NOTES_OF_PROGRAMMER Telegram 628
ΠžΡ‡Π΅Π½ΡŒ простой ΠΈ строготипизированный PredicateBuilder - ΠΊΠΎΠ³Π΄Π° Π½Π°Π΄ΠΎ ΡΠΎΠ±Ρ€Π°Ρ‚ΡŒ Π²Ρ‹Ρ€Π°ΠΆΠ΅Π½ΠΈΠ΅ Π² EF Π²ΠΈΠ΄Π°
select  ...
from table1
where (x=1 and y=2) or (x=3 and y=5) or (x=3 and y=5 and coef>1)

(ΠΈΠ»ΠΈ Π΄Ρ€ΡƒΠ³ΠΈΡ… условий) ΠΈ Π²ΠΎΡ‚ этих условий Π² OR нСизвСстноС (динамичСскоС) количСство, зависящСС ΠΎΡ‚ Π²Π½Π΅ΡˆΠ½ΠΈΡ… условий.

Π‘ Ρ‚Ρ€Π°Π΄ΠΈΡ†ΠΈΠΎΠ½Π½Ρ‹ΠΌ AND ΠΎΠ±Ρ‹Ρ‡Π½ΠΎ Π½ΠΈΠΊΠ°ΠΊΠΈΡ… ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌ:
var q = db.Items.AsQueryable();
q = q.Where(...);
q = q.Where(...);
...
var items = await q.ToArrayAsync();

А Π²ΠΎΡ‚ с OR Ρ‚Π°ΠΊΠΎΠ³ΠΎ Π½Π΅ ΠΏΡ€ΠΎΠΊΠ°Ρ‚ΠΈΡ‚, Ρ‚Π°ΠΊ Ρ‡Ρ‚ΠΎ PredicateBuilder спасаСт Π² этом случаС. #dotnet
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ΠžΡ‡Π΅Π½ΡŒ простой ΠΈ строготипизированный PredicateBuilder - ΠΊΠΎΠ³Π΄Π° Π½Π°Π΄ΠΎ ΡΠΎΠ±Ρ€Π°Ρ‚ΡŒ Π²Ρ‹Ρ€Π°ΠΆΠ΅Π½ΠΈΠ΅ Π² EF Π²ΠΈΠ΄Π°

select  ...
from table1
where (x=1 and y=2) or (x=3 and y=5) or (x=3 and y=5 and coef>1)

(ΠΈΠ»ΠΈ Π΄Ρ€ΡƒΠ³ΠΈΡ… условий) ΠΈ Π²ΠΎΡ‚ этих условий Π² OR нСизвСстноС (динамичСскоС) количСство, зависящСС ΠΎΡ‚ Π²Π½Π΅ΡˆΠ½ΠΈΡ… условий.

Π‘ Ρ‚Ρ€Π°Π΄ΠΈΡ†ΠΈΠΎΠ½Π½Ρ‹ΠΌ AND ΠΎΠ±Ρ‹Ρ‡Π½ΠΎ Π½ΠΈΠΊΠ°ΠΊΠΈΡ… ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌ:
var q = db.Items.AsQueryable();
q = q.Where(...);
q = q.Where(...);
...
var items = await q.ToArrayAsync();

А Π²ΠΎΡ‚ с OR Ρ‚Π°ΠΊΠΎΠ³ΠΎ Π½Π΅ ΠΏΡ€ΠΎΠΊΠ°Ρ‚ΠΈΡ‚, Ρ‚Π°ΠΊ Ρ‡Ρ‚ΠΎ PredicateBuilder спасаСт Π² этом случаС. #dotnet

BY πŸ““ Записки ΠΏΡ€ΠΎΠ³Ρ€Π°ΠΌΠΌΠ΅Ρ€Π°


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