DispatchSource.MemoryPressure 類別

var dispatchSource = new DispatchSource.MemoryPressure (
    MemoryPressureFlags.Critical | MemoryPressureFlags.Warn | MemoryPressureFlags.Normal, 
    DispatchQueue.MainQueue);

dispatchSource.SetRegistrationHandler (() => {
    Console.WriteLine ("Memory monitor registered");
});

dispatchSource.SetEventHandler (() => {
    var pressureLevel = dispatchSource.PressureFlags;
    Console.WriteLine ("Memory worning of level: {0}", pressureLevel);
    dispatchSource.Cancel ();
});

dispatchSource.SetCancelHandler (() => {
    Console.WriteLine ("Memory monitor cancelled");
});

dispatchSource.Resume ();