好久不问问题了~想知道下asp.net是如何编写自己的控件的，就像AspNetPager...

Question

如题请教~

Answer 1

Imports System
Imports System.ComponentModel
Imports System.Drawing.Design
Imports System.Security.Permissions
Imports System.Web
Imports System.Web.UI
Namespace JYL
    <Designer(GetType(ContainerDesigner)), PersistChildren(True), ParseChildren(False), ToolboxData("<{0}:myPanel runat=server>myPanel</{0}:myPanel>")> _
    Public Class myPanel
        Inherits WebCommon        Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
            writer.RenderBeginTag(HtmlTextWriterTag.Table)
            writer.RenderBeginTag(HtmlTextWriterTag.Tr)
            Dim II As Integer
            For II = 1 To Me.Controls.Count - 1
                writer.AddAttribute("Align", "Center")
                writer.AddAttribute("width", "30%")
                writer.RenderBeginTag(HtmlTextWriterTag.Td)
                Me.Controls(II).RenderControl(writer)
                writer.RenderEndTag()
            Next
            writer.RenderEndTag()
            writer.RenderEndTag()
        End Sub
    End Class    Public Class ContainerDesigner
        Inherits System.Web.UI.Design.ContainerControlDesigner
        Private _style As WebControls.Style = Nothing        Public Overrides ReadOnly Property FrameCaption() As String
            Get
                Return ""
            End Get
        End Property        Public Overrides ReadOnly Property FrameStyle() As WebControls.Style
            Get
                If _style Is Nothing Then
                    _style = New WebControls.Style()
                    _style.Font.Name = "宋体"
                    _style.Font.Size = New WebControls.FontUnit("12px")
                    _style.BackColor = Drawing.Color.LavenderBlush
                    _style.ForeColor = Drawing.Color.DarkBlue
                End If
                Return _style
            End Get
        End Property
    End Class
End Namespace

Answer 2

给你个简单的容器控件，实际上控件不管是CS还是BS，都是有章可循——做这个上瘾，呵呵；将自己的构思放入里面，无外乎就是继承、属性、输入、数据、泛型、接口等等的组合，实际上高深的东西，用上的不多；
││博客空间：http://blog.csdn.net/lovingkiss
││资源下载：http://download.csdn.net/user/lovingkiss
││Email：[e-mail] [MSN也是这个]
││联系方式：Ｑ66840199 项目、聊天、咨询、探讨、统统收费，呵呵......
╚---------------------------------------------------------------------------------------------------------ō*︻$▅▆▇◤ 

Answer 3

继承WebControl  或者 control  就可以了

Answer 4

AspNetPager这种控件 叫服务器控件
可以买书看<<ASP.NET服务器控件开发技术与实例>> 
也可以搜索一下,有不少经典的教程.

Answer 5

哇``发现lovingkiss就是早上路过的那篇很风骚的帖子的很风骚的lz..
你在2楼写的那个是？？
我<-菜鸟,不是很明白额..
应该怎么用的..

Answer 6

额``那段代码是visual basic吧``貌似不能运行啊~

Answer 7

添加个.ascx文件也可以的！！

Answer 8

给你一个小例子:using System;
using System.Text;
using System.Web.UI;namespace Diancheng.Controls
{
    /// <summary>
    /// 这是个简单的例子，有点类似于 Literal 的效果
    /// </summary>
    public class RequiredStar : Control
    {
        private string _text;        protected override void Render(HtmlTextWriter writer)
        {
            writer.RenderBeginTag(HtmlTextWriterTag.Span);
            writer.WriteLine(Text);
            writer.RenderEndTag();
        }        public string Text
        {
            get { return (string.IsNullOrEmpty(_text)) ? "*" : _text; }
            set { _text = value; }
        }
    }
}

Answer 9

是用render 重写出来的.weisEditor 是个源码开放的 在线编辑器可以去下载看看.

