Az egyszeri kötés használata az MVVMCross-ban számos előnyt kínál más kötési módokkal szemben, különösen konkrét forgatókönyvekben:
1. Reduced Overhead: One-Time binding is useful when you need to set a value from the ViewModel to the View only once, without continuously monitoring for changes. Ez csökkenti a kötés fenntartásához kapcsolódó általános költségeket, mivel nem követeli meg a keretnek, hogy hallgassa meg a ViewModel frissítéseit. Ez különösen előnyös a statikus adatok esetében, amelyek nem változnak be, ha beállítják, például a nyelvi fájlok szövege [1] [3].
2. Performance in Recycled Views: While One-Time bindings can be problematic in recycled views like those in `MvxRecyclerView`, they are ideal for scenarios where views are not recycled or where the data is static and doesn't need to be updated dynamically. However, in cases where views are recycled, One-Time bindings may not behave as expected because the views are reused and rebound as they appear on the screen[7].
3. Simplified Binding Infrastructure: Since One-Time bindings only update when the binding context changes, they simplify the binding infrastructure by eliminating the need to monitor source property changes. Ez tisztább kódhoz és kevesebb potenciális problémához vezethet a folyamatos frissítésekhez [4].
4. Appropriate for Read-Only Data: One-Time binding is well-suited for displaying read-only data that is known at initialization time and doesn't change. This includes scenarios like showing static information such as restaurant hours, where the data is set once and doesn't need further updates[3].
5. Consistency with Static Data: In applications where certain data is static and doesn't change frequently, One-Time binding ensures that this data is set correctly without unnecessary updates. Ez fenntartja a felhasználói felület konzisztenciáját a folyamatos monitorozás vége nélkül [1] [3].
In summary, One-Time binding in MvvmCross is beneficial when dealing with static data that doesn't require continuous updates, offering reduced overhead and simplified binding management. Előfordulhat azonban, hogy nem alkalmas dinamikus vagy gyakran változó adatokra, vagy olyan forgatókönyvekben, ahol a nézeteket újrahasznosítják.
Idézetek:[1] https://www.mvvmcross.com/documentation/fundamentals/data-binding
[2] https://stackoverflow.com/questions/41768962/mvvmcross-default-binding-mode-used-in-a-project
[3] https://stackoverflow.com/questions/25460030/when-to-use-mvmcross-data-bindings
[4] https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/data-binding/binding-mode?view=net-maui-9.0
[5] https://www.mvvmcross.com/documentation/advanced/custom-data-binding
[6] https://stackoverflow.com/questions/17156368/
[7] https://stackoverflow.com/questions/48910503/binding-mode-onetime-in-mvxrecyclerview
[8] https://learn.microsoft.com/en-us/archive/msdn-magazine/2014/august/windows-phone-build-mvvm-apps-with-xamarin-and-mvvmcross
[9] https://www.mvvmcross.com/documentation/fundamentals/viewmodel-lifecycle