QueryableMethodTranslatingExpressionVisitor.TranslateLeftJoin Method

Reference

Definition

Namespace:: Microsoft.EntityFrameworkCore.Query

Assembly:: Microsoft.EntityFrameworkCore.dll

Package:: Microsoft.EntityFrameworkCore v3.0.0

Package:: Microsoft.EntityFrameworkCore v3.1.0

Package:: Microsoft.EntityFrameworkCore v5.0.0

Package:: Microsoft.EntityFrameworkCore v6.0.0

Package:: Microsoft.EntityFrameworkCore v7.0.0

Package:: Microsoft.EntityFrameworkCore v8.0.0

Important

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Translates LeftJoin over the given source.

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);

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

Parameters

outer: ShapedQueryExpression

The shaped query on which the operator is applied.

inner: ShapedQueryExpression

The inner shaped query to perform join with.

outerKeySelector: LambdaExpression

The key selector for the outer source.

innerKeySelector: LambdaExpression

The key selector for the inner source.

resultSelector: LambdaExpression

The result selector supplied in the call.

Returns

ShapedQueryExpression

The shaped query after translation.

Remarks

Certain patterns of GroupJoin-DefaultIfEmpty-SelectMany represents a left join in database. We identify such pattern in advance and convert it to join like syntax.

Applies to

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