public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
            {
                ListAttribute listAttribute = (ListAttribute)context.PropertyDescriptor.Attributes[typeof(ListAttribute)];
                StandardValuesCollection vals = new TypeConverter.StandardValuesCollection(listAttribute._lst);

                return vals;
            }

            public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
            {
                return true;
            }
        }

        /// <summary>
        /// 三.应用示例：
        /// </summary>
        public class MyObject
        {
            private string _name;

            [CategoryAttribute("信息"), DescriptionAttribute("姓名"),
            TypeConverter(typeof(MyConverter)), ListAttribute( new string[] { "张三", "李四", "王五", "赵六", "马七" })]
            public string Name
            {
                get { return _name; }
                set { _name = value; }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.propertyGrid1.SelectedObject = new MyObject();
        }

显示效果如下: