C#异步获取网络资源到Byte数组示例

    class HTTP
    {
        public struct Data
        {
            public HttpStatusCode StatusCode;
            public byte[] Bytes;
        }

        //GET数据
        public int fGetHTTP(String url, out Data data)
        {
            data = new Data();
            if (!fCheckURL(url)) return 1;//错误代码 地址错误
            
            System.GC.Collect();
            Uri tURI = new Uri(url);
            Encoding encode = Encoding.GetEncoding("utf-8");//网页编码==Encoding.UTF8                   
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(tURI);
            req.Method = "GET";
            req.KeepAlive = false;
            req.ReadWriteTimeout = 10000;
            req.Proxy = null;
            req.UserAgent = " Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko";
            req.ContentType = "application/x-www-form-urlencoded";
            req.Accept = "image/png, image/jpg, image/jpeg, image/bmp, image/svg+xml, image/*;q=0.8, */*;q=0.5";
            req.Headers.Add("X-HttpWatch-RID", " 46990-10314");
            req.Headers.Add("Accept-Language", "zh-Hans-CN,zh-Hans;q=0.8,en-US;q=0.5,en;q=0.3");
            HttpWebResponse ress = null;
            Stream sstreamRes = null;
            try