// A specific client identified by connection ID.
public async Task Client(string userId, string message)
{
var name = Context.User.Identity.Name;
using (var db = new UserContext())
{
var user = db.Users.Find(userId);
if (user == null)
{
await Clients.Caller.showErrorMessage("Could not find that user.");
}
else
{
db.Entry(user)
.Collection(u => u.Connections)
.Query()
.Where(c => c.Connected == true)
.Load();
if (user.Connections == null)
{
await Clients.Caller.showErrorMessage("The user is no longer connected.");
}
else
{
foreach (var connection in user.Connections)
{
await Clients.Client(connection.ConnectionId)
.addChatMessage(name + ": " + message);
}
}
}
}
}
//
// OVERRIDES
public override Task OnConnected()
{
// Add your own code here.
// For example: in a chat application, record the association between
// the current connection ID and user name, and mark the user as online.
// After the code in this method completes, the client is informed that
// the connection is established; for example, in a JavaScript client,
// the start().done callback is executed.
var version = Context.QueryString["version"];
if (version != "1.0")
{
Clients.Caller.notifyWrongVersion();
}
var name = Context.User.Identity.Name;
// create
using (var db = new UserContext())
{
var user = db.Users
.Include(u => u.Connections)
.SingleOrDefault(u => u.UserName == name);
if (user == null)
{
user = new User
{
UserName = name,
Connections = new List<Connection>()
};
db.Users.Add(user);
}
user.Connections.Add(new Connection
{
ConnectionId = Context.ConnectionId,
UserAgent = Context.Request.Headers["User-Agent"],
Connected = true
});
db.SaveChanges();
}
Connections.Add(name, Context.ConnectionId);
return base.OnConnected();
}
public override Task OnDisconnected()
{
var name = Context.User.Identity.Name;
using (var db = new UserContext())
{
var connection = db.Connections.Find(Context.ConnectionId);
connection.Connected = false;
db.SaveChanges();
}
Connections.Remove(name, Context.ConnectionId);
return base.OnDisconnected();
}