QueryableMethodTranslatingExpressionVisitor.TranslateLeftJoin Metodo

Definizione

Spazio dei nomi:

Microsoft.EntityFrameworkCore.Query

Assembly:

Microsoft.EntityFrameworkCore.dll

Pacchetto:

Microsoft.EntityFrameworkCore v9.0.0

Origine:

QueryableMethodTranslatingExpressionVisitor.cs

Converte LeftJoin sull'origine specificata.

protected abstract Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression? TranslateLeftJoin (Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression outer, Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression inner, System.Linq.Expressions.LambdaExpression outerKeySelector, System.Linq.Expressions.LambdaExpression innerKeySelector, System.Linq.Expressions.LambdaExpression resultSelector);

abstract member TranslateLeftJoin : Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression * Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression * System.Linq.Expressions.LambdaExpression * System.Linq.Expressions.LambdaExpression * System.Linq.Expressions.LambdaExpression -> Microsoft.EntityFrameworkCore.Query.ShapedQueryExpression

Protected MustOverride Function TranslateLeftJoin (outer As ShapedQueryExpression, inner As ShapedQueryExpression, outerKeySelector As LambdaExpression, innerKeySelector As LambdaExpression, resultSelector As LambdaExpression) As ShapedQueryExpression

Parametri

outer

ShapedQueryExpression

Query con forma su cui viene applicato l'operatore.

inner

ShapedQueryExpression

Query con forma interna con cui eseguire l'join.

outerKeySelector

LambdaExpression

Selettore chiave per l'origine esterna.

innerKeySelector

LambdaExpression

Selettore chiave per l'origine interna.

resultSelector

LambdaExpression

Selettore dei risultati fornito nella chiamata.

Restituisce

ShapedQueryExpression

Query con forma dopo la traduzione.

Commenti

Alcuni modelli di GroupJoin-DefaultIfEmpty-SelectMany rappresentano un join sinistro nel database. Questo modello viene identificato in anticipo e convertito in join come sintassi.