谈谈c#中的XML ajax

楼主是指XML WEB Services + AJAX的结合？
AJAX的话微软有写过一套控件,就是updatepanel了，使用起来也很简单，只要一拉。
具体百度asp.net ajax

XML ajax在c#的web项目中是否很常用？
现在的项目中经常用到，当然也要根据项目需求
一般在什么情况用？
web service实现分布式系统的选择。而ajax实现数据无刷新效果，
仍然看项目需要

要怎么学呢？

下载ajax相关组件，按照提供的范例程序，学习。

ajax主要是可以提供友好的用户体验
我在工作中经常用的两种方法是
1、前台:XMLHttpRequest对象 + 后台:ashx文件；
2、ICallbackEventHandler接口(vs2005后才有的)

我用纯 AJAX ，也用 prototype,xml ,json ,jquery asp.net ajax 原理都一样。＝＝客户端＝＝
var req=null;

      function processReqChange2()
      {
           if(req.readyState==4 && req.status==200)
           {
                 var dtable=document.getElementById('tshow');

                 var nl = req.responseXML.getElementsByTagName( 'book' );
                 for( var i = 0; i < nl.length; i++ )
                 {
                    var nli=nl.item(i);
                      var eauthor=nli.getElementsByTagName('author');
                      var author=eauthor.item(0).firstChild.nodeValue;
                      var etitle=nli.getElementsByTagName('title');
                      var title=etitle.item(0).firstChild.nodeValue;

                      var elTr = dtable.insertRow( -1 );
                      var elAuthorTd = elTr.insertCell( -1 );
                      elAuthorTd.innerHTML = author;
                      var elTitleTd = elTr.insertCell( -1 );
                      elTitleTd.innerHTML = title;
                }
           }
      }
      function processReqChange3()
      {
           if(req.readyState==4 && req.status==200)
           {
              var objdiv=document.getElementById('result');
              var dtable=document.getElementById('tshow');


              var books = eval(req.responseText);
              for(var b in books)
              {
                    var elTr = dtable.insertRow( -1 );                    var elAuthorTd = elTr.insertCell( -1 );
                    elAuthorTd.innerHTML = books[b].author;                    var elTitleTd = elTr.insertCell( -1 );
                    elTitleTd.innerHTML = books[b].title;
              }

           }
      }

      function loadUrl(url,f)
      {
           if(window.XMLHttpRequest)
           {
                try
                {
                   req=new XMLHttpRequest();
                }
                catch(e)
                {
                   req=false;
                }
           }
           else if(window.ActiveXObject)
           {
                try
                {
                    req=new ActiveXObject('Msxml2.XMLHTTP');
                }
                catch(e)
                {
                    try
                    {
                        req=new ActiveXObject('Microsoft.XMLHTTP');
                    }
                    catch(e)
                    {
                        req=false;
                    }
                }
           }

           if(req)
           {
               if(f=='2')
               {
                    req.onreadystatechange=processReqChange2;
               }
               else if(f=='3')
               {
                    req.onreadystatechange=processReqChange3;
               }
               req.open('GET',url,true);
               req.send('');
           }
      }
      function ajaxcallxml()
      {
          var url="ajaxserver.aspx?id=2";
          loadUrl(url,2);
      }
      function ajaxcalljs()
      {
          var url="ajaxserver.aspx?id=3" ;
          loadUrl(url,3);
      }
      function ajaxcallsqlxml()
      {
         var url="ajaxserver.aspx?id=5";
         loadUrl(url,2);
      }
      function ajaxcalljsjson()
      {
          var url="ajaxserver.aspx?id=6" ;
          loadUrl(url,3);
      }
===服务器＝＝＝
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Form["aa"]!= null)
        {
            Response.Write("【中文】欢迎光临:<span style='color:red'>天山寒雪<span>");
            Response.End();
        }
        if (Request.QueryString["id"] != null)
        {
            string s = Request.QueryString["id"].ToString();
            int f = Int32.Parse(Request.QueryString["id"].ToString());
            if (f == 2)
            {  Response.ContentType = "text/xml";
                string xmlstr = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>"+
                    "<中文> " +
                          "<book>"+
                            "<author>天山寒雪QQ'QQ\"MSN“Email</author>"+
                            "<title><![CDATA[757015000<200]]></title>" +
                          "</book>"+
                          "<book>"+
                            "<author><![CDATA[天山寒雪MSN<QQ]]></author>" +
                            "<title>[email protected]>520</title>"+
                          "</book>"+
                          "<book>"+
                           " <author><![CDATA[777<E88]]></author>" +
                           " <title>[email protected]</title>"+
                        "</book>"+
                       "</中文>";
                Response.Write(xmlstr);
            }
            else if (f == 3)
            {
                string jsstr = "["+
                    "{ author: '天山\\'寒雪[1]\"E520', title: '互联网' },"+
                    "{ author: '天山寒雪[2]<E520', title: '软件开发' },"+
                    "{ author: '天山寒雪[3]>E', title: '音乐' }"+
                    "]";
                Response.Write(jsstr);
            }
            else if (f == 4)
            {
                XmlDocument xd = new XmlDocument();
                string xmlstr = "<中文> " +
                          "<book>" +
                            "<one>天山寒雪QQ</one>" +
                            "<two>天山寒雪MSN</two>" +
                          "</book>" +
                       "</中文>";                xd.LoadXml(xmlstr);
                Response.ContentType = "text/xml";
                Response.Write(xd.InnerXml);
            }
            else if (f == 5)
            {
                string connstr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
                string sql = "select b,c from test2";
                Response.ContentType = "text/xml";
                string xmlstr = "<?xml version=\"1.0\" encoding=\"utf-8\" ?><中文>";

                using (SqlDataReader dr = SqlHelper.ExecuteReader(connstr, CommandType.Text, sql))
                {
                    while(dr.Read())
                    {
                        xmlstr += "<book><author>" + dr.GetInt32(0) + "</author><title><![CDATA[" + dr.GetString(1) + "]]></title></book>";
                    }
                }
                xmlstr += "</中文>";
                Response.Write(xmlstr);
            }
            else if (f == 6)
            {
                string connstr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
                string sql = "select b,c from test2";
                string xmlstr = "[";
                using (SqlDataReader dr = SqlHelper.ExecuteReader(connstr, CommandType.Text, sql))
                {
                    while (dr.Read())
                    {
                        xmlstr += "{author:'" + dr.GetInt32(0) + "',title:'" + dr.GetString(1).Replace("'","'")+ "'},";
                    }
                }
                xmlstr =xmlstr.Remove(xmlstr.Length -1);
                xmlstr += "]";
                Response.Write(xmlstr);
            }
            else
            {
                Response.Write("无任何数据...");
            }
            Response.End();
        }
    }
</script>

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谈谈c#中的XML ajax

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