Question

我一直在尝试设计WCF文件上传服务，但收到以下错误在我的网络应用程序中：

输入'System.Web.HttpInputStream' 无法序列化。考虑标记它与DataContractAttribute 属性，并标记其所有你想用序列化的成员 DataMemberAttribute属性。看到 Microsoft .NET Framework 其他支持的文档类型。

基于此错误，我尝试重新标记我的FileTransfer 带有DataContractAttribute和DataMemberAttribute的类但那没有做任何事情：

[DataContractAttribute(Namespace = "FileTransfer")]
public class FileTransfer
{
    [DataMemberAttribute]
    public string GetUploadStatus;
    [DataMemberAttribute]
    public Tuple<string, int> DoUpload;
    [DataMemberAttribute]
    public int UploadFile;
    [DataMemberAttribute]
    public FileTransferInfo FileInfo;
    [DataMemberAttribute]
    public Stream FileByteStream;
}

我尝试使用服务跟踪查看器访问我的服务跟踪日志看看我是否可以获得有关此错误的更多详细信息。我发现了一些错误以下消息：

带有To的消息 'http://localhost:1242/WebProj/filetransfer.svc/mex/mex' 不能在接收器处理，由于AddressFilter不匹配 EndpointDispatcher。检查一下发送者和接收者 EndpointAddresses同意。

这对我有用，但我也发现了同样的错误：

'http://localhost:1242/WebProj/auth.svc/mex/mex'

在相同的痕迹中，我能够正常验证没有任何错误，这让我想知道这个错误是否是我应该担心的事情（如果有任何机构有关于为什么有mex / mex的建议我的终点，那会很棒）。

那么，为什么'System.Web.HttpInputStream'不能被序列化？我在下面提供了我的代码的其他重要方面。也许有人可以看到我错过的东西？

[DataContract(Namespace = "FileTransfer")]
public class FileTransferInfo
{
    private string _guid;
    private int _flag;
    private long _fileSize;
    private string _fileName;
    private DateTime _lastUpdate;
    private FileTypeEnum _fileType;

    //REMOVED GETTERS AND SETTERS FOR SPACE 

 }

[ServiceContract(Namespace = "FileTransfer")]
public interface IFileTransferService
{
    [OperationContract(Name = "DoUpload")]
    Tuple<string, int> DoUpload(List<FileTransferInfo> request);

    [OperationContract(Action="UploadFile", Name="UploadFile")]
    int UploadFile(FileTransfer request);

}

这是我的UploadFile方法，它返回错误。

int IFileTransferService.UploadFile(FileTransfer request)
{

    string uploadFolder = @"C:\TempMultiFileUploads\";
    int errCode = default(int);
    // parameters validation omitted for clarity
   try 
   {
        string filename = request.FileInfo.FileName;
        string filePath = Path.Combine(uploadFolder, filename);

        using (FileStream outfile = new FileStream(filePath, FileMode.Create))
        {
            const int bufferSize = 65536; // 64K

            Byte[] buffer = new Byte[bufferSize];
            int bytesRead = request.FileByteStream.Read(buffer, 0, bufferSize);

            while (bytesRead > 0)
            {
                outfile.Write(buffer, 0, bytesRead);
                bytesRead = request.FileByteStream.Read(buffer, 0, bufferSize);
            }
        }
    }
    catch (IOException e)
    {
        //System.IOException
        errCode = 800;
    }

   return errCode;

} 
    And, below is the endpoint, binding, and bahavior of my FileTransferService:

<endpoint name="MyFileTransferEP"
          address=""
          binding="basicHttpBinding"
          behaviorConfiguration="BasicHttpEPBehavior"
          bindingConfiguration="httpLargeDataStream"
          contract="FileTransfer.IFileTransferService" />   

<binding name="httpLargeDataStream" 
               closeTimeout="00:01:00" 
               openTimeout="00:01:00"
               receiveTimeout="00:10:00" 
               sendTimeout="00:01:00" 
               maxBufferSize="65536"
               maxReceivedMessageSize="2147483647" 
               messageEncoding="Mtom"
               transferMode="StreamedRequest">        

<behavior name="BasicHttpEPBehavior">
    <dataContractSerializer maxItemsInObjectGraph="2147483646" />
</behavior>

以下是我的Web应用程序中调用上传方法的代码：

FileTransferServiceClient upload = new FileTransferServiceClient();
HttpPostedFile m_objFile = default(HttpPostedFile);
FileTransfer transmit = new FileTransfer();

transmit.FileByteStream = m_objFile.InputStream;
transmit.FileInfo = new FileTransferInfo();
transmit.FileInfo.Guid = Guid.NewGuid().ToString();
transmit.FileInfo.Flag = default(int);
transmit.FileInfo.FileSize = m_objFile.ContentLength;
transmit.FileInfo.FileName = m_objFile.FileName;
transmit.FileInfo.LastUpdate = DateTime.Now;

int retParam = upload.UploadFile(transmit); // THROWS ERROR HERE

感谢您的帮助。

Answer 1

您无法使用Stream成员定义数据协定。您可以将Stream作为单个参数获取或返回，也可以定义具有Stream类型的单个MessageBodyMember但可以具有多个MessageHeader的消息协定。有关WCF中大数据流的更多信息，请参阅this section of MSDN。

类型'System.Web.HttpInputStream'无法序列化

1 个答案: