public async void SubscribeAll()
{
var a = (await client.OnJoin()).ResponseStream.ForEachAsync(x => OnJoin(x));
var b = (await client.OnLeave()).ResponseStream.ForEachAsync(x => OnLeave(x));
var c = (await client.OnMessageReceived()).ResponseStream.ForEachAsync(x => OnMessageReceived(x));
// TODO:Client side cancellation.
await Task.WhenAll(a, b, c);
}
static void SubscribeAllListner(IChatRoomStreaming client)
{
client.OnJoin();
client.OnLeave();
client.OnMessageReceived();
}