imagehandler.ashx.txt

《圣殿祭司的ASP.NET 2.0开发详解——使用C#》光盘内容.包含了书籍所含的源代码.非常经典的一本asp.net2.0的书籍

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

using System;
using System.Web;
using System.IO;
using System.Configuration;

public class ImageHandler : IHttpHandler 
{
    public void ProcessRequest(HttpContext context)
    {
        //取得员工代号
        string EmployeeID=context.Request.QueryString["EmployeeID"];
        //通过ReadImage类的GetImage()方法取得SQL Server中图片资料
        //其图片存储在MemoryStream之中返回
        MemoryStream ms = new ReadImage().GetImage(EmployeeID);
        if (ms != null)
        {
            //取得图像MemoryStream大小
            int bufferSize = (int)ms.Length;
            //建立 buffer
            byte[] buffer = new byte[bufferSize];
            //调用MemoryStream.Read，自MemoryStream 读取至buffer，并返回count
            int countSize = ms.Read(buffer, 0, bufferSize);
            //返回图像buffer
            context.Response.OutputStream.Write(buffer, 0, countSize);
        }
    }
 
    public bool IsReusable 
    {
        get 
        {
            return false;
        }
    }
}