步步为营-68-asp.net简单练习(get set)

1 加法计算器

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

namespace _01加法计算器
{
    /// <summary>
    /// AddCalculator 的摘要说明
    /// </summary>
    public class AddCalculator : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            StringBuilder sb = new StringBuilder();
            //判断是否是第一次请求
            int num1, num2, result;

            if (string.IsNullOrEmpty(context.Request["num2"]))
            {
                num1 = num2 = result = 0;
            }
            else {
                num1 = int.Parse(context.Request["num1"]);
                num2 = int.Parse(context.Request["num2"]);
                result = num1 + num2;
            }
            sb.Append("<form method='post'>");
            sb.Append(" <input type='text' name='num1' value='$num1' />");
            sb.Append("  &nbsp;   +    &nbsp;");
            sb.Append(" <input type='text' name='num2' value='$num2' />");            
            sb.Append("  &nbsp;   <input type='submit' value='='/>    &nbsp;");
            sb.Append(" <input type='text' name='result' value='$result' />");
            sb.Append("</form>");
            string html = sb.ToString().Replace("$num1", num1.ToString()).Replace("$num2", num2.ToString()).Replace("$result", result.ToString());

            context.Response.Write(html);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

AddCalculator

1.2 实现效果

1.3 分析:每次需要拼接字符串,然后替换太复杂

2 div的增长

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <div style="border: 1px solid red;  @divLenpx; height: @divLenpx; " >
        <form   action="DivAdd.ashx">
            <input type="hidden" name="divLen" value="@divLen" />
            <input type="submit" name="sbmt" value="长" />
        </form>
    </div>
</body>
</html>

DivAdd.html

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;

namespace _02Div的增长
{
    /// <summary>
    /// DivAdd 的摘要说明
    /// </summary>
    public class DivAdd : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            int divlen =50;
           
            if (context.Request["divLen"] != null)
            {
                divlen = int.Parse(context.Request["divLen"]);
               divlen = divlen + 10;
            }
           
            //关键来了,看如何将HTML代码读入的
            string html = File.ReadAllText(Path.Combine(AppDomain.CurrentDomain.BaseDirectory,"DivAdd.html"));
            //字符串的替换
            html = html.Replace("@divLen",divlen.ToString());
            context.Response.Write(html);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

DivAdd.ashx

2.1 关键代码

　　　　将HTML代码读入的
string html = File.ReadAllText(Path.Combine(AppDomain.CurrentDomain.BaseDirectory,"DivAdd.html"));