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   源码介绍

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c# asp.net 多图上传例子源码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Web;
using Plupload.Web.Entity;
using Plupload.Web.Common;


namespace Plupload.Web.Services
{
    /// <summary>
    /// 图片上传类。
    /// </summary>
    public class ServiceUpload : ServiceBase
    {


        /// <summary>
        /// 初始化 <see cref="ServiceUpload"/> 类的新实例。
        /// </summary>
        public ServiceUpload()
        {
            string session_param_name = "ASPSESSID";
            string session_cookie_name = "ASP.NET_SessionId";

            if (HttpContext.Current.Request.Form[session_param_name] != null)
            {
                UpdateCookie(session_cookie_name, HttpContext.Current.Request.Form[session_param_name]);
            }
            else if (HttpContext.Current.Request.QueryString[session_param_name] != null)
            {
                UpdateCookie(session_cookie_name, HttpContext.Current.Request.QueryString[session_param_name]);
            }
        }


        void UpdateCookie(string cookie_name, string cookie_value)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies.Get(cookie_name);
            if (cookie == null)
            {
                cookie = new HttpCookie(cookie_name);
                HttpContext.Current.Request.Cookies.Add(cookie);
            }
            cookie.Value = cookie_value;
            HttpContext.Current.Request.Cookies.Set(cookie);
        }

        #region Methods...

        #region 取得缩略图...

        /// <summary>
        /// 取得缩略图。
        /// </summary>
        public void OutputThumbnail()
        {
            HttpContext context = HttpContext.Current;
            string imageName = context.Request.QueryString["ThumbnailId"] as string;
            if (imageName != null)
            {
                List<ThumbnailInfo> thumbnails = (List<ThumbnailInfo>)context.Session["thumbnails"];
              //  List<ThumbnailInfo> thumbnails = context.Session["thumbnails"] as List<ThumbnailInfo>;
                if (thumbnails != null)
                {
                    foreach (ThumbnailInfo thumbnail in thumbnails)
                    {
                        if (thumbnail.Id == imageName)
                        {
                            context.Response.ContentType = "image/jpeg";
                            context.Response.BinaryWrite(thumbnail.Data);
                            context.Response.End();
                            return;
                        }
                    }
                }

            }
            context.Response.StatusCode = 404;
            context.Response.Write("Not Found");
            context.Response.End();
        }

        #endregion

        #region 上传图片

        /// <summary>
        /// 上传图片
        /// </summary>
        /// <returns></returns>
        public void UploadImage()
        {
            HttpContext context = HttpContext.Current;
            string dirName = DateTime.Now.ToString("yyyyMMdd");
            string uploadPath = Path.Combine(PathConfig.UploadPath, string.Format("{0}/", dirName)); //上传文件的路径
            //string thumbsImagePath = 
            //  string uploadFileUrl = PathConfig.UploadUrl();   //上传文件的URL
            HttpPostedFile uploadFile = context.Request.Files["file"];
            try
            {
                //验证文件夹是否存在
                if (!Directory.Exists(uploadPath))
                {
                    Directory.CreateDirectory(uploadPath);
                }

                string fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff");

                string imagePath = uploadPath   fileName   ".Jpeg";
                Image originalImg = Image.FromStream(uploadFile.InputStream);
                originalImg.Save(imagePath, System.Drawing.Imaging.ImageFormat.Jpeg);

                Image thumbnail = ImageProcess.MakeThumbnail(originalImg, 640, 480, ThumbnailMode.ByWidth);
                string thumbsPath = uploadPath   fileName   "-Thumbs.Jpeg";
                thumbnail.Save(thumbsPath, System.Drawing.Imaging.ImageFormat.Jpeg);

                MemoryStream thumbsStream = ImageProcess.MakeThumbnail(originalImg, 100, 100);
                ThumbnailInfo thumbnailInfo = new ThumbnailInfo(fileName, thumbsStream.GetBuffer());
                thumbsStream.Close();

                List<ThumbnailInfo> thumbnails = (List<ThumbnailInfo>)context.Session["thumbnails"];
                if (thumbnails == null)
                {
                    thumbnails = new List<ThumbnailInfo>();
                    context.Session["thumbnails"] = thumbnails;
                }
                thumbnails.Add(thumbnailInfo);
                context.Session["thumbnails"] = thumbnails;
                context.Response.StatusCode = 200;
                context.Response.Write("[{'name':'"   fileName   "','originalUrl':'"   PathConfig.GetVirtualPath(imagePath)   "','thumbnailUrl':'"   PathConfig.GetVirtualPath(thumbsPath)   "'}]");

            }
            catch
            {
                context.Response.StatusCode = 500;
                context.Response.Write("An error occured");
                context.Response.End();
            }
        }

        #endregion

        #endregion

    }
}