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http://chs.gotdotnet.com/quickstart/aspplus/doc/webctrlauthoring.aspx

http://www.codeproject.com上一大把

只有codebehind，用c#写的，实现方法：通过webservice，函数接口是
DataSet GetNewsForNewsPanel((int)this.NewsNum,this.NewsKind,this.BeginTime,this.EndTime),返回一个数据集，
控件的功能就是显示数据集中的新闻namespace NewsList
{
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.UI;
using System.Collections; /// <summary>
/// NewsList 的摘要说明。
/// </summary>
public abstract class NewsList : System.Web.UI.UserControl
{
private WebApplication4.Cnews.CNews DataSource;//web service实例
private DataSet news;//保存从web service获得满足条件的新闻
private string title="=demo=";//新闻标题
private string newskind="sports";//新闻种类
private uint newsnum=5;//新闻数量
private DateTime begintime=DateTime.MinValue;//起始时间
private DateTime endtime=DateTime.Now;//结束时间
private string height="240px";//控件高度
private string width="298px";//控件宽度
private uint maxLineWordCount=20;//一行最多能显示的字数
public string Title
{
get
{
return title;
}
set
{
title=value;
}
}
public string NewsKind
{
get
{
return newskind;
}
set
{
newskind=value;
}
}
public uint NewsNum
{
get
{
return newsnum;
}
set
{
newsnum=value;
}
}
public DateTime BeginTime
{
get
{
return begintime;
}
set
{
begintime=value;
}
}
public DateTime EndTime
{
get
{
return endtime;
}
set
{
endtime=value;
}
}
public string Height
{
get
{
return height;
}
set
{
height=value;
}
}
public string Width
{
get
{
return width;
}
set
{
width=value;
}
}
public uint MaxLineWordCount
{
get
{
return maxLineWordCount;
}
set
{
maxLineWordCount=value;
}
}
protected override void Render(HtmlTextWriter output)
{
int maxRows = (int)NewsNum;
const int maxCols = 1;
output.WriteLine();
//output.WriteFullBeginTag("h1");
//output.Write("Using the HtmlTextWriterClass");
//output.WriteEndTag("h1");
// ...
output.Write("<div name="+this.UniqueID+" style='background-color:white;border-style:Redge;border-color:blue;height:"+this.Height+";width:"+this.Width+";'"+">");
output.WriteLine();
output.Indent++; output.WriteBeginTag("table");
//output.AddStyleAttribute(HtmlTextWriterStyle.FontWeight, "bold");
//output.AddStyleAttribute(HtmlTextWriterStyle.FontFamily, "verdana");
//output.AddStyleAttribute(HtmlTextWriterStyle.FontSize, "14pt");
//output.AddStyleAttribute(HtmlTextWriterStyle.Width,"295px");
//output.Write("style='font-size:x-small;OVERFLOW:hidden;WIDTH:295px;HEIGHT:167px;TEXT-ALIGN:center'");
output.WriteAttribute("border","0");
output.Write(" style='WIDTH:"+this.Width+";HEIGHT:"+Convert.ToString(20*this.NewsNum)+"px;'");
output.Write(HtmlTextWriter.TagRightChar);
output.WriteLine();
output.WriteFullBeginTag("tr");
output.WriteLine(); output.Indent++;
output.WriteBeginTag("td");
output.WriteAttribute("valign","top");
output.WriteAttribute("bgcolor","lightblue");
output.Write(" style='height:20px;'");
output.Write(HtmlTextWriter.TagRightChar);
//output.Write("Cell (" + i.ToString() + "," + j.ToString() + ")" );
output.Write(this.Title);
output.WriteEndTag("td");
output.WriteLine(); output.Indent--;
output.WriteEndTag("tr");
output.WriteLine();
output.Indent++;
for (int i=0; i<maxRows; i++)
{ output.WriteFullBeginTag("tr");
output.WriteLine(); output.Indent++;
for (int j=0; j<maxCols; j++)
{ output.WriteBeginTag("td");
output.WriteAttribute("valign","top");
output.WriteAttribute("bgcolor","white");
output.Write(" style='height:25px;'");
output.Write(HtmlTextWriter.TagRightChar);
//output.Write("Cell (" + i.ToString() + "," + j.ToString() + ")" ); output.WriteLine();
output.Write(" <a href="+"'http://wallffpp/WebApplication4/WebForm1.aspx?NewsID'>");
if(news.Tables["新闻"].Rows[i].ItemArray[1].ToString().Length>(int)(this.MaxLineWordCount))
{
output.Write(news.Tables["新闻"].Rows[i].ItemArray[1].ToString().Substring(0,(int)(this.MaxLineWordCount)));
output.Write("...");
}
else
{
output.Write(news.Tables["新闻"].Rows[i].ItemArray[1].ToString());
}
output.Write("</a>");
output.WriteLine();
output.WriteEndTag("td");
output.WriteLine();
} output.Indent--;
output.WriteEndTag("tr");
output.WriteLine();
}
output.Indent--; // ...
