Video: Yuav ua li cas tub nkeeg pib ua kom tiav net?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lazy pib feem ntau yog siv rau txhim kho kev ua tau zoo, tsis txhob siv cov khoom siv khib nyiab, thiab txo cov kev xav tau ntawm kev nco. Los ntawm kev siv Tub nkeeg mus tshaj tawm cov Orders object rau tub nkeeg pib , koj ua tau zam kev siv cov khoom siv thaum tsis siv khoom.
Tsis tas li ntawd, tub nkeeg pib txhais li cas?
Hauv computer programming, tub nkeeg pib yog lub tactic ntawm ncua lub creation ntawm ib yam khoom, xam tus nqi, los yog lwm yam kim txheej txheem mus txog rau thaum thawj zaug nws yog xav tau. Nws yog ib hom tub nkeeg kev ntsuam xyuas uas hais tshwj xeeb rau cov kev xav ntawm cov khoom lossis lwm yam kev pabcuam.
Tsis tas li ntawd, System tub nkeeg yog dab tsi? Lus hais. Siv tub nkeeg kev pib ua kom ncua kev tsim cov khoom loj lossis cov khoom siv siv zog, lossis kev ua haujlwm ntawm kev siv peev txheej, tshwj xeeb tshaj yog thaum tsim lossis ua tiav yuav tsis tshwm sim thaum lub neej ntawm qhov program. Npaj rau tub nkeeg pib, koj tsim ib qho piv txwv ntawm Tub nkeeg.
Ib yam li ntawd, koj tuaj yeem nug, thaum twg koj yuav tsum siv Lazy T hom?
7 Teb. Koj feem ntau siv nws thaum koj xav rau instantiate ib yam dab tsi thawj zaug nws ua tau siv . Qhov no ncua tus nqi ntawm kev tsim nws txog thaum / thaum nws xav tau es tsis txhob ua rau tus nqi ib txwm muaj. Feem ntau qhov no yog qhov zoo dua thaum qhov khoom yuav lossis tsis yog siv thiab tus nqi ntawm kev tsim nws yog qhov tsis tseem ceeb.
Dab tsi yog tub nkeeg instantiation hauv C #?
Lazy pib yog ib txoj kev uas defers lub creation ntawm ib yam khoom mus txog rau thaum thawj zaug nws yuav tsum tau. Hauv lwm lo lus, pib ntawm cov khoom tshwm sim tsuas yog ntawm kev thov. Nco ntsoov tias cov nqe lus tub nkeeg pib thiab tub nkeeg instantiation txhais tau tias tib yam - lawv tuaj yeem siv sib hloov.
Pom zoo:
Dab tsi yog qhov pib tub nkeeg hauv Singleton?
Lazy Initialization yog ib qho txheej txheem uas ib tug ncua qhov instantiation ntawm ib yam khoom mus txog thaum nws thawj zaug siv. Hauv lwm lo lus, piv txwv ntawm chav kawm yog tsim thaum nws yuav tsum tau siv thawj zaug. Lub tswv yim tom qab no yog kom tsis txhob muaj qhov tsim qauv tsim nyog
Dab tsi yog tub nkeeg instantiation hauv C #?
Lazy pib yog ib qho txheej txheem uas defers lub creation ntawm ib yam khoom mus txog rau thaum thawj zaug nws xav tau. Hauv lwm lo lus, pib ntawm qhov khoom tshwm sim tsuas yog ntawm kev thov
Koj ua li cas thaum ntxov thiab tub nkeeg pib ntawm ib qho khoom?
4 Teb. Zoo Lazy pib txhais tau tias koj tsis pib cov khoom kom txog rau thaum thawj zaug lawv siv. Kev pib ntxov ntxov tsuas yog thim rov qab, koj pib pib ib zaug ib zaug thaum lub sijhawm thauj khoom hauv chav kawm. Muaj ntau txoj hauv kev los ua qhov pib ntxov, ib qho yog los ntawm kev tshaj tawm koj tus singleton li zoo li qub
Dab tsi yog tub nkeeg hauv C#?
Lazy pib yog ib qho txheej txheem uas defers lub creation ntawm ib yam khoom mus txog rau thaum thawj zaug nws xav tau. Hauv lwm lo lus, pib ntawm qhov khoom tshwm sim tsuas yog ntawm kev thov. Nco ntsoov tias cov ntsiab lus tub nkeeg pib thiab tub nkeeg instantiation txhais tau tias tib yam - lawv tuaj yeem siv sib hloov
Vim li cas qhov kev kawm ua piv txwv hu ua tub nkeeg kawm?
Kev kawm raws li piv txwv suav nrog cov neeg nyob ze ze tshaj plaws, qhov ntsuas qhov hnyav hauv zos thiab cov txheej txheem kev xav raws li qhov xwm txheej. Cov txheej txheem ua piv txwv qee zaum hu ua tub nkeeg txoj kev kawm vim tias lawv ncua kev ua haujlwm kom txog rau thaum qhov xwm txheej tshiab yuav tsum tau muab cais tawm