// 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);
}
}
}
}
}
