C# phau ntawv txhais lus yog dab tsi?

Video: C# phau ntawv txhais lus yog dab tsi?

2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47

Hauv C# , Phau ntawv txhais lus yog ib tug generic sau uas feem ntau yog siv los khaws cov key/value khub. Kev ua haujlwm ntawm Phau ntawv txhais lus Nws zoo ib yam li cov uas tsis yog-generic hashtable. Qhov zoo ntawm Phau ntawv txhais lus yog, nws yog hom generic. Phau ntawv txhais lus yog txhais raws li System.

Ib yam li ntawd, tib neeg nug, Dab tsi yog qhov txawv ntawm Hashtable thiab Dictionary hauv C #?

Hashable yog ib qho yooj yim ntaus ntawv (tsis yog-generic), qhov no txhais tau tias nws khaws cov khoom tseem ceeb ntawm cov ntaub ntawv hom. Phau ntawv txhais lus yog ib tug generic collection. Yog li nws tuaj yeem khaws cov khoom tseem ceeb ntawm cov ntaub ntawv tshwj xeeb. Mus saib Hashable los yog Phau ntawv txhais lus hauv C# tshooj lus qhia kom paub ntxiv.

Ib yam li ntawd, KeyValuePair C# yog dab tsi? KeyValuePair hauv C# CsharpProgrammingServer Side Programming. Cov KeyValuePair chav kawm khaws ib khub ntawm qhov tseem ceeb hauv ib daim ntawv teev npe nrog C# . Teeb KeyValuePair thiab ntxiv cov ntsiab lus − var myList = New List< KeyValuePair > (); // ntxiv cov ntsiab lus myList.

Ib yam li ntawd, nws tau nug, yog phau ntawv txhais lus siv hom C#?

Yog tias Hom ntawm tus nqi ntawm cov phau ntawv txhais lus yog tus nqi hom ces tus nqi tiag tiag yuav tau theej. hom siv yog khaws cia li cov ntaub ntawv ib txwm. tus nqi hom tau theej (simplistically byte sawv cev luam yog tsim, txawm li cas los xij tag nrho siv tseem yuav muaj nqis cov ntaub ntawv ), tshwj tsis yog dhau los ua ref rau cov haujlwm.

Qhov twg yog phau ntawv txhais lus sai dua lossis Hashtable?

A Phau ntawv txhais lus ntawm ib hom tshwj xeeb (lwm yam tsis yog Object) muaj kev ua tau zoo dua li a Hashable rau hom nqi vim cov ntsiab lus ntawm Hashable yog hom Object thiab, yog li ntawd, boxing thiab unboxing feem ntau tshwm sim yog khaws cia los yog retrieving ib tug nqi hom.

Pom zoo:

Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas kev lag luam?

Cov Ntawv Txhais Lus Cov Ntaub Ntawv yog RML cov qauv ntaub ntawv uas khaws cov ntsiab lus ntawm qib teb txog cov ntaub ntawv hauv ib qho system lossis cov tshuab. Thaum lub sij hawm qhov yuav tsum tau ua, lub hom phiaj tsis yog ntawm cov ntaub ntawv tiag tiag hauv cov ntaub ntawv lossis kev tsim qauv tsim nyog los siv cov khoom lag luam cov ntaub ntawv hauv cov ntaub ntawv

Dab tsi yog cov txiaj ntsig ntawm phau ntawv txhais lus cov ntaub ntawv?

Ib phau ntawv txhais lus tau tsim muaj tuaj yeem muab cov koom haum thiab kev lag luam ntau cov txiaj ntsig, suav nrog: Txhim kho cov ntaub ntawv zoo. Txhim kho kev ntseeg siab ntawm cov ntaub ntawv ncaj ncees. Txhim kho cov ntaub ntawv thiab kev tswj xyuas. Txo cov ntaub ntawv redundancy. Rov qab siv cov ntaub ntawv. Kev sib raug zoo ntawm kev siv cov ntaub ntawv. Kev txheeb xyuas cov ntaub ntawv yooj yim dua. Txhim kho kev txiav txim siab raws li cov ntaub ntawv zoo dua

Dab tsi yog cov ntaub ntawv phau ntawv txhais lus hauv kev txheeb xyuas thiab tsim qauv?

Cov ntaub ntawv phau ntawv txhais lus. Los ntawm Systems Analysis and Design: A Structured Approach: A data Dictionary is a collection of data about data. Nws tuav cov ntaub ntawv hais txog kev txhais, qauv, thiab kev siv ntawm txhua cov ntaub ntawv uas lub koom haum siv. Muaj ntau tus cwj pwm uas yuav khaws cia txog cov ntaub ntawv keeb

Dab tsi yog cov txiaj ntsig tseem ceeb ntawm kev siv phau ntawv txhais lus cov ntaub ntawv?

Ib phau ntawv txhais lus tsim tau tuaj yeem muab cov koom haum thiab cov lag luam muaj txiaj ntsig ntau, suav nrog: Txhim kho cov ntaub ntawv zoo. Txhim kho kev ntseeg siab ntawm cov ntaub ntawv ncaj ncees. Txhim kho cov ntaub ntawv thiab kev tswj xyuas. Txo cov ntaub ntawv redundancy. Rov qab siv cov ntaub ntawv. Kev sib raug zoo ntawm kev siv cov ntaub ntawv. Kev txheeb xyuas cov ntaub ntawv yooj yim dua. Txhim kho kev txiav txim siab raws li cov ntaub ntawv zoo dua