在用ajax开发asp.net程序里.利用ashx页面与前台页面进行数据交互.但是每个ajax交互都需要一个ashx页面.结果是项目里一大堆ashx页面.使项目难以管理.现在我们就想办法让一个ashx页面里允许多个ajax交互;
前台页面AjaxTest.htm,内容如下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>本页用不同的方式与后台进行交互</title>
<script type="text/javascript" src="JS/jquery-1.4.2.min.js"></script>
<script type="text/javascript" >
//使用jquery库进行ajax交互
$(document).ready(function(){
//进行一个ajax请求,command告诉后台调用哪个方法
$.get("Handler.ashx",{command:"method1",value:"chentao"},function(data){
alert(data);
});
//进行一个ajax请求,command告诉后台调用method2方法
$.get("Handler.ashx",{command:"method2",value:"tangyu"},function(data){
alert(data);
})
</script>
</head>
<body>
</body>
</html>
后台建立一个Handler.ashx页面 内容如下
<%@ WebHandler Language="C#" class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
if (context.Request["command"]!=null)
{
//得到前台传过来的command,确定调用哪个方法
string command = context.Request["command"].ToString();
string data = context.Request["value"].ToString();
switch (command)
{
case "method1":
method1(context);
break;
case "method2":
method2(context);
break;
default:
break;
}
}
}
public bool IsReusable {
get {
return false;
}
}
public void method1(HttpContext context)
{
context.Response.Write("hello,"+context.Request["value"].ToString());
}
public void method2(HttpContext context)
{
context.Response.Write("hello,"+context.Request["value"].ToString());
}
}
如果有多个方法,switch case里的判断将会很多.考虑用更简单的方法.使用反射
<%@ WebHandler Language="C#" class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
if (context.Request["command"] != null)
{
//
string command = context.Request["command"].ToString();
System.Reflection.MethodInfo method = this.GetType().GetMethod(command);
if (method != null)
{
method.Invoke(this, new object[] { context});
}
}
}
public bool IsReusable {
get {
return false;
}
}
public void method1(HttpContext context)
{
context.Response.Write("hello"+context.Request["value"].ToString());
}
public void method2(HttpContext context)
{
context.Response.Write("hello,"+context.Request["value"].ToString());
}
}
使用反射大大简化了程序.
=====================================================
使用aspx页面与ajax交互
新建一个aspx页面 WebMethod.aspx
将WebMethod.aspx页里的多余部分删除,只保留
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="WebMethod.aspx.cs" Inherits="WebMethod" %>
这一条语句
WebMethod.aspx.cs内容如下
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.Services;
using System.Reflection;
public partial class WebMethod : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string methodName = HttpContext.Current.Request.PathInfo.Substring(1);
// Response.Write(methodName);
MethodInfo method = this.GetType().GetMethod(methodName);
if (method != null)
{
Response.Write(method.Invoke(this,new object[]{}));
}
// Response.Write(GetResult());
}
[WebMethod(EnableSession=true)]
public string GetResult()
{
//return "hello";
if (HttpContext.Current.Request["name"] != null)
{
string value = HttpContext.Current.Request["name"].ToString();
//HttpContext.Current.Request.PathInfo;
return "{'name':'"+value+"'}";
}
else
{
return "{name:'error'}";
}
}
}
test.html页面与WebMethod.aspx页面进行ajax交互 test.html页面内容
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>使用aspx页面进行交互</title>
<script type="text/javascript" src="JS/jquery-1.4.2.min.js"></script>
<script type="text/javascript" >
$(document).ready(function(){
$.ajax({
type: "POST",
url: "WebMethod.aspx/GetResult",
data: "name=chentao",
dataType: "text",
success: function(d){
alert(d);
}
});
});
</script>
</head>
<body>
</body>
</html>