/// <summary>
/// no binding required and CanExecute not called
/// </summary>
internal object ExecuteSafe(ClientInstance <MT, T> clientEx, object par)
{
if (_client == null)
{
_client = clientEx;
}
else if (clientEx != null && clientEx != _client)
{
throw new ApplicationException("Wrong _client parameter");
}
try
{
Debug.Print("{2}: {1} started at {0}", DateTime.Now, GetType().Name, _client.ApplicationID);
// if server was stopped till here there will be exception
return(ExecuteCommand(par));
}
catch (FaultException ex)
{
ClientCommandState = ClientCommandState.Fault;
// thrown inside of server
// channels are NOT distroyed
if (!_calledFromCode)
{
Show(ex.Message);
}
return(ex.Message);
}
catch (PermissionException ex)
{
if (!_calledFromCode)
{
Show(ex.Message);
}
return(ex.Message);
}
catch (ApplicationException ex)
{
// thrown on _client inside of ExecuteCommand
_client.LastError = ex.Message;
if (!_calledFromCode)
{
Show(ex.Message);
}
return(ex.Message);
}
//like EndpointNotFoundException
// or CommunicationObjectFaultedException(thrown if _client requests killed server)
catch (CommunicationException ex)
{
ClientCommandState = ClientCommandState.Fault;
// channels are distroyed
_client.CreateFactories();
Show("Server is not started", ex.GetType().Name);
return(ex.Message);
}
catch (ThreadAbortException)
{
return(null);
}
catch (Exception ex)
{
ClientCommandState = ClientCommandState.Fault;
// channels are distroyed, but server has adequate state.
// _client may reconnect automatically or wait for user reaction
// _client.CreateFactories(); does not help
Show(ex.Message, ex.GetType().Name);
return(null);
}
finally
{
Debug.Print("{2}: {0} finished at {1}", GetType().Name, DateTime.Now, _client.ApplicationID);
// here additional session may be closed
}
}