I expect to see "True" text when checkbox is checked or "False" text when it's unchecked. That's not true fortwo clicks after suppression.

Put 3 breakpoints: one in value setter (V), one in text setter (T), one in subscribe (S).

1. Click checkbox - VST
2. Click checkbox - VST
3. ClickTest button - V
4. Click checkbox - V
5. Click checkbox - V
6. Click checkbox - VST

Why 4 and 5 step are so strange?

Yes, same. VS prompts me withIDE0063.

Okay, I will take a look at this later when I finish work.

Okay, the binding is a bool, WhenAnyValue gives change notifications so therefore this is the way it currently operates:

using this code

public MainViewModel(){    var count = 0;    this.WhenAnyValue(o => o.Value).Subscribe(value => Text = value.ToString() + count++);    Test = ReactiveCommand.Create(() =>    {        using var dispose = SuppressChangeNotifications();        Value = true;        count = 0;    });}

Scenario 1 - Suppression When FALSE with a suppressed TRUE change

Unchecked => changes falseChecked => changes trueUnchecked => changes falseSuppressChangeNotifications{Set Value true => no change as suppressedDispose Suppression}Checked => no change due to equal to suppressed valueUnchecked => no change as equal to last changeChecked => changes true

Scenario 2 - Suppression When TRUE with a suppressed TRUE change

Unchecked => changes falseChecked => changes trueSuppressChangeNotifications{Set Value true => no change as suppressedDispose Suppression}Unchecked => changes false as not equal to last changeChecked => changes true

using this code

public MainViewModel(){    var count = 0;    this.WhenAnyValue(o => o.Value).Subscribe(value => Text = value.ToString() + count++);    Test = ReactiveCommand.Create(() =>    {        using var dispose = SuppressChangeNotifications();        Value = false;        count = 0;    });}

Scenario 3 - Suppression When FALSE with a suppressed FALSE change

Unchecked => changes falseChecked => changes trueUnchecked => changes falseSuppressChangeNotifications{Set Value false=> no change as suppressedDispose Suppression}Checked => changes trueUnchecked => changes false

Scenario 4 - Suppression When TRUE with a suppressed FALSE change

Unchecked => changes falseChecked => changes trueSuppressChangeNotifications{Set Value false=> no change as suppressedDispose Suppression}Unchecked => no change due to equal to suppressed valueChecked => no change as equal to last changeUnchecked => changes false

Hmm.. "no change as equal to last change" happens because the change while suppressed will cause same value to be ignored and not remembered as "last change". That make sense, thanks.

Is it possible to update that "last changed" value while suppressing? My intent is to update value without triggering anyWhenAnyValue().Subscribe(), but any change after suppression should work without problems! I am willing to add some logic where I suppress change, but I'd like to keep subscribers code clean.

As I said earlier, I don't want to introducebool flag to be checked by every subscriber, whenever they need to ignore change made while flag is set:

this.WhenAnyValue(o=>o.Value).Subscribe(value=>{if(!IgnoreValue)// suppressed changes are ignored by subscriberText=value.ToString();});Test=ReactiveCommand.Create(()=>{IgnoreValue=true;// suppress changes by setting flagValue=true;IgnoreValue=false;});

I've refactored the code with bool flag and it looks not so bad:

publicclassMainViewModel:ReactiveObject,ISuspendable{[Reactive]publicstring?Text{get;set;}[Reactive]publicboolValue{get;set;}publicReactiveCommand<Unit,Unit>Test{get;}boolISuspendable.IsSuspended{get;set;}publicMainViewModel(){this.WhenAnyValue(o=>o.Value).Subscribe(this, value=>Text=value.ToString());Test=ReactiveCommand.Create(()=>{usingvardispose=this.Suspend();Value=true;});}}publicinterfaceISuspendable{boolIsSuspended{get;set;}}publicsealedclassSuspendableDisposeHelper:IDisposable{readonlyISuspendablesuspendable;publicSuspendableDisposeHelper(ISuspendablesuspendable){this.suspendable=suspendable;suspendable.IsSuspended=true;}publicvoidDispose()=>suspendable.IsSuspended=false;}publicstaticclassSuspendableExtensions{publicstaticIDisposableSuspend(thisISuspendablesuspendable)=>newSuspendableDisposeHelper(suspendable);publicstaticIDisposableSubscribe<T>(thisIObservable<T>source,ISuspendablesuspendable,Action<T>onNext)=>source.Subscribe(o=>{if(!suspendable.IsSuspended)onNext(o);});}

There is one more parameter to pass intoSubscribe method, but otherwise the code looks similar to one withSuppressChangeNotifications.