服务器控件数据回发实现IPostBackDataHandler需注意的

我写的服务器控件（未完，模型如此）

using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.ComponentModel;

using System.Linq;

using System.Resources;

using System.Text;

using System.Threading.Tasks;

using System.Web;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;



namespace DecColorPicker

{

    [DefaultProperty("DecColorPickerControl")]

    [ToolboxData("<{0}:DecColorPickerControl runat=server></{0}:DecColorPickerControl>")]

    public class DecColorPickerControl : WebControl, IPostBackDataHandler

    {



        public string ColorValue

        {

            get

            {

                string viewstr = this.ID + "_ColorValue";

                object text = ViewState[viewstr];

                if (text == null)

                    return string.Empty;

                else

                    return (string)text;

            }

            set

            {

                string viewstr = this.ID + "_ColorValue";

                ViewState[viewstr] = value;

            }

        }



        public string DivContranerID

        {

            get

            {

                string viewstr = this.ID + "_DivContranerID";

                String s = (String)ViewState[viewstr];

                return ((s == null) ? this.ID + "DecTextBox" : s);

            }



            set

            {

                string viewstr = this.ID + "_DivContranerID";

                ViewState[viewstr] = value;

            }

        }



        public string PickerBtnID

        {

            get

            {

                string viewstr = this.ID + "_PickerBtnID";

                String s = (String)ViewState[viewstr];

                return ((s == null) ? this.ID + "_PickerBtn" : s);

            }



            set

            {

                string viewstr = this.ID + "_PickerBtnID";

                ViewState[viewstr] = value;

            }

        }



        [Description("设置按钮的文本")]

        public string PickerBtnText

        {

            get

            {

                string viewstr = this.ID + "_PickerBtnText";

                String s = (String)ViewState[viewstr];

                return ((s == null) ? "选择颜色" : s);

            }



            set

            {

                string viewstr = this.ID + "_PickerBtnText";

                ViewState[viewstr] = value;

            }

        }



        [Description("是否显示按钮")]

        public bool ShowPickerBtn

        {

            get

            {

                string viewstr = this.ID + "_ShowPickerBtn";

                var s = ViewState[viewstr];

                return s == null ? true : (Convert.ToBoolean(s));

            }



            set

            {

                string viewstr = this.ID + "_ShowPickerBtn";

                ViewState[viewstr] = value;

            }

        }



        #region 选择器配置



        [Bindable(false), DefaultValue(""), Browsable(true), Description("颜色选择器的宽度"), Category("选择器设置")]

        public string PickerWidth

        {

            get

            {

                string viewstr = this.ID + "_PickerWidth";

                String s = (String)ViewState[viewstr];

                return ((s == null) ? "" : s);

            }

            set

            {

                string viewstr = this.ID + "_PickerWidth";

                ViewState[viewstr] = value;

            }

        }

        [Bindable(false), DefaultValue(""), Browsable(true), Description("颜色选择器的高度"), Category("选择器设置")]

        public string PickerHeight

        {

            get

            {

                string viewstr = this.ID + "_PickerHeight";

                String s = (String)ViewState[viewstr];

                return ((s == null) ? "" : s);

            }

            set

            {

                string viewstr = this.ID + "_PickerHeight";

                ViewState[viewstr] = value;

            }

        }



        #endregion



        public string Text

        {

            get

            {

                object text = ViewState["Text"];

                if (text == null)

                    return string.Empty;

                else

                    return (string)text;

            }

            set

            {

                ViewState["Text"] = value;

            }

        }

        public event EventHandler TextChanged;



        protected void OnTextChanged(EventArgs e)

        {

            if (TextChanged != null)

                TextChanged(this, e);

        }



        public bool LoadPostData(string postDataKey, NameValueCollection postCollection)

        {

            string postedData = postCollection[postDataKey];//回发回来的字符串



            if (!this.ColorValue.Equals(postedData))

            {

                this.ColorValue = postedData;

                return true;

            }

            else

            {

                return false;

            }

        }



        public void RaisePostDataChangedEvent()

        {

            OnTextChanged(EventArgs.Empty);

        }

        protected override void Render(HtmlTextWriter writer)

        {

            StringBuilder sb = new StringBuilder();

            sb.AppendFormat("<div id=\"{0}\">", this.DivContranerID);

            sb.AppendFormat("<script>{0}</script>", DecColorPicker.Properties.Resources.colorPicker);

            //注意此处必须为UniqueID 原因是与LoadPostData的postDataKey 一一对应 lcc

            sb.AppendFormat("<input type='text' onclick='colorPicker(event)' id='{0}' name='{0}' />", this.UniqueID);

            if (this.ShowPickerBtn)

            {

                sb.AppendFormat("<input type=\"button\" value=\"{0}\" onclick=\"document.getElementById('{1}').click();\">", this.PickerBtnText, this.UniqueID);



            }

            sb.Append("</div>");

            writer.Write(sb.ToString());



        }

    }

}

注意：
sb.AppendFormat("<input type='text' onclick='colorPicker(event)' id='{0}' name='{0}' />", this.UniqueID);

这个textbox的ID必须为UniqueID，如果填写别的ID将无法进行PostData的回发绑定。

此问题我纠结了很久。才发现的。。。。