複合控件的成功典范！！！(修正)

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Drawing;

namespace CreateTech.Retail.ServerControl
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:BaseDataSelecter runat=\"server\"></{0}:BaseDataSelecter>")]
    public class BaseDataSelecter : WebControl
    {
        private System.Web.UI.WebControls.HiddenField _hiddenField=new HiddenField();
        private System.Web.UI.WebControls.TextBox _textBoxCode=new TextBox();
        private System.Web.UI.WebControls.TextBox _textBoxName=new TextBox();

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //复合控件中隱藏文本框的ClientID
        public string HiddenFieldClientID
        {
            get
            {
                EnsureChildControls();
                return _hiddenField.ClientID;
            }
        }

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //复合控件中CODE文本框的ClientID
        public string TextBoxCodeClientID
        {
            get
            {
                EnsureChildControls();
                return _textBoxCode.ClientID;
            }
        }

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //复合控件中Name文本框的ClientID
        public string TextBoxNameClientID
        {
            get
            {
                EnsureChildControls();
                return _textBoxName.ClientID;
            }
        }

        public override ControlCollection Controls
        {
            get
            {
                EnsureChildControls();
                return base.Controls;
            }
        }

        [Category("Appearance")]
        [DefaultValue("")]
        public string Text
        {
            get
            {
                EnsureChildControls();
                return ViewState["Text"] == null ? _hiddenField.Value : ViewState["Text"].ToString();
            }
            set
            {
                EnsureChildControls();
                ViewState["Text"] = value;
            }
        }

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //复合控件中隱藏文本框的ID
        public string HiddenFieldID 
        {
            get
            {
                EnsureChildControls();
                return "hid"+this.FieldName+"Id";
            }
        }

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //复合控件中CODE文本框的ID
        public string TextBoxCodeID
        {
            get
            {
                EnsureChildControls();
                return "txt" + this.FieldName + "Code";
            }
        }

        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //复合控件中Name文本框的ID
        public string TextBoxNameID
        {
            get
            {
                EnsureChildControls();
                return "txt" + this.FieldName + "Name";
            }
        }

        private string _FieldName = "";
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        [Description("用於生成ID的特定字符串")]
        public string FieldName
        {
            get 
            {
                EnsureChildControls();
                return _FieldName;
            }
            set
            {
                EnsureChildControls();
                _FieldName = value;
            }
        }

        private string _BaseDataType = "";
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        [Description("基礎資料的類型")]
        public string BaseDataType
        {
            get
            {
                EnsureChildControls();
                return _BaseDataType;
            }
            set
            {
                EnsureChildControls();
                _BaseDataType = value;
            }
        }

        private string _BaseDataUrl = "";
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        [Description("選擇基礎資料的頁面地址")]
        public string BaseDataUrl
        {
            get
            {
                EnsureChildControls();
                return _BaseDataUrl;
            }
            set
            {
                EnsureChildControls();
                _BaseDataUrl = value;
            }
        }

        private string _BaseDataID = "";
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        [Description("基礎資料的ID")]
        public string BaseDataID
        {
            get
            {
                EnsureChildControls();
                if (_BaseDataID != "")
                {
                    return _BaseDataID;
                }
                else
                {
                    return _hiddenField.Value;
                }
            }
            set
            {
                EnsureChildControls();
                _BaseDataID = value;
            }
        }

        private string _BaseDataCode = "";
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        [Description("基礎資料的Code")]
        public string BaseDataCode
        {
            get
            {
                EnsureChildControls();
                if (_BaseDataCode != "")
                {
                    return _BaseDataCode;
                }
                else
                {
                    return _textBoxCode.Text;
                }
            }
            set
            {
                EnsureChildControls();
                _BaseDataCode = value;
            }
        }

        private string _BaseDataName = "";
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        [Description("基礎資料的Code")]
        public string BaseDataName
        {
            get
            {
                EnsureChildControls();
                if (_BaseDataName != "")
                {
                    return _BaseDataName;
                }
                else
                {
                    return _textBoxName.Text;
                }
            }
            set
            {
                EnsureChildControls();
                _BaseDataName = value;
            }
        }

