c#图片输出

1：  Response.BinaryWrite() 其实就是和输出文字一样 只是图片是流的形式;

        delegate long myDel(int first, int second);
        FileStream fs;
        byte[] _byte;
        protected void Page_Load(object sender, EventArgs e)
        {
            Response.ContentType = "image/jpeg";
            fs = new FileStream(Server.MapPath("~/file/") + HttpUtility.UrlDecode("你好.jpg"), FileMode.Open);
            _byte = new byte[fs.Length];
            IAsyncResult ir = fs.BeginRead(_byte, 0, (int)fs.Length, null, null);
            fs.Read(_byte, 0, fs.EndRead(ir));
            fs.Close();
            Response.BinaryWrite(_byte);

        }

2：循环

        protected void Button1_Click(object sender, EventArgs e)
        {
            string filePath = Server.MapPath("~/file/") + HttpUtility.UrlDecode("你好.jpg");
            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("你好.jpg", Encoding.UTF8));
            //FileInfo fi = new FileInfo(filePath);
            //Response.WriteFile(fi.FullName);
            //Response.End();


            int length = 0;
            byte[] arr = new byte[1024 * 1024 * 2];
            using (FileStream fs = new FileStream(filePath, FileMode.Open))
            {
                length = fs.Read(arr, 0, arr.Length);
            }
            byte[] arrNew = new byte[length];
            System.Buffer.BlockCopy(arr, 0, arrNew, 0, length);
            Response.BinaryWrite(arrNew);
        }

        public static void ResponseFile(string filePath, HttpContext context, bool hasfileName)
        {
            Stream iStream = null;
            byte[] buffer = new Byte[10000];
            int length;
            long dataToRead;
            context.Response.ContentType = "application/octet-stream";
            context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Path.GetFileName(filePath), Encoding.UTF8));
            using (iStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                dataToRead = iStream.Length;
                while (dataToRead > 0)
                {
                    if (context.Response.IsClientConnected)
                    {
                        length = iStream.Read(buffer, 0, 10000);
                        context.Response.OutputStream.Write(buffer, 0, length);
                        context.Response.Flush();
                        buffer = new Byte[10000];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        dataToRead = -1;
                    }
                }
            }