在ASP.NET中使用WCF上传文件

Question

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();
            }
        }
    }

Answer 1

区别:

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

作为一般提示，您可以将上传文件路径放入外部配置文件中，以便在将应用程序移动到需要将数据存储在不同驱动器或特定位置的服务器时更改它。

同样，你总是调用相同的配置项，所以你的上传路径名肯定会在任何地方都是相同的