ashx的使用！！

[powerchuangwai]

求一个示例：

要求：

（1）ashx调用后台类，构造方法供前台调用 ；

（2）前台页面以ajax方式调用ashx获取数据。


谢谢了。

[wuyq11]

var url = "Handler .ashx?Id=" + ID.value;
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = function() {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
var result=xmlHttp.responseText;
var json=eval("("+result+")");
}
}
};
xmlHttp.send(null);
}
}
public class Handler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
...

}

public bool IsReusable
{
get
{
return false;
}
}

}

[powerchuangwai]

谢谢，只是没有看太明白。

[阿非]

http://blog.csdn.net/Sandy945/archive/2009/05/12/4169870.aspx

[dotnet201]

ashx文件属于aspx文件类型的一种。只有后台处理，没有前台界面。是程序员能够专注于后台编程，而不管前台的web。.ashx对应的类继承于IHttpHandler。

如，有这样的这样aspx中有这样一个javascript脚本：
$.ajax({
type: "GET",
url: "AjaxCode/getClientName.ashx",
dataType: "text",
data: "key=" + escape(textInput.value),
cache: false,
success: function(txt) {
//do something
}
});

这个文件是请求的getClientName.ashx。
所以在getClientName.ashx文件中，有相应的操作。
getClientName.ashx 文件中code如下：

<%@ WebHandler Language="C#" Class="getClientName" %>

using System;
using System.Web;

public class getClientName : IHttpHandler
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
if (string.IsNullOrEmpty(context.Request["key"]))
{
context.Response.Write("error");
}
else
{
string key = context.Request["key"].ToString().Trim();
string sql = " select cid,rtrim(clientName) as [name] from clientInfo "
+ " where charindex('" + key + "',rtrim(clientName)) > 0 for xml auto,root('yoolo')";
object json = DBCenter.dbcenter.ExecuteXmlReader(sql);
context.Response.Write(json);
}


context.Response.End();
}

public bool IsReusable
{
get
{
return false;
}
}
}
希望对你有所帮助..

[bestdowt1314]

http://blog.csdn.net/bestdowt1314/archive/2009/08/17/4457298.aspx

jquery+ajax+ashx实现的一个简单ajax 效果

[atmo]

ashx只是没有对应的.aspx文件

[R_zhanche]

http://topic.csdn.net/u/20110114/13/d6d2e274-0b38-437b-8102-def2573c2e3c.html
其实这个和页面生命周期有一定关系

[Jack2013tong]

aspx与ashx的处理机制应该不尽相同，虽然对用户来说效果是一样的，据说象这种应用ashx能获得更好的性能

[powerchuangwai]

个人理解ashx更多的是一种接口。

[jianshao810]

<%@ WebHandler Language="C#" Class="ashx" %>

using System;
using System.Data;
using System.Web;
using System.Text;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using Newtonsoft.Json;
using JqueryGrid;

public class ashx : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.Cache.SetCacheability(HttpCacheability.NoCache);

        if ("" != null) //可以作为权限判断
        {
            int page = 1;
            int rp = 10;
            string sortname = "id";
            string sortorder = "asc";
            string where = "1=1";

            //page params
            if (!string.IsNullOrEmpty(context.Request["page"]))
                page = int.Parse(context.Request["page"].ToString());

            if (!string.IsNullOrEmpty(context.Request["rp"]))
                rp = int.Parse(context.Request["rp"].ToString());

            //sort params
            if (!string.IsNullOrEmpty(context.Request["sortname"]))
                sortname = context.Request["sortname"].ToString();

            if (!string.IsNullOrEmpty(context.Request["sortorder"]))
                sortorder = context.Request["sortorder"].ToString();


            //filter params
            /*
            if (context.Request["id"] != null && context.Request["id"].ToString() != "")
                where += " and id='" + context.Request["id"].ToString() + "'";

            if (context.Request["title"] != null && context.Request["title"].ToString() != "")
                where += " and title='" + context.Request["title"].ToString() + "'";

            if (context.Request["keyword"] != null && context.Request["keyword"].ToString() != "")
                where += " and keyword='" + context.Request["keyword"].ToString() + "'";

            if (context.Request["url"] != null && context.Request["url"].ToString() != "")
                where += " and url='" + context.Request["url"].ToString() + "'";

            if (context.Request["description"] != null && context.Request["description"].ToString() != "")
                where += " and description='" + context.Request["description"].ToString() + "'";
                */
            DBHelper dbhelper = new DBHelper();
            string sql = "select * from links";
            DataSet ds = dbhelper.GetDataSet(sql);

            if (ds.Tables[0].Rows.Count > 0)
            {

                string sort = " " + sortname + " " + sortorder; //排序表达式
                DataRow[] rowArray = ds.Tables[0].Select(where, sort);
                if (rowArray.Length != 0)
                {
                    int pages = (rowArray.Length % rp != 0) ? (rowArray.Length / rp + 1) : (rowArray.Length / rp);
                    string[] jsonArr = new string[pages];

                    for (int i = 1; i <= pages; i++)
                    {
                        StringBuilder sb = new StringBuilder();
                        sb.Append("{\n");
                        sb.Append("page: " + i.ToString() + ",\n");
                        sb.Append("pages: " + pages + ",\n");
                        sb.Append("total: " + rowArray.Length + ",\n");
                        sb.Append("rows: [");

