Page 29 - MSDN Magazine, May 2018

is concerned only when a participant leaves the session. The host will be notified directly by the participant when they join, as you’ll see later in the article. Participants only need to determine the current host account.
The session manager maintains a participant watcher as a private variable that’s initialized in the InitParticipantWatcher.
The last thing the CreateSession method needs added to the class is an event to let consumers know if and when the session is disconnected. The new SessionDisconnected event can be defined as follows:
public event EventHandler<RemoteSystemSessionDisconnectedEventArgs> SessionDisconnected =
delegate { };
Joining a Session
Now that the app is able to broadcast a new remote session, the next thing to implement is the ability to join that session from another machine. There are two steps to joining a remote session: discovery and then connecting to the session.
Discovering a Session An app is able to discover nearby remote sessions through the RemoteSystemSessionWatcher, which is cre- ated from the static CreateWatcher method. This class raises events every time a session is added or removed. Add a new method— DiscoverSessions—to the RemoteSessionManager. This method will create a RemoteSystemSessionWatcher as a private variable to the class and handle the Added and Removed events. These events will be wrapped by two new events added to RemoteSessionManager:
Figure 8 Discovering Sessions
private RemoteSystemSessionWatcher _watcher;
public event EventHandler<RemoteSystemSessionInfo> SessionAdded = delegate { }; public event EventHandler<RemoteSystemSessionInfo> SessionRemoved = delegate { };
public async Task<bool> DiscoverSessions() {
RemoteSystemAccessStatus status = await RemoteSystem.RequestAccessAsync(); if (status != RemoteSystemAccessStatus.Allowed)
{
return false; }
_watcher = RemoteSystemSession.CreateWatcher(); _watcher.Added += (sender, args) =>
{
SessionAdded(sender, args.SessionInfo); };
_watcher.Removed += (sender, args) => {
SessionRemoved(sender, args.SessionInfo); };
_watcher.Start();
return true; }
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