/// <summary>Opens the connection.</summary>
/// <returns>The result.</returns>
private async Task <bool> OpenAsync()
{
try
{
this._client = new SubscriptionServiceClient(new InstanceContext(this));
// state change information (non-essential)
_client.InnerChannel.Opening += async(s, e) => await _guiCallback.ConnectionStateChangedAsync("event", "Connection opening...");
_client.InnerChannel.Opened += async(s, e) => await _guiCallback.ConnectionStateChangedAsync("event", "Connection opened.");
_client.InnerChannel.Closing += async(s, e) => await _guiCallback.ConnectionStateChangedAsync("event", "Connection closing...");
// maintaining the connection!
// Note: These events come for netTcpBinding, but NOT for wsDualHttpBinding!
_client.InnerChannel.Closed += InnerChannel_ClosedAsync;
_client.InnerChannel.Faulted += InnerChannel_FaultedAsync;
_client.Open(); // failure to open will also raise a faulted event!
return(true);
}
catch (Exception ex)
{
await _guiCallback.ServiceCallExceptionAsync("Open", ex);
return(false);
}
}
private async Task <TResult> CallAsync <TResult>(string operation, Func <InformationServiceReference.InformationServiceClient, Task <TResult> > call)
{
// basic error handling
try
{
var client = new InformationServiceReference.InformationServiceClient();
return(await call(client));
}
catch (Exception ex)
{
await _guiCallback.ServiceCallExceptionAsync(operation, ex);
return(default(TResult));
}
}