                        bool rc = false;
                        for (int j = (i - 1) * rp; j < i * rp; j++)
                        {
                            if (j < rowArray.Length)
                            {
                                DataRow dr = rowArray[j];
                                if (rc)
                                    sb.Append(",");
                                sb.Append("\n{");
                                sb.Append("id:'" + dr["id"].ToString() + "',");
                                sb.Append("cell:['" + dr["id"].ToString() + "'");
                                sb.Append(",'" + dr["title"].ToString() + "'");
                                sb.Append(",'" + dr["keyword"].ToString() + "'");

                                if (dr["id"].ToString() != "")
                                    sb.Append(",'" + dr["url"].ToString() + "'");
                                else
                                    sb.Append(",' '");

                                sb.Append(",'" + dr["description"].ToString() + "']");

                                sb.Append("}");
                                rc = true;
                            }
                            else
                                break;

                        }

                        sb.Append("],\n");

                      sb.Append(BuildParams(ds));

                        sb.Append("}");

                        jsonArr[i - 1] = sb.ToString();

                    }
                    context.Response.ContentType = "text/plain";
                    context.Response.Write(JsonConvert.DeserializeObject(jsonArr[page - 1])); //格式化成JSON数据输出
                }
                else
                {
                    StringBuilder sb1 = new StringBuilder();
                    sb1.Append("{\n page:1,\ntotal:0,\npages:1,rows:'',");
                  sb1.Append(BuildParams(ds));
                    sb1.Append("}");

                    context.Response.ContentType = "text/plain";
                    context.Response.Write(JsonConvert.DeserializeObject(sb1.ToString()));
                }
            }
            else
            {
                context.Response.ContentType = "text/plain";
                context.Response.Write(JsonConvert.DeserializeObject("{\n page:1,\ntotal:0,pages:1,rows:'',cols:''}"));
            }
        }
        else
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write("-1"); //输出-1,向JQUERY插件提示用户没有权限
        }
    }
    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

    /// <summary>
    /// 绑定抬头行和过滤行数据
    /// </summary>
    /// <param name="ds"></param>
    /// <returns></returns>
    private string BuildParams(DataSet ds)
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("cols: [\n");

        sb.Append("{display:'ID',name:'id',className:'IDDiv',sortable:true},\n");
        sb.Append("{display:'Title',name:'title',className:'titleDiv',sortable:true},\n");
        sb.Append("{display:'Keywords',name:'keyword',className:'kewordDiv',sortable:true},\n");
        sb.Append("{display:'Url',name:'url',className:'urlDiv',sortable:true},\n");
        sb.Append("{display:'Description',name:'description',className:'descriptionDiv',sortable:true},\n");
        sb.Append("],\n");

        sb.Append("id:[");
        sb.Append(Filter.SelectDistinct(ds.Tables[0], "id"));
        sb.Append("],\n");

        sb.Append("title:[");
       // sb.Append(Filter.SelectDistinct(ds.Tables[0], "title"));
        sb.Append("],\n");

        sb.Append("keyword:[");
        //sb.Append(Filter.SelectDistinct(ds.Tables[0], "keyword"));
        sb.Append("],\n");

        sb.Append("url:[");
       // sb.Append(Filter.SelectDistinct(ds.Tables[0], "url"));
        sb.Append("],\n");

        sb.Append("description:[");
       // sb.Append(Filter.SelectDistinct(ds.Tables[0], "description"));
        sb.Append("]\n");

        return sb.ToString();
    }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="TestPage_Default" %>

<!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 runat="server">
    <title></title>

    <style type="text/css">
        body
        {
            font-size: 12px;
            font-family: Arial;
        }
    </style>
    <link href="../Styles/jqGrid/jquery.css" rel="stylesheet" type="text/css" />
    <script src="../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script src="../Scripts/AxioGrid.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {
        $("#jqueryData").AxioGrid({
                method:"Get",
                url: "/Ashx/ashx.ashx",
                itembuttons: [{ name: "Edit", displayname: "Edit", className: "editButton", bthclass: "bthclass", bthname: "Edit", onclick: editItems }, { name: "Delete", displayname: "Del", className: "deleteButton", bthclass: "bthclass", bthname: "Delete", onclick: editItems}],
                rp: 10//,
                //filterable: true,
                //filter: [{ name: "id", value: "" }, { name: "title", value: "" }, { name: "keyword", value: "" }, { name: "url", value: "" }, { name: "description", value: ""}]
            });

        });

        function editItems(com, id, p) {
        debugger
            if (com == "Edit") {
                alert(id);
            }
            if (com == "Delete") {
                var r = confirm("Would you delete the user of the user code is \"" + id + "\"");
                if (r) {

                }
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div id="jqueryData"></div>
    </form>
</body>
</html>

[以专业开发人员为伍]

[Quote=引用 4 楼 dotnet201 的回复:]
ashx文件属于aspx文件类型的一种。只有后台处理，没有前台界面。
[/Quote]

不论是aspx还是ashx，在向浏览器端输出html时是完全一样的，不存在ashx就不输出正规html的说法。