Asp. NET custom Web server control-dropdownlist/select drop-down list control

Using system;using system.collections.generic;using system.componentmodel;using system.linq;using System.Text;using System.web;using system.web.ui;using system.web.ui.webcontrols;//Custom Web server Control-drop-down list namespace mycontrols{[ Defaultproperty ("Text")] [ToolBoxData ("<{0}:myselect runat=server></{0}:myselect>")] [ParseChildren (        True, "Items")]//Stipulate public class Myselect:webcontrol {[Bindable (True)] [Category ("appearance")]        [DefaultValue ("")] [Localizable (true)] public string Text {get {string s = (string) views                tate["Text"]; Return ((s = = null)?            STRING.EMPTY:S);            } set {viewstate["Text"] = value; }} [DesignerSerializationVisibility (designerserializationvisibility.content)]//print the label as content public Li                St<selectitem> items{get{if (viewstate["Items"]==null) {viewstate["Items"] = new list<selectitem> ();           } return (list<selectitem>) viewstate["Items";            } set{viewstate["Items"] = value; }} [DesignerSerializationVisibility (designerserializationvisibility.content)]//print the label public in the form of content Siz                    E Size {get {if (viewstate["Size"] = = null) {                viewstate["size"] = new Size ();            } return (size) viewstate["size"];            } set {viewstate["Size"] = value; }} public override void RenderBeginTag (HtmlTextWriter writer) {this. Style.add ("Width", Size.width + "px"); Add style, Width this. Style.add ("Height", Size.Height + "px"); Add style, height base.        RenderBeginTag (writer);          } protected override HtmlTextWriterTag Tagkey {get  {return htmltextwritertag.select;//drop-down list label}}  protected override void RenderContents (HtmlTextWriter output) {//Print drop-down list contents foreach (SelectItem Item in Items) {output. Write ("<option value= '" +item. Value+ "' >" +item.            text+ "</option>"); }        }    }}

　　

Using system;using system.collections.generic;using system.linq;using system.text;//<!-- Custom Server drop-down list control sub-label namespace mycontrols{public    class SelectItem    {public        string value {set; get;}//Selected value Public        string Text {set; get;}//Selected text content public        SelectItem () {} public        SelectItem (string text, String Valu E) {This            . Text = text;            This. value = value;}}}    

　　

Using system;using system.collections.generic;using system.linq;using system.text; <cc1:mybutton id= "MyButton1" size-height= "the" "size-width=" 290  usage, used for this internal attribute//defines a size class, It contains the width of the namespace mycontrols{public   class Size    {public       int width {set; get;}       public int Height {set; get;}       Public Size (Int. width,int height) {this           . width = width;           This. Height = height;       }       Public Size (): This (100,100) {}}    }

　　

<%@ page language= "C #" autoeventwireup= "true" codefile= "Default.aspx.cs" inherits= "_default"%><%@ Register Assembly= "MyControls" namespace= "MyControls" tagprefix= "CC1"%><! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
　　
 ASP. NET custom Web server control-dropdownlist/select drop-down list control