Is using reflection int Unity3d decrease the performance? about ugui-mvvm HOT 3 CLOSED

Yes, it uses reflection. To reduce it, propertyinfos are cached on awake for DataContext and INPCBinding, and there is some additional processing relegated to editor build-time for the CommandBinding. Most of the real cost comes from the use of GetValue and SetValue when properties are changed.

Again, though, this is only when the properties are changed, which also only happens if the classes with those properties implement INotifyPropertyChanged. If they don't, then the properties are only gotten once. SetValue happens whenever the interface changes need to be applied back to the viewmodel.

While slow compared to direct access, it is plenty fast(1200 nano seconds for a getvalue) for a standard user interface, as people are slow when it comes to typing, clicking buttons, etc - things that happen less than once per frame. Do not use it to do something like binding to an object's position that is updated every frame.

You can also see for yourself by running one of the example scenes that the framerate is basically unaffected by the use of the inpcbinding components.

As a last remark: Unity themselves use reflection for the UnityEvents, in the form of invoking delegates.

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commit e63bd8d now also addresses this via giving you the option of generating property accessor functions.

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cool

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