output.WriteEndTag("table");
output.WriteLine();
output.Indent--;
output.Write("</div>"); }
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
DataSource=new WebApplication4.Cnews.CNews();
news=DataSource.GetNewsForNewsPanel((int)this.NewsNum,this.NewsKind,this.BeginTime,this.EndTime);
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// 设计器支持所需的方法 - 不要使用
/// 代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load); }
#endregion
}
}

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Resources;
using System.Web.UI.Design;namespace drk.WebControls { /// <summary>
/// Provides a numeric up-down control.
/// </summary>
/// <res>
/// This control is generally combined with a compare validator used to ensure only numbers are entered.
/// </res>
/// <example>
/// Here is a simple example using the UpDown control.
/// <code><![CDATA[
/// <%@ Register TagPrefix="mbud" Namespace="MetaBuilders.WebControls" Assembly="MetaBuilders.WebControls.UpDown" %>
/// <html><body><form runat="server">
/// <p>
/// <asp:CompareValidator runat="server" ControlToValidate="UpDown1" Type="Double" Operator="DataTypeCheck" ErrorMessage="Number Required" Display="Static" />
/// <mbud:UpDown id="UpDown1" runat="server" Increment="1" UpImageUrl="up.gif" DownImageUrl="down.gif" />
/// <asp:Button runat="server" text="smack" />
/// </p>
/// </form></body></html>
/// ]]></code>
/// </example>
[
DefaultEvent("TextChanged"),
DefaultProperty("Text"),
ValidationPropertyAttribute("Text")
]
public class UpDown : System.Web.UI.WebControls.WebControl, INamingContainer { /// <summary>
/// Creates a new instance of the <see cref="UpDown"/> control.
/// </summary>
public UpDown() : base() {
} #region Style transference
/// <summary>
/// Applies <see cref="WebControl.BackColor"/> to the Textbox area of the control.
/// </summary>
public override System.Drawing.Color BackColor {
get {
this.EnsureChildControls();
return this.textBox.BackColor;
}
set {
this.EnsureChildControls();
this.textBox.BackColor = value;
}
} /// <summary>
/// Applies <see cref="WebControl.BorderColor"/> to the Textbox area of the control.
/// </summary>
public override System.Drawing.Color BorderColor {
get {
this.EnsureChildControls();
return this.textBox.BorderColor;
}
set {
this.EnsureChildControls();
this.textBox.BorderColor = value;
}
} /// <summary>
/// Applies <see cref="WebControl.BorderStyle"/> to the Textbox area of the control.
/// </summary>
public override System.Web.UI.WebControls.BorderStyle BorderStyle {
get {
this.EnsureChildControls();
return this.textBox.BorderStyle;
}
set {
this.EnsureChildControls();
this.textBox.BorderStyle = value;
}
} /// <summary>
/// Applies <see cref="WebControl.BorderWidth"/> to the Textbox area of the control.
