JW/EMIS.Web/Controls/Handler/ImageReader.ashx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing.Imaging;
using System.Reflection;
using EMIS.Utility;

namespace EMIS.Web.Controls.Handler
{
    /// <summary>
    /// ImageReader 的摘要说明
    /// </summary>
    public class ImageReader : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            var image = RSI.Get(context.Request["key"]);

            context.Response.Buffer = true;
            context.Response.ExpiresAbsolute = System.DateTime.Now.AddSeconds(-1);
            context.Response.Expires = 0;
            context.Response.CacheControl = "no-cache";
            context.Response.AppendHeader("Pragma", "No-Cache");
            image.Save(context.Response.OutputStream, image.RawFormat);
            Type imageFormatType = typeof(ImageFormat);
            System.Reflection.PropertyInfo[] _ImageFormatList = imageFormatType.GetProperties(BindingFlags.Static | BindingFlags.Public);
            for (int i = 0; i != _ImageFormatList.Length; i++)
            {
                ImageFormat _FormatClass = (ImageFormat)_ImageFormatList[i].GetValue(null, null);
                if (_FormatClass.Guid.Equals(image.RawFormat.Guid))
                {
                    context.Response.ContentType = "image/" + _ImageFormatList[i].Name.ToLower();
                }
            }
            context.Response.End();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}