利用ashx實現AJAX的非同步資料調用

最後更新：2018-12-04 來源：互聯網

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ashx檔案，.net一般處理常式。繼承IHttpHandler介面，HttpContext實現個別HTTP請求。

實現：利用本地SQL2000預設的 northwind 資料庫

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

using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Text;

public class Handler : IHttpHandler {

    public void ProcessRequest (HttpContext context)
    {

/*---------------------------自訂代碼----------------------------*/
string str = @"server = .;uid =sa;password = sa;database = northwind";

//取資料庫中的表

        SqlConnection Con = new SqlConnection(str);
        DataSet ds = new DataSet();
        SqlDataAdapter sda = new SqlDataAdapter();
        sda.SelectCommand = new SqlCommand("select * from Employees", Con);
        Con.Open();
        sda.Fill(ds);
        Con.Close();
        //將表填充到DataTable
        DataTable dt = ds.Tables[0];

        // 構造輸出資料流格式
        StringBuilder strPart = new StringBuilder();
        strPart.Append("<table>");
        for (int i = 0; i < 5; i++)
        {
            strPart.AppendFormat("<tr><td><a href ='Default.aspx?id={0}'>{1}</a></td></tr>", dt.Rows[i]["EmployeeID"],dt.Rows[i]["LastName"]);
        }
        strPart.Append("</table>");
        string s = strPart.ToString();

        //根據ＨＴＴＰ局部請求返迴流到頁面
        context.Response.Write(s);


    }

    public bool IsReusable
    {
        get {
            return false;
        }
    }

}

運行下這個ＡＳＨＸ檔案將地址複製下來

在靜態頁面調用這個ＡＳＨＸ檔案

<!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>無標題頁</title>

</head>
<body onload ="list('http://localhost:14379/WebHtmlPartDynamic/Handler.ashx','divList')">
    <div id="divList">
    </div>

    <div id ="divtest">
        <input id="Button1" type="button" value="button" onclick ="list('http://localhost:14379/WebHtmlPartDynamic/Handler.ashx','divtest')"/>
    </div>

</body>
</html>

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