/// </summary>
public override System.Web.UI.WebControls.Unit BorderWidth {
get {
this.EnsureChildControls();
return this.textBox.BorderWidth;
}
set {
this.EnsureChildControls();
this.textBox.BorderWidth = value;
}
} /// <summary>
/// Applies <see cref="WebControl.CssClass"/> to the Textbox area of the control.
/// </summary>
public override string CssClass {
get {
this.EnsureChildControls();
return this.textBox.CssClass;
}
set {
this.EnsureChildControls();
this.textBox.CssClass = value;
}
} /// <summary>
/// Applies <see cref="WebControl.Font"/> to the Textbox area of the control.
/// </summary>
public override System.Web.UI.WebControls.FontInfo Font {
get {
this.EnsureChildControls();
return this.textBox.Font;
}
} /// <summary>
/// Applies <see cref="WebControl.ForeColor"/> to the Textbox area of the control.
/// </summary>
public override System.Drawing.Color ForeColor {
get {
this.EnsureChildControls();
return this.textBox.ForeColor;
}
set {
this.EnsureChildControls();
this.textBox.ForeColor = value;
}
} /// <summary>
/// Applies <see cref="WebControl.Height"/> to the Textbox area of the control.
/// </summary>
public override System.Web.UI.WebControls.Unit Height {
get {
this.EnsureChildControls();
return this.textBox.Height;
}
set {
this.EnsureChildControls();
this.textBox.Height = value;
}
}
/// <summary>
/// Applies <see cref="WebControl.TabIndex"/> to the Textbox area of the control.
/// </summary>
public override short TabIndex {
get {
this.EnsureChildControls();
return this.textBox.TabIndex;
}
set {
this.EnsureChildControls();
this.textBox.TabIndex = value;
}
} /// <summary>
/// Applies <see cref="WebControl.ToolTip"/> to the Textbox area of the control.
/// </summary>
public override string ToolTip {
get {
this.EnsureChildControls();
return this.textBox.ToolTip;
}
set {
this.EnsureChildControls();
this.textBox.ToolTip = value;
}
}

/// <summary>
/// Applies <see cref="WebControl.Width"/> to the Textbox area of the control.
/// </summary>
public override System.Web.UI.WebControls.Unit Width {
get {
this.EnsureChildControls();
return this.textBox.Width;
}
set {
this.EnsureChildControls();
this.textBox.Width = value;
}
}
#endregion /// <summary>
/// Gets or sets the image to display for the "Up" button.
/// </summary>
/// <res>Clicking on this image will increment the value.</res>
[
Editor("System.Web.UI.Design.ImageUrlEditor","System.Drawing.Design.UITypeEditor"),
Bindable(true),
Category("Appearance"),
DefaultValue("")
]
public virtual String UpImageUrl {
get {
this.EnsureChildControls();
return this.up.ImageUrl;
}
set {
this.EnsureChildControls();
this.up.ImageUrl = value;
}
} /// <summary>
/// Gets or sets the image to display for the "Down" button.
/// </summary>
/// <res>Clicking on this image will decrement the value.</res>
[
Editor("System.Web.UI.Design.ImageUrlEditor","System.Drawing.Design.UITypeEditor"),
Bindable(true),
Category("Appearance"),
DefaultValue("")
]
public virtual String DownImageUrl {
get {
this.EnsureChildControls();
return this.down.ImageUrl;
}
set {
this.EnsureChildControls();
this.down.ImageUrl = value;
}
} /// <summary>
/// Gets or sets the displayed value of the control.
/// </summary>
[
Bindable(true),
Category(""),
DefaultValue("")
]
public virtual String Text {
get {
this.EnsureChildControls();
return this.textBox.Text;
}
set {
this.EnsureChildControls();
this.textBox.Text = value;
}
} /// <summary>
/// Gets or sets the amount which the up or down buttons will change the value.
