C#利用WebService接口下载文件

            WebTest.RtTfSimDataInterface test = new WebTest.RtTfSimDataInterface();
            //string strBasic = test.GetTfBasicDataInfo("admin", "123", "11", true);
            string strRealTime = test.GetTfRealTimeDataInfo("admin", "11", "11", true);
            //string strjson = HttpUtility.UrlDecode(HttpUtility.UrlEncode(str));

            WebTest.xsdDwgInfo dd = test.GetTfDwgBinaryInfo("admin", "admin", "1", 0);

            /////////////////////////////////////////////////////////////////////////////
            int nReadSize = dd.mnReadSize;//读取文件大小
            sbyte[] mySByte = new sbyte[nReadSize];
            mySByte = dd.mpBuffer;
            bool bEof = dd.mbEof;
            string strFileName = dd.mstrFileName;//文件名称
            string strDwg_UpdateTime = dd.mstrDwgUpdateTime;//文件最后更新时间
            //写数据

            byte[] arr = new byte[nReadSize];
            Buffer.BlockCopy(mySByte, 0, arr, 0, nReadSize);//sbyte[]转byte[]

            if (!File.Exists("E:\a.dwg"))
            {
                FileStream FsCreate = new FileStream("E:\a.dwg", FileMode.Create);
                FsCreate.Close();
            }
            FileStream fs = new FileStream("E:\a.dwg", FileMode.Append, FileAccess.Write);
            fs.Write(arr, 0, nReadSize);//写入byte[]
            fs.Close();

            int nPosition = dd.mnReadSize;//读取文件位置

            while (!bEof)//文件未下载完成，继续下载
            {
                dd = test.GetTfDwgBinaryInfo("admin", "admin", "1", nPosition);
                nPosition += dd.mnReadSize;
                bEof = dd.mbEof;
                nReadSize = dd.mnReadSize;
                sbyte[] sbyteTmp = new sbyte[nReadSize];
                sbyteTmp = dd.mpBuffer;

                byte[] arrTmp = new byte[sbyteTmp.Length];
                Buffer.BlockCopy(sbyteTmp, 0, arrTmp, 0, sbyteTmp.Length);

                if (!File.Exists("E:\a.dwg"))
                {
                    FileStream FsCreate = new FileStream("E:\a.dwg", FileMode.Create);
                    FsCreate.Close();
                } FileStream fsTmp = new FileStream("E:\a.dwg", FileMode.Append, FileAccess.Write);
                fsTmp.Write(arrTmp, 0, nReadSize);
                fsTmp.Close();
            }