.Net下载文件后删除临时文件

 FileStream fileStream = new FileStream(zipfilepath, FileMode.OpenOrCreate, FileAccess.Read);
 byte[] buffer = new byte[fileStream.Length];
 fileStream.Read(buffer, 0, buffer.Length);
 Stream stream = new MemoryStream(buffer);
 stream.Seek(0, SeekOrigin.Begin);
 fileStream.Close();
 //释放流
 fileStream.Dispose();
 File.Delete(zipfilepath);