/// </summary>
[
Bindable(true),
Category("Behavior"),
DefaultValue(10)
]
public virtual Decimal Increment {
get {
Object savedState = this.ViewState["Increment"];
if ( savedState != null ) {
return (Decimal)savedState;
}
return 10;
}
set {
this.ViewState["Increment"] = value;
}
} /// <summary>
/// Occurs when the <see cref="UpDown.Text"/> property has changed.
/// </summary>
public event EventHandler TextChanged; /// <summary>
/// Raises the <see cref="UpDown.TextChanged"/> event.
/// </summary>
protected virtual void OnTextChanged( EventArgs e ) {
if ( this.TextChanged != null ) {
this.TextChanged( this, e );
}
} private void bubbleTextChanged( Object sender, EventArgs e ) {
this.OnTextChanged(e);
} private Table layout;
private TextBox textBox;
private System.Web.UI.WebControls.HyperLink up;
private System.Web.UI.WebControls.HyperLink down; /// <summary>
/// Overrides <see cref="Control.CreateChildControls"/>
/// </summary>
protected override void CreateChildControls() {
layout = new Table();
textBox = new TextBox();
up = new HyperLink();
down = new HyperLink(); this.textBox.TextChanged += new EventHandler( bubbleTextChanged );
this.textBox.Style["text-align"] = "right";
this.textBox.ID = "textBox";
this.textBox.Style["margin"] = "0px"; this.up.Text = "up";
this.down.Text = "down";
layout.CellPadding = 0;
layout.CellSpacing = 0;
layout.BorderWidth = 0;
layout.Rows.Add( new TableRow() );
layout.Rows.Add( new TableRow() );
layout.Rows[0].Cells.Add( new TableCell() );
layout.Rows[0].Cells[0].RowSpan = 2;
layout.Rows[0].Cells[0].Attributes["valign"] = "middle";
layout.Rows[0].Cells.Add( new TableCell() );
layout.Rows[1].Cells.Add( new TableCell() ); layout.Rows[0].Cells[0].Controls.Add( textBox );
layout.Rows[0].Cells[1].Controls.Add( up );
layout.Rows[1].Cells[ layout.Rows[1].Cells.Count - 1].Controls.Add( down ); this.Controls.Add( layout );
} /// <summary>
/// Overrides <see cref="Control.OnPreRender"/>
/// </summary>
protected override void OnPreRender(System.EventArgs e) {
base.OnPreRender(e);
this.RegisterClientScript();
} /// <summary>
/// Overrides <see cref="Control.Render"/>
/// </summary>
protected override void Render(HtmlTextWriter writer ) {
this.EnsureChildControls();
this.layout.Height = this.Height;
this.textBox.Enabled = this.Enabled;
this.up.Enabled = this.Enabled;
this.down.Enabled = this.Enabled;
base.Render(writer);
} /// <summary>
/// Registers ClientScript with the Page.
/// </summary>
protected virtual void RegisterClientScript() {
if ( this.Enabled ) {
if( !Page.IsClientScriptBlockRegistered( "yearUpDown Library" ) ) {
ResourceManager manager = new ResourceManager( this.GetType() );
//从系统类库中抓取往页面写入要用到的JSP函数.
String script = manager.GetResourceSet(System.Globalization.CultureInfo.CurrentCulture, true, true).GetString("LibraryScript");
this.Page.RegisterClientScriptBlock("yearUpDown Library", script );
} this.up.NavigateUrl = "javascript: UpDown_Increment( '" + this.textBox.UniqueID + "', " + this.Increment.ToString() + " );";
this.down.NavigateUrl = "javascript: UpDown_Decrement( '" + this.textBox.UniqueID + "', " + this.Increment.ToString() + " );";
}
} }
}

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