Raisepropertychanged WPF yog dab tsi?
Raisepropertychanged WPF yog dab tsi?

Video: Raisepropertychanged WPF yog dab tsi?

Video: Raisepropertychanged WPF yog dab tsi?
Video: MVVM nativo en Xamarin.Forms 2024, Kaum ib hlis
Anonim

2. 9. PropertyChanged yog siv los ceeb toom rau UI tias qee yam tau hloov pauv hauv Tus Qauv. Txij li thaum koj tab tom hloov cov cuab yeej sab hauv ntawm Tus Neeg Siv Khoom - Tus Neeg Siv Khoom nws tus kheej tsis hloov pauv thiab yog li ntawd PropertyChanged kev tshwm sim tsis tau tsa.

Kuj nug, kev siv INotifyPropertyChanged hauv WPF yog dab tsi?

INotifyPropertyChanged interface yog siv ceeb toom rau qhov pom lossis ViewModel tias nws tsis muaj teeb meem dab tsi yog khi; nws yog tshiab. Cia peb ua piv txwv rau kev nkag siab qhov interface no. Noj ib qho WPF Qhov rai uas muaj tag nrho peb qhov chaw: Thawj Lub Npe, Lub Xeem thiab Lub Npe.

Tom qab ntawd, lo lus nug yog, OnPropertyChanged yog dab tsi? INotifyPropertyChanged yog tus tswv cuab interface hauv System. ComponentModel Namespace. Qhov no interface yog siv los ceeb toom rau Control tias tus nqi vaj tse tau hloov lawm.

Tsis tas li ntawd, Updateourcetrigger WPF yog dab tsi?

UpdateSourceTrigger . Qhov no yog ib qho cuab yeej ntawm kev khi uas tswj cov ntaub ntawv ntws los ntawm lub hom phiaj mus rau qhov chaw thiab siv rau ob txoj kev databinding. Lub neej ntawd hom yog thaum lub hom phiaj hloov pauv tab sis muaj ntau yam kev xaiv muaj, uas peb yuav pom hauv kab lus no.

Koj siv INotifyPropertyChanged li cas?

Rau siv INotifyPropertyChanged koj yuav tsum tshaj tawm qhov kev tshwm sim PropertyChanged thiab tsim cov txheej txheem OnPropertyChanged. Tom qab ntawd rau txhua lub cuab yeej koj xav hloov cov ntawv ceeb toom rau, koj hu rau OnPropertyChanged thaum twg cov cuab yeej hloov kho.

Pom zoo: