一 使用背景:
通过Http 请求下载一个压缩的文件到服务器内存中(重点:不用保存到本地),然后通过代码直接提取压缩包的文件
二 实现思路:(注:需要提前安装 ICSharpCode.SharpZipLib.dll)

1 通过Http请求下载压缩文件到服务器的内存中
2 读取内存中压缩的包的流(注意先将:Stream 转换成MemoryStream)
3 通过ICSharpCode.SharpZipLib.Zip.dll的ZipFile方法将压缩包的MemoryStream 注入
4 通过文件索引提取压缩包里的文件流
5 保存上传文件到指定位置
三 参考代码:
public string HttpDownloadFile(int tenantId, RequestHeaadModel heaadModel) { var dfsResultPath = string.Empty; var listDfsPath = new List<string>(); try { #region Http请求参数设置 ServicePointManager.Expect100Continue = false; ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3; ServicePointManager.ServerCertificateValidationCallback += (object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) => true; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(heaadModel.ResquestParamUrl); request.Headers.Add("x-qys-accesstoken", heaadModel.Accesstoken); request.Headers.Add("x-qys-timestamp", "0"); request.Headers.Add("x-qys-signature", heaadModel.Searect); request.ContentType = heaadModel.ContentType; request.Method = "GET"; request.Timeout = 100000; request.Accept = "application/octet-stream"; #endregion #region 对响应的压缩包解析 using (WebResponse webRes = request.GetResponse()) { #region 1 获取响应的压缩包文件流 var length = (long)webRes.ContentLength; var response = webRes as HttpWebResponse; var stream = response.GetResponseStream(); #endregion #region 2 将压缩包文件流程读取到内存中 var stmMemory = new MemoryStream(); if (length == -1) { length = 1024; } var buffer = new byte[length]; int i; while ((i = stream.Read(buffer, 0, buffer.Length)) > 0) { stmMemory.Write(buffer, 0, i); } #endregion #region 3 循环读取压缩包的文件 var zipFile_ = new ICSharpCode.SharpZipLib.Zip.ZipFile(stmMemory); int count = int.Parse(zipFile_.Count.ToString());//获取文件个数 for (int j = 0; j < count; j++) { var tempSteam = zipFile_.GetInputStream(long.Parse($"{i}"));//压缩包里的文件索引 var stmMemory2 = new MemoryStream(); var buffer2 = new byte[zipFile_[i].Size]; int m; //将单个文件的文件流读取到内存中 while ((m = tempSteam.Read(buffer2, 0, buffer2.Length)) > 0) { stmMemory2.Write(buffer2, 0, m); } stmMemory2.Seek(0, SeekOrigin.Begin); var dfsItem = new DfsItem("TenantBaseFile", zipFile_[i].Name, stmMemory2, tenantId); var dfsPath = Dfs.Store(dfsItem); Logger.Debug($"下载背调文件地址:{dfsPath.ToString()}"); listDfsPath.Add(dfsPath.ToString()); stmMemory2.Close(); stmMemory2.Flush(); } #endregion stmMemory.Close(); stmMemory.Flush(); } #endregion } catch (Exception ex) { Logger.Debug($"下载报告异常:异常信息:{ex.Message},堆栈信息:{ex.StackTrace}"); } return string.Join(",", listDfsPath); }