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QueryableMethodTranslatingExpressionVisitor.TranslateFirstOrDefault 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

Translates First<TSource>(IQueryable<TSource>) method or FirstOrDefault<TSource>(IQueryable<TSource>) and their other overloads over the given source.

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

Parameters

source
ShapedQueryExpression

The shaped query on which the operator is applied.

predicate
LambdaExpression

The predicate supplied in the call.

returnType
Type

The return type of result.

returnDefault
Boolean

A value indicating whether default should be returned or throw.

Returns

ShapedQueryExpression

The shaped query after translation.

Applies to