public static Task <string> RequestStringAsync(this IEventProvider cls)
{
var tcs = new TaskCompletionSource <string>();
EventHandler <string> handler = null;
handler = (o, s) =>
{
tcs.SetResult(s);
cls.StringAvailable -= handler;
};
cls.StringAvailable += handler;
cls.RequestString();
return(tcs.Task);
}
