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QueryableMethodTranslatingExpressionVisitor.TranslateFirstOrDefault Metode

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Definisi

Ruang nama:
Microsoft.EntityFrameworkCore.Query
Rakitan:
Microsoft.EntityFrameworkCore.dll
Paket:
Microsoft.EntityFrameworkCore v3.0.0
Paket:
Microsoft.EntityFrameworkCore v3.1.0
Paket:
Microsoft.EntityFrameworkCore v5.0.0
Paket:
Microsoft.EntityFrameworkCore v6.0.0
Paket:
Microsoft.EntityFrameworkCore v7.0.0
Paket:
Microsoft.EntityFrameworkCore v8.0.0

Menerjemahkan First<TSource>(IQueryable<TSource>) metode atau FirstOrDefault<TSource>(IQueryable<TSource>) dan kelebihan beban lainnya melalui sumber yang diberikan.

protected abstract Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression TranslateFirstOrDefault (Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression source, System.Linq.Expressions.LambdaExpression predicate, Type returnType, bool returnDefault);
protected abstract Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression? TranslateFirstOrDefault (Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression source, System.Linq.Expressions.LambdaExpression? predicate, Type returnType, bool returnDefault);
abstract member TranslateFirstOrDefault : Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression * System.Linq.Expressions.LambdaExpression * Type * bool -> Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression
Protected MustOverride Function TranslateFirstOrDefault (source As ShapedQueryExpression, predicate As LambdaExpression, returnType As Type, returnDefault As Boolean) As ShapedQueryExpression

Parameter

source
ShapedQueryExpression

Kueri berbentuk tempat operator diterapkan.

predicate
LambdaExpression

Predikat yang disediakan dalam panggilan.

returnType
Type

Jenis hasil yang dikembalikan.

returnDefault
Boolean

Nilai yang menunjukkan apakah default harus dikembalikan atau dilemparkan.

Mengembalikan

ShapedQueryExpression

Kueri berbentuk setelah terjemahan.

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