LeftJoinExpression Class

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An expression that represents a LEFT JOIN in a SQL tree.

This type is typically used by database providers (and other extensions). It is generally not used in application code.

public class LeftJoinExpression : Microsoft.EntityFrameworkCore.Query.SqlExpressions.PredicateJoinExpressionBase

type LeftJoinExpression = class
    inherit PredicateJoinExpressionBase

Public Class LeftJoinExpression
Inherits PredicateJoinExpressionBase

Inheritance: Expression

TableExpressionBase

JoinExpressionBase

PredicateJoinExpressionBase
LeftJoinExpression

Constructors

LeftJoinExpression(TableExpressionBase, SqlExpression, Boolean, IReadOnlyDictionary<String,IAnnotation>)	This is an internal API that supports the Entity Framework Core infrastructure and not subject to the same compatibility standards as public APIs. It may be changed or removed without notice in any release. You should only use it directly in your code with extreme caution and knowing that doing so can result in application failures when updating to a new Entity Framework Core release.
LeftJoinExpression(TableExpