在ASP.NET中使用WCF上传文件

我已经创建了一个用于上传文件的WCF服务。在使用该服务后，我试图上传文件，我能够成功上传文件，但FILESTREAM类有一些问题。

当我点击按钮上传文件时，我通过调试应用程序检查，我知道流对象是空的。我将流类的对象传递给WCF方法。但是由于某些问题，流对象得到null。由于流类的null对象，上传的图像在我的文件夹

中为空

这是我用来上传文件的代码

 if (FileUpload1.HasFile)
        {
            System.IO.FileInfo fileInfo = new System.IO.FileInfo(FileUpload1.PostedFile.FileName);
            FileTransferServiceReference.ITransferService clientUpload = new FileTransferServiceReference.TransferServiceClient("BasicHttpBinding_ITransferService");
            FileTransferServiceReference.RemoteFileInfo uploadRequestInfo = new RemoteFileInfo();

            string Path = System.IO.Path.GetDirectoryName(FileUpload1.FileName);
            using (System.IO.FileStream stream = new System.IO.FileStream(FileUpload1.FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read))
            {
                uploadRequestInfo.FileName = FileUpload1.FileName;
                uploadRequestInfo.Length = fileInfo.Length;
                uploadRequestInfo.FileByteStream = stream;
                clientUpload.UploadFile(uploadRequestInfo);
            }
        }

WCF服务代码

public RemoteFileInfo DownloadFile(DownloadRequest request)
        {
            RemoteFileInfo result = new RemoteFileInfo();
            try
            {
                // get some info about the input file
                string filePath = System.IO.Path.Combine(@"c:'Uploadfiles", request.FileName);
                System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
                // check if exists
                if (!fileInfo.Exists) throw new System.IO.FileNotFoundException("File not found", request.FileName);
                // open stream
                System.IO.FileStream stream = new System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                // return result
                result.FileName = request.FileName;
                result.Length = fileInfo.Length;
                result.FileByteStream = stream;
            }
            catch (Exception ex)
            {
            }
            return result;
        }

        public void UploadFile(RemoteFileInfo request)
        {
            FileStream targetStream = null;
            Stream sourceStream = request.FileByteStream;

            string uploadFolder = @"C:'upload'";
            if (!Directory.Exists(uploadFolder))
            {
                Directory.CreateDirectory(uploadFolder);
            }
            string filePath = Path.Combine(uploadFolder, request.FileName);
            using (targetStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                const int bufferLen = 65000;
                byte[] buffer = new byte[bufferLen];
                int count = 0;
                while ((count = sourceStream.Read(buffer, 0, bufferLen)) > 0)
                {
                    targetStream.Write(buffer, 0, count);
                }
                targetStream.Close();
                sourceStream.Close();
            }
        }
    }

 string uploadFolder = @"C:'upload'";
 ...
 string filePath = System.IO.Path.Combine(@"c:'Uploadfiles", request.FileName);