Asp.net 基础3（自定义控件的使用）

首先是自定义控件的实现

继承Control 添加自定义属性，然后重写Render方法，此方法用于向外输出改控件

代码

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;

namespace OwnControl
{
    public class NameControl : Control
    {
        private string name;
        private bool isImport;

        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }

        public bool IsImport
        {
            get
            {
                return isImport;
            }
            set
            {
                isImport = value;
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            string txt;
            if(isImport)
                txt=string.Format("<h1>{0}</h1>",name);
            else
                txt=string.Format("<h2>{0}</h2>",name);
            writer.Write(txt);
        }
    }
}

把上述的文件写到单独的类工程里，编译通过。在web项目添加该项目的引用。

然后再asp.net 页面里使用该控件。

注册控件：<%@ Register Namespace="OwnControl" TagPrefix="useown" Assembly="OwnControl" %>

使用控件：<useown:NameControl ID="use1" runat="server" Name="yijianliang" IsImport="true"></useown:NameControl>

代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="UseOwnControlForm.aspx.cs" Inherits="TestCodeBehind.UseOwnControlForm" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Namespace="OwnControl" TagPrefix="useown" Assembly="OwnControl" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <useown:NameControl  ID="use1" runat="server" Name="yijianliang" IsImport="true"></useown:NameControl>
    <useown:NameControl  ID="user2" runat="server" Name="yijianxiang" IsImport="false"></useown:NameControl>
    </div>
    </form>
</body>
</html>