Video: Dab tsi yog tub nkeeg instantiation hauv C #?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
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.
Tsuas yog li ntawd, dab tsi yog tub nkeeg khi hauv C #?
Object on Demand kuj hu ua Lazy loading qauv, Lazy loading ncua kev pib ntawm cov khoom. Qhov no yog ib tug tshiab feature ntawm C# 4.0 thiab tuaj yeem siv tau thaum peb ua haujlwm nrog cov khoom loj thaum nws tsis siv. Txhawm rau zam qhov xwm txheej koj tuaj yeem siv lub Lazy Loading Qauv.
Ib sab saum toj no, 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.
Tom qab ntawd, ib tug kuj yuav nug, vim li cas tub nkeeg pib?
Lazy pib ntawm ib yam khoom txhais tau hais tias nws cov creation yog ncua mus txog rau thaum nws yog thawj zaug siv. (Rau lub ncauj lus no, cov ntsiab lus tub nkeeg pib thiab tub nkeeg instantiation yog synonymous.) Lazy pib feem ntau yog siv los txhim kho kev ua tau zoo, zam kev suav tsis zoo, thiab txo cov kev xav tau ntawm kev nco.
Dab tsi yog System tub nkeeg?
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.
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
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
Yuav ua li cas tub nkeeg pib ua kom tiav net?
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