Flex端利用new PNGEncoder().encode(bitmapData)将png图片转换为ByteArray，然后传给服务器，服务端需要定义一个public ByteArray UploadImage(ByteArray ba)方法

服务器端相关代码

using System;using System.Collections.Generic;using System.Text;using System.IO;using System.Drawing;using System.Web;using FluorineFx;using FluorineFx.AMF3;namespace ServiceLibrary5{    [RemotingService]    public class ByteStreamService    {        public ByteArray UploadImage(ByteArray ba)        {            MemoryStream ms = new MemoryStream(ba.GetBuffer());            Image img = Bitmap.FromStream(ms);            Bitmap newImage = new Bitmap(img);            MemoryStream tempStream = new MemoryStream();            newImage.Save(tempStream, System.Drawing.Imaging.ImageFormat.Png);            string path = HttpContext.Current.Server.MapPath("UpLoad/ByteArray.png");            FileStream fs = new FileStream(path, FileMode.Create);            tempStream.WriteTo(fs);            fs.Close();            ByteArray result = new ByteArray(tempStream);            return result;        }    }}

Flex端相关代码