.net通过一般处理程序模拟用户控件数据保持、Ispostback 【第二版将html与ashx文件分开】

直接上代码:

HTML代码,其中表单中input标签中的value值首先用一个占位符占位,然后在ashx中将其替换

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title></title>

</head>

<body>

<form action = "02jsqHandler.ashx" method = "post">

    <input type = "text" name = "txtNum1" value = "@txtNum1" />+

    <input type = "text" name = "txtNum2" value = "@txtNum2" />

    =<input type = "text" name = "txtResult" value = "@txtResult" />

    <input type = "hidden" name = "IsPostBack" value = "false" />

    <input type = "submit"  value = "计算" />

</form>

</body>

</html>

ashx代码:

首先用io中的File.ReadAllText()方法将html文件读出来

public class _02jsqHandler : IHttpHandler {

    

    public void ProcessRequest (HttpContext context) {

        context.Response.ContentType = "text/html";

        //获得html文件的内容

        string path = context.Server.MapPath("03jsq2.htm");

        string strHtml = File.ReadAllText(path);

        //声明三个整形变量

        int n1 = 0, n2 = 0, result = 0;

        bool ispostback = Convert.ToBoolean(context.Request.Form["IsPostBack"]);

        if (!ispostback)  //判断是否是第一次加载相当于aspx.cs中的IsPostBack

        {

            //分别获得数1和数2

            string sn1 = context.Request.Form["txtNum1"];

            string sn2 = context.Request.Form["txtNum2"];

            if (int.TryParse(sn1, out n1) && int.TryParse(sn2, out n2))

            {

                result = n1 + n2;

            }

            //context.Response.Write(result.ToString());

        }

        //将html中的@参数(占位符替换为对应的数据)

        strHtml = strHtml.Replace("@txtNum1", n1.ToString())

            .Replace("@txtNum2", n2.ToString())

            .Replace("@txtResult", result.ToString());

        //将html写回页面

        context.Response.Write(strHtml);

    }

 

    public bool IsReusable {

        get {

            return false;

        }

    }

 

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