I'm trying to send some data from client to server using streaming functionality in WCF. I can read stream returned from server with no issues. Other way around doesn't work however.
Tried wrapping stream in class decorated with MessageContract with no success.
Client config:
<bindings>
<netTcpBinding>
<binding name="streamingBinding" transferMode="Streamed"
maxReceivedMessageSize="5000000000">
<security mode="None" />
</binding>
</netTcpBinding>
</bindings>
Server config:
<bindings>
<netTcpBinding>
<binding name="streamingBinding" transferMode="Streamed"
maxReceivedMessageSize="5000000000">
<security mode="None" />
</binding>
</netTcpBinding>
</bindings>
...
<service behaviorConfiguration="WcfSvc.WcfServiceBehavior"
name="Shared.StreamingService">
<endpoint address="" binding="netTcpBinding"
bindingConfiguration="streamingBinding"
contract="Shared.IStreamingService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexTcpBinding"
bindingConfiguration=""
contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="net.tcp://localhost:8733/StreamingTest/" />
</baseAddresses>
</host>
</service>
Host app:
private static IStreamingService _service;
private static ServiceHost _serviceHost;
static void Main()
{
_service = new StreamingService();
_serviceHost = new ServiceHost(_service);
_serviceHost.Open();
Console.WriteLine("Press enter to read data");
Console.ReadLine();
var stream = _service.GetData();
var file = File.Create(@"PATH TO NON EXISTING FILE");
stream.CopyTo(file);
file.Close();
Console.WriteLine("Press enter to close host");
Console.ReadLine();
_serviceHost.Close();
}
Client app:
private const string EndpointAddress = "net.tcp://localhost:8733/StreamingTest/";
private const string TcpBindingConfigName = "streamingBinding";
private static WcfChannelFactory<IStreamingService> _factory = new WcfChannelFactory<IStreamingService>();
private static IStreamingService _service;
private static ICommunicationObject _communicationObject;
static void Main()
{
Console.WriteLine("Press enter to connect");
Console.ReadLine();
(_service, _communicationObject) = _factory.OpenAsync(EndpointAddress, TcpBindingConfigName).Result;
var s = File.OpenRead(@"PATH TO EXISTING FILE");
_service.SetData(s);
Console.WriteLine("Press enter to disconnect");
Console.ReadLine();
_communicationObject.Close();
}
Service:
[ServiceContract(SessionMode = SessionMode.NotAllowed)]
public interface IStreamingService
{
[OperationContract]
void SetData(Stream data);
[OperationContract]
Stream GetData();
}
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
public class StreamingService : IStreamingService
{
private Stream _data;
public void SetData(Stream data)
{
_data = data;
}
public Stream GetData()
{
return _data;
}
}
Channel factory implementation:
public class WcfChannelFactory<TService>
{
private ChannelFactory<TService> _channelFactory;
public async Task<(TService, ICommunicationObject)> OpenAsync(string endpointAddress, string tcpBindingConfigName)
{
var tcpBinding = new NetTcpBinding(tcpBindingConfigName);
_channelFactory = new ChannelFactory<TService>(tcpBinding);
await Task.Factory.FromAsync(_channelFactory.BeginOpen, _channelFactory.EndOpen, null);
var wcf = _channelFactory.CreateChannel(new EndpointAddress(endpointAddress));
return (wcf, wcf as ICommunicationObject);
}
public void Close()
{
_channelFactory?.Close();
_channelFactory = null;
}
}
Please fill file names at lines where file streams are created.
After running host and client, pressing enter in client window and then in host window exception is thrown:
System.ObjectDisposedException: Cannot access a closed Stream. (on line 'stream.CopyTo(file);' in host app)
Reverse scenario works just fine (sending file from server to client)
I know what caused my problem. The problem is here:
public Stream GetData()
{
return _data;
}
After returning from GetData method WCF automatically closes the stream. To propagate the stream outside of the service class I had to use an event:
public event Action<StreamMessage> DataSet;
public void SetData(StreamMessage data)
{
_data = data;
DataSet?.Invoke(data);
}
and then consume the stream in the event handler.
I suggest you use the Asynchronous model to build/implement the Service contract, since the file stream is not always synchronized. Please refer to the below code segments.
[ServiceContract]
interface IService
{
[OperationContract]
Task UploadStream(Stream stream);
}
public class MyService : IService
{
public async Task UploadStream(Stream stream)
{
using (stream)
{
using (var file = File.Create(Path.Combine(Guid.NewGuid().ToString() + ".png")))
{
await stream.CopyToAsync(file);
}
}
}
}
Invocation.
ServiceReference1.ServiceClient client = new ServiceReference1.ServiceClient();
string file = Path.Combine(@"C:\", "1.png");
FileStream fs = new FileStream(file,FileMode.OpenOrCreate,FileAccess.ReadWrite,FileShare.ReadWrite);
//var s = File.OpenRead(file);
//MemoryStream ms = new MemoryStream();
//fs.CopyTo(ms);
//ms.Position = 0;
client.UploadStream(fs);
Console.WriteLine("DOne");
Console.ReadLine();
Feel free to let me know if there is anything I can help with.
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