        protected override void CreateChildControls()
        {
            Controls.Clear();
            //_hiddenField = new HiddenField();
            _hiddenField.ValueChanged += new EventHandler(_hiddenField_ValueChanged);
            //_textBoxCode = new TextBox();
            _textBoxCode.TextChanged += new EventHandler(_hiddenField_ValueChanged);
            //_textBoxName = new TextBox();
            //_hiddenField.ID = HiddenFieldID;
            //_textBoxCode.ID = TextBoxCodeID;
            _textBoxCode.BackColor = ColorTranslator.FromHtml("#F0F0F0");
            _textBoxCode.Attributes.Add("disabled", "disabled");
            _textBoxCode.Width = Unit.Parse("48px");
            _textBoxCode.Height = Unit.Parse("15px");
            _textBoxCode.BorderWidth = Unit.Parse("0px");
            //_textBoxName.ID = TextBoxNameID;
            _textBoxName.BackColor = ColorTranslator.FromHtml("#F0F0F0");
            _textBoxName.Attributes.Add("disabled", "disabled");
            _textBoxName.Width = Unit.Parse("120px");
            _textBoxName.BorderWidth = Unit.Parse("0px");
            Controls.Add(_hiddenField);
            Controls.Add(_textBoxCode);
            Controls.Add(_textBoxName);
        }

        private void _hiddenField_ValueChanged(object sender, EventArgs e)
        {
            BaseDataID = _hiddenField.Value;
        }

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            _hiddenField.ID = HiddenFieldID;
            _textBoxName.ID = TextBoxNameID;
            _textBoxCode.ID = TextBoxCodeID;
        }

        ///
        /// 将此控件呈现给指定的输出参数。
        ///
        /// 要写出到的 HTML 编写器
        protected override void Render(HtmlTextWriter output)
        {
            EnsureChildControls();
            output.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");
            output.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
            output.AddAttribute(HtmlTextWriterAttribute.Border,"0");
            output.AddAttribute(HtmlTextWriterAttribute.Style, "border:solid 1px #AECAF0;border-collapse:collapse; background:#F0F0F0;");

            output.RenderBeginTag(HtmlTextWriterTag.Table);

            output.RenderBeginTag(HtmlTextWriterTag.Tr);

            output.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "0px");
            output.RenderBeginTag(HtmlTextWriterTag.Td);
            //_hiddenField.ID = HiddenFieldID;
            //_hiddenField.Value = BaseDataID;
            //_textBoxCode.ID = TextBoxCodeID;
            //_textBoxCode.Text = BaseDataCode;
            _hiddenField.RenderControl(output);
            _textBoxCode.RenderControl(output);
            output.RenderEndTag();

            output.AddAttribute(HtmlTextWriterAttribute.Style, "border-left:solid 1px #AECAF0; border-right:solid 1px #AECAF0; background:#D4D4D4;");
            output.RenderBeginTag(HtmlTextWriterTag.Td);

            //output.AddAttribute(HtmlTextWriterAttribute.Id, "xxx"+HiddenFieldID);
            output.AddAttribute(HtmlTextWriterAttribute.Src, this.Page.ClientScript.GetWebResourceUrl(this.GetType(), "CreateTech.Retail.ServerControl.Resources.base_data_select.jpg"));
            output.AddAttribute(HtmlTextWriterAttribute.Style, "border:0px; width:20px; height:20px; cursor:pointer;");
            output.AddAttribute(HtmlTextWriterAttribute.Onclick, "if(typeof(popupURL)!=\"undefined\"){popupURL.SetContentHTML('');popupURL.SetContentUrl('" + BaseDataUrl + "?id="+HiddenFieldClientID+"&code="+TextBoxCodeClientID+"&name="+TextBoxNameClientID+"&t=" + BaseDataType + "&sid=" + FieldName + "&v='+(new Date()).getTime());popupURL.Show();}");
            output.RenderBeginTag(HtmlTextWriterTag.Img);
            output.RenderEndTag();
            output.RenderEndTag();

            output.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "0px");
            output.RenderBeginTag(HtmlTextWriterTag.Td);
            //_textBoxName.ID = TextBoxNameID;
            _textBoxName.Text = BaseDataName;
            _textBoxName.RenderControl(output);
            output.RenderEndTag();

            output.RenderEndTag();

            output.RenderEndTag();
        }
    }
}<cc1:BaseDataSelecter ID="txtBrand" runat="server" FieldName="Brand" BaseDataType="10000" BaseDataUrl="PopupControl/SelectBaseData.aspx" /><%@ Register Assembly="CreateTech.Retail.ServerControl" Namespace="CreateTech.Retail.ServerControl"
    TagPrefix="cc1" %>