Cov txheej txheem:
Video: System ComponentModel DataAnnotations yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhov system . ComponentModel . Cov ntaub ntawv Namespace. Cov Qhov system . Cov ntaub ntawv namespace muab cov chav kawm attribute uas yog siv los txhais metadata rau ASP. NET MVC thiab ASP. NET cov ntaub ntawv tswj.
Ntawm no, DataAnnotations yog dab tsi?
Cov ntaub ntawv annotation yog cov txheej txheem ntawm kev sau cov ntaub ntawv kom nws siv tau rau kev kawm tshuab. Cov ntaub ntawv tuaj yeem yuav luag txhua yam ntaub ntawv uas tib neeg yuav nkag siab. Qhov no suav nrog: cov duab (los ntawm lub tsheb, xov tooj, lossis cov cuab yeej kho mob) cov ntawv (ua lus Askiv, Mev, Suav, lossis lwm yam lus)
Ib yam li ntawd, cov lus piav qhia hauv C # yog dab tsi? lus feature. Ib lus piav qhia ntawm ib qho kev pab cuam (feem ntau yog ib chav kawm, txoj kev, los yog teb) yog ib qho ntawm cov ntaub ntawv meta-cov ntaub ntawv ntxiv rau qhov kev pab cuam lub caij uas tuaj yeem siv los ua kom zoo nkauj cov ntsiab lus nrog cov lej ntxiv. Hauv Java qhov no hu ua ib annotation, hauv C# qhov no yog hu ua tus cwj pwm.
Tib neeg kuj nug, DataAnnotations MVC yog dab tsi?
Kev tshaj tawm. Cov ntaub ntawv yog siv los configure koj cov qauv chav kawm, uas yuav qhia txog cov feem ntau xav configurations. Cov ntaub ntawv kuj to taub los ntawm ib tug xov tooj ntawm. NET applications, xws li ASP. NET MVC , uas tso cai rau cov ntawv thov no siv tib cov lus piav qhia rau cov neeg siv khoom siv sab nraud.
Dab tsi yog lwm cov ntaub ntawv annotation tus cwj pwm rau kev siv tau hauv MVC?
Ntawm no, yog ib daim ntawv teev npe ntawm qee cov ntaub ntawv tseem ceeb Cov Lus Qhia Tshaj Tawm
- Yuav tsum tau. Qhia meej tias Input teb tsis tuaj yeem khoob.
- DisplayName. Qhia meej lub npe zaub rau ib qho khoom.
- StringLength. Qhia qhov tsawg kawg nkaus thiab qhov ntev tshaj plaws rau cov cuab yeej.
- Ntau yam. Qhia txog qhov ntau ntawm tus lej.
- khi.
- ScaffoldColumn.
- DisplayFormat.
- ReadOnly.
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DataAnnotations yog dab tsi?
Cov ntaub ntawv Annotations yog cov cwj pwm uas siv rau hauv chav kawm lossis cov tswv cuab uas qhia txog kev siv tau cov cai, qhia meej tias cov ntaub ntawv tau tshwm sim li cas, thiab teeb tsa kev sib raug zoo ntawm cov chav kawm. Qhov System. ComponentModel. DataAnnotations namespace muaj cov chav kawm uas siv los ua cov ntaub ntawv tus cwj pwm
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