Getting prior value on change of property using ReactiveUI in WPF MVVM
How about this:
this.WhenAnyValue(vm => vm.AccountHolderType)
.Buffer(2, 1)
.Select(b => (Previous: b[0], Current: b[1]))
.Subscribe(t => {
//Logic using previous and new value for AccountHolderType
});
I think you have missed this straight forward Buffer function.
Something like:
var previousValue = this.WhenAnyValue(vm => vm.AccountHolderType);
var currentValue = previousValue.Skip(1);
var previousWithCurrent =
previousValue.Zip(currentValue, (prev, curr) => { /* DO SOMETHING HERE */ });