ASP.NET2.0自定义控件开发(3) ----给控件添加下拉列表属性

3.给控件添加下拉列表属性

 

using  System; using  System.Web.UI; using  System.Web.UI.WebControls; using  System.ComponentModel; namespace  CustomControls ... {    /**//// <summary>    /// Summary description for LabelTextBox    /// </summary>    public class LabelTextBox : Control    ...{        private string _labelText="LabelText";        private string _textBoxText = "";        [Browsable(true),         Description("获取和设置Label文本"),         DefaultValue("LabelText"),         Category("Appearance")        ]        public virtual string Title        ...{            get ...{ return _labelText; }            set ...{ _labelText = value; }        }        [Browsable(true),         Description("获取和设置TextBox文本"),         DefaultValue(""),         Category("Appearance")        ]        public virtual string Text        ...{            get ...{ return _textBoxText; }            set ...{ _textBoxText = value; }        }        [Browsable(true),         Description("获取和设置TextBox的显示方式"),         DefaultValue(""),         Category("Appearance")        ]        public virtual TextBoxMode TextMode        ...{            get            ...{                object _textMode = ViewState["TextMode"];                if (_textMode == null)                    return TextBoxMode.SingleLine;                else                    return (TextBoxMode)_textMode;            }            set            ...{                ViewState["TextMode"] = value;            }        }        protected override void Render(HtmlTextWriter writer)        ...{            Page.VerifyRenderingInServerForm(this);            if (TextMode == TextBoxMode.SingleLine)            ...{                writer.Write("<table style='width:180px;height:25px;border-width:0;'>");                writer.Write("<tr>");                writer.Write("<td><strong>" + _labelText + "</strong></td>");                writer.Write("<td><input name='TextBox' id='TextBox' type='text' /></td>");                writer.Write("</tr>");                writer.Write("</table>");            }            else if (TextMode == TextBoxMode.MultiLine)            ...{                writer.Write("<table style='width:180px;height:25px;border-width:0;'>");                writer.Write("<tr valign='top'>");                writer.Write("<td><strong>" + _labelText + "</strong></td>");                writer.Write("<td><textarea name='TextBox' id='TextBox' /></td>");                writer.Write("</tr>");                writer.Write("</table>");            }            else if (TextMode == TextBoxMode.Password)            ...{                writer.Write("<table style='width:180px;height:25px;border-width:0;'>");                writer.Write("<tr>");                writer.Write("<td><strong>" + _labelText + "</strong></td>");                writer.Write("<td><input name='TextBox' id='TextBox' type='password' /></td>");                writer.Write("</tr>");                writer.Write("</table>");            }            base.Render(writer);        }    }}