学步园

　　最近项目中用到了照片展示，开始做的是直接排列显示原图，无奈图片多了就卡的不行了，尤其Chrome，滚动条都动不了，只能改动了。。

　　代码保存在这里，算是备忘，比较简单，就不加说明了。

　缩略图　

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

using System;
using System.Web;
using Drision.Framework.Entity;
using System.IO;
using System.Drawing;
using Drision.Framework.Repository.EF;
using Drision.Framework.Web;
using Drision.Framework.Repository;
public class ShowThumbnail : IHttpHandler {

    public void ProcessRequest(HttpContext context)
    {
        int id = Convert.ToInt32(context.Request.QueryString["id"]);
        if (id != null)
        {
            using (DrisionDbContext cont = new DrisionDbContext(GlobalObject.ConnString))
            {
                Repository<T_Attachment> rep = new Repository<T_Attachment>(cont);
                T_Attachment Attachment = rep.FindById(id);
                byte[] AttachData = Attachment.FileData;
                OutPutThumbnail(AttachData, context);
            }
        }
        //context.Response.ContentType = "text/plain";
        //context.Response.Write("Hello World");
    }
    //输出缩略图
    public void OutPutThumbnail(byte[] AttachData,HttpContext context)
    {
        try
        {
            //写入内存流
            using (MemoryStream stream = new MemoryStream(AttachData))
            {
                using (Bitmap bm = new Bitmap(stream))
                {
                    //Bitmap bm = null;
                    Image image = null;
                    //bm = new Bitmap(stream);
                    int width = 100;
                    int height = (int)(width * ((double)bm.Height / (double)bm.Width));
                    //　getthumbnailimage生成缩略图　
                    image = bm.GetThumbnailImage(width, height, null, IntPtr.Zero);
                    context.Response.ContentType = "image/jpeg";
                    image.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                    image.Dispose();
                }
            }
        }
        catch (Exception ex)
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write(ex.Message);
        }
    }
    public bool IsReusable {
        get {
            return false;
        }
    }
}

   原图

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

using System;
using System.Web;
using Drision.Framework.Entity;
using System.IO;
using System.Drawing;
using Drision.Framework.Repository.EF;
using Drision.Framework.Web;
using Drision.Framework.Repository;
public class ShowSourceImage : IHttpHandler {

    public void ProcessRequest(HttpContext context)
    {
        int id = Convert.ToInt32(context.Request.QueryString["id"]);
        if (id != null)
        {
            using (DrisionDbContext cont = new DrisionDbContext(GlobalObject.ConnString))
            {
                Repository<T_Attachment> rep = new Repository<T_Attachment>(cont);
                T_Attachment Attachment = rep.FindById(id);
                byte[] AttachData = Attachment.FileData;
                //OutPutThumbnail(AttachData, context);
                //context.Response.ContentType = "text/plain";
                //context.Response.Write("Hello World");
                context.Response.ContentType = "image/jpeg";
                context.Response.BinaryWrite(AttachData);
            }
        }
    }
    /// <summary>
    /// 输出缩略图
    /// </summary>
    /// <param name="AttachData">二进制数组</param>
    /// <param name="context">HttpContext context</param>
    public void OutPutThumbnail(byte[] AttachData, HttpContext context)
    {
        try
        {
            //写入内存流
            using (MemoryStream stream = new MemoryStream(AttachData))
            {
                using (Bitmap bm = new Bitmap(stream))
                {
                    //Bitmap bm = null;
                    Image image = null;
                    //bm = new Bitmap(stream);
                    int width = 100;
                    int height = (int)(width * ((double)bm.Height / (double)bm.Width));
                    //　getthumbnailimage生成缩略图　
                    image = bm.GetThumbnailImage(width, height, null, IntPtr.Zero);
                    context.Response.ContentType = "image/jpeg";
                    image.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                    image.Dispose();
                }
            }
        }
        catch (Exception ex)
        {
            context.Response.ContentType = "text/plain";
            context.Response.Write(ex.Message);
        }
    }
    public bool IsReusable {
        get {
            return false;
        }
    }
}