WebService代碼：

///
    /// 上傳文件
    ///
    /// 文件的byte[]
    /// 上傳文件的路徑
    /// 上傳文件名字
    ///
    [WebMethod]
    public bool UploadFile(byte[] fs, string path, string fileName)
    {
        bool flag = false;
        try
        {
            //獲取上傳案例圖片路徑
            path = Server.MapPath(path);
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            //定義并實(shí)例化一個(gè)內(nèi)存流，以存放提交上來的字節(jié)數(shù)組。
            MemoryStream m = new MemoryStream(fs);
            //定義實(shí)際文件對象，保存上載的文件。
            FileStream f = new FileStream(path + "\" + fileName, FileMode.Create);
            //把內(nèi)內(nèi)存里的數(shù)據(jù)寫入物理文件
            m.WriteTo(f);
            m.Close();
            f.Close();
            f = null;
            m = null;
            flag = true;
        }
        catch (Exception ex)
        {
            flag = false;
        }
        return flag;
    }

    [WebMethod(Description = "下載服務(wù)器站點(diǎn)文件，傳遞文件相對路徑")]
    public byte[] DownloadFile(string strFilePath, string path)
    {
        FileStream fs = null;
        string CurrentUploadFolderPath = HttpContext.Current.Server.MapPath(path);

        string CurrentUploadFilePath = CurrentUploadFolderPath + "\" + strFilePath;
        if (File.Exists(CurrentUploadFilePath))
        {
            try
            {
                ///打開現(xiàn)有文件以進(jìn)行讀取。
                fs = File.OpenRead(CurrentUploadFilePath);
                int b1;
                System.IO.MemoryStream tempStream = new System.IO.MemoryStream();
                while ((b1 = fs.ReadByte()) != -1)
                {
                    tempStream.WriteByte(((byte)b1));
                }
                return tempStream.ToArray();
            }
            catch (Exception ex)
            {
                return new byte[0];
            }
            finally
            {
                fs.Close();
            }
        }
        else
        {
            return new byte[0];
        }

客戶端代碼：

 ///
        /// 上傳圖片附件
        ///
        ///
        private bool UploadImage()
        {
            bool flag = true;
            string path = @"C:\Documents and Settings\Administrator\My Documents\My Pictures\10121312156cf4a761c504fe69.jpg";//本地路徑
            byte[] bytes = GetBytesByPath(path);//獲取文件byte[]
            string uploadPath = "image";//上傳服務(wù)器文件夾路徑
            string fileName = "img18.jpg";//文件名稱
            try
            {
                localhost.Service s = new WindowsFormsApplication1.localhost.Service();
                if (s.UploadFile(bytes, uploadPath, fileName)) { flag = true; }
                else { flag = false; }
            }
            catch
            {
                flag = false;
            }
            return flag;
        }
        ///
        /// 根據(jù)文件的路徑獲取圖片的byte[]
        ///
        ///
        ///
        public static byte[] GetBytesByPath(string path)
        {
            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            BinaryReader br = new BinaryReader(fs);
            byte[] bytes = br.ReadBytes((int)fs.Length);
            fs.Flush();
            fs.Close();
            return bytes;
        }

        private void DownFile()
        {
            localhost.Service s = new WindowsFormsApplication1.localhost.Service();
            byte[] bs = s.DownloadFile("img18.jpg","image");
            FileStream stream=new FileStream(@"C:\Documents and Settings\Administrator\My Documents\My Pictures\18.jpg", FileMode.CreateNew);
            stream.Write(bs,0,bs.Length);
            stream.Flush();
            stream.Close();
        }