Answer 10

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace pager
{
    public class Mypg : System.Web.UI.Control
    {        private int _pgcount = 10;
        private string _query_string = string.Empty;
        private int _pgidx = 1;
        private int _pgsize = 20;
        public virtual int pgcount
        {
            get { return this._pgcount; }
            set { this._pgcount = value; }
        }        public virtual string query_string
        {
            get { return this._query_string; }
            set { this._query_string = value; }
        }        public virtual int pgidx
        {
            get { return this._pgidx; }
            set { this._pgidx = value; }
        }        public virtual int pgsize
        {
            get { return this._pgsize; }
            set { this._pgsize = value; }
        }        protected override void Render(System.Web.UI.HtmlTextWriter writer)
        {
            int allpage = 0;
            int next = 0;
            int pre = 0;
            int startcount = 0;
            int endcount = 0;
            string pagestr = "";
            if (pgidx < 1) { pgidx = 1; }
            //计算总页数
            if (pgsize != 0)
            {
                allpage = (pgcount / pgsize);
                allpage = ((pgcount % pgsize) != 0 ? allpage + 1 : allpage);
                allpage = (allpage == 0 ? 1 : allpage);
            }
            next = pgidx + 1;
            pre = pgidx - 1;
            startcount = (pgidx + 5) > allpage ? allpage - 9 : pgidx - 4;//中间页起始序号
            //中间页终止序号
            endcount = pgidx < 5 ? 10 : pgidx + 5;
            if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数，设置如果小于1就从序号1开始
            if (allpage < endcount) { endcount = allpage; }//页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内
            pagestr = "<DIV class=pages>";
            pagestr += "<EM>共" + allpage + "页&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</EM>";            pagestr += pgidx > 1 ? "<a href=\"" + query_string + "?page=1\">首页</a>&nbsp;&nbsp;<a href=\"" + query_string + "?page=" + pre + "\">上一页</a>" : "<B>首页 上一页</B>";
            //中间页处理，这个增加时间复杂度，减小空间复杂度
            for (int i = startcount; i <= endcount; i++)
            {
                pagestr += pgidx == i ? "&nbsp;&nbsp;<SPAN><B>" + i + "<B></SPAN>" : "&nbsp;&nbsp;<a href=\"" + query_string + "?page=" + i + "\">" + i + "</a>";
            }
            pagestr += pgidx != allpage ? "&nbsp;&nbsp;<a href=\"" + query_string + "?page=" + next + "\">下一页</a>&nbsp;&nbsp;<a href=\"" + query_string + "?page=" + allpage + "\">末页</a>" : " 下一页 末页";
            pagestr += "</DIV>";
            writer.Write(pagestr);
            base.Render(writer);
        }
    }
}

Answer 11

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;namespace Validate
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : System.Web.UI.WebControls.Image
    {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return ((s == null) ? String.Empty : s);
            }            set
            {
                ViewState["Text"] = value;
            }
        }
        private int count;        public int Count
        {
            get { return count; }
            set { count = value; }
        }
        System.Web.UI.WebControls.Image image = new System.Web.UI.WebControls.Image();
        private string MakeValidateCode()
        {
            char[] chars = new char[]{'1','2','3','4','5','6','7','8','9','0'
            ,'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'
            ,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
            Random random = new Random();
            string str = "";
            for (int i = 0; i < Count; i++)
            {
                int index = random.Next(0, chars.Length - 1);
                str += chars.GetValue(index).ToString();
            }
            HttpContext.Current.Session["s"] = str;
            return str;        }
       
        public void CreatePicture(System.Web.UI.WebControls.Image page)
        {
            Bitmap bitmap = new Bitmap(50, 25, PixelFormat.Format24bppRgb);
            Graphics g = Graphics.FromImage(bitmap);
            Brush brush = new LinearGradientBrush(new Point(0, 0), new Point(50, 25), Color.FromArgb(22, 22, 22), Color.FromArgb(255, 222, 0));
            g.FillRectangle(brush, 0, 0, 50, 25);
            g.DrawString(MakeValidateCode(), new Font("黑体", 12, FontStyle.Italic), new SolidBrush(Color.Red), new PointF(2, 2));
            g.Save();
            //MemoryStream ms = new MemoryStream();
            bitmap.Save(this.Context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
            //page.Page.Response.ClearContent();
            //page.Page.Response.ContentType = "image/gif";
            //page.Page.Response.BinaryWrite(ms.ToArray());
            //page.Page.Response.End();
            g.Dispose();
            bitmap.Dispose();
        }
          protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            CreatePicture(image);
        }      
    }
}

Answer 12

weiseditor2.0 新版上线了，功能强大，容易扩展，全源放开放
demo地址：http://www.weiseditor.com/demo.aspx下载地址：http://www.weiseditor.com/down.aspx