类似Font属性的实现

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Globalization;

namespace WebApplication40
{
    [TypeConverter(typeof(ExpandableObjectConverter))]
    public class Style
    {
        //private Color _BackColor;

        //[NotifyParentProperty(true)]
        //public Color BackColor
        //{
        //   get { return _BackColor; }
        //   set { _BackColor = value; }
        //}

        private string _X;
        private string _Y;

        [NotifyParentProperty(true), DefaultValue("")]
        public string X
        {
            get { return _X; }
            set { _X = value; }
        }

        [NotifyParentProperty(true), DefaultValue("")]
        public string Y
        {
            get { return _Y; }
            set { _Y = value; }
        }

        public Style()
            : this(String.Empty, String.Empty)
        {
        }

        public Style(string X, string Y)
        {
            this._X = X;
            this._Y = Y;
        }

        public override string ToString()
        {

            return "";

        }

        public virtual string ToString(CultureInfo culture)
        {
            return TypeDescriptor.GetConverter(typeof(Style)).ConvertToString(null, culture, this);
        }
    }

}

[PersistenceMode(PersistenceMode.Attribute)]
就是这里 PersistenceMode要选择Attribute

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
这里DesignerSerializationVisibility 要选择Content 就能实现我的效果了

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication40
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:myTextBox runat=server></{0}:myTextBox>")]
    public class myTextBox : TextBox
    {

        private Style _Style;

        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public override string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return ((s == null) ? String.Empty : s);
            }

            set
            {
                ViewState["Text"] = value;
            }
        }

        [PersistenceMode(PersistenceMode.Attribute)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        [NotifyParentProperty(true)]
        [Category("复杂属性")]
        [Description("复杂属性——内部嵌套形式")]
        public Style BackColorStyle
        {
            get
            {
                if (_Style == null)
                {
                    _Style = new Style();
                }
                return _Style;
            }
        }


        protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write(Text);
        }

    }
}

 From:锋火燎皇