wpf webclient下载http图片资源问题怎么解决

在wpf使用webclient的downloadfile，下载完之后打开之后显示图片格式不对，没有显示图片就很奇怪。望能解决。

已解决

代码贴出来看看

 try
            {
                if (!string.IsNullOrEmpty(url))
                {
                    address = YBHelper.YBUtileTool.getAppPath(@"\LayOutData\") + url.Substring(url.LastIndexOf("/") + 1);
                    if (!File.Exists(address))
                    {  
                        webClient.DownloadFile(url, address);//就是用这个下载资源的
                    }
                    PlaySouce.Add(address);
                    if (File.Exists(address)) return true;

                }
            }
            catch(Exception ex)
            {
                log.WriteLog(ex.Message,Log.LogType.NetWork,ex.StackTrace);
            }
            return false;

/// <summary>
        /// 下载资源文件
        /// </summary>
        /// <param name="url">网络地址</param>
        /// <param name="address">下载到本地的地址</param>
        /// <returns></returns>
        public static bool DownLoadFile(string url,string address)
        {

            try
            {
                if (!string.IsNullOrEmpty(url))
                {
                    if (!File.Exists(address))
                    {
                        //webClient.Headers.Add("Accept-Encoding", "gzip,deflate");
                        byte[] byteArr = webClient.DownloadData(url);
                        string contentEncoding = webClient.ResponseHeaders["Content-Encoding"];
                        if (contentEncoding == "gzip")
                        {
                            Stream stream = new MemoryStream(byteArr);
                            using (Stream zipStream = new GZipStream(stream, CompressionMode.Decompress))
                            {
                                using (Stream fileStream = new FileStream(address, FileMode.Create))
                                {
                                    byte[] read = new byte[1024];
                                    int readlen = zipStream.Read(read, 0, read.Length);
                                    while (readlen > 0)
                                    {
                                        fileStream.Write(read, 0, read.Length);
                                        readlen = zipStream.Read(read, 0, read.Length);
                                    }
                                    stream.Close();
                                    fileStream.Close();
                                    zipStream.Close();
                                }

                            }
                        }
                        else
                        {
                            Stream stream = new MemoryStream(byteArr);
                                using (Stream fileStream = new FileStream(address,FileMode.Create))
                                {
                                    byte[] read = new byte[1024];
                                    int readlen = stream.Read(read, 0, read.Length);
                                    while (readlen > 0)
                                    {
                                        fileStream.Write(read, 0, read.Length);
                                        readlen = stream.Read(read, 0, read.Length);
                                    }
                                    stream.Close();
                                    fileStream.Close();
                                }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                log.WriteLog(ex.Message, Log.LogType.NetWork, ex.StackTrace);
            }
            return false;
        }
就是判断是否压缩文件了，然后解压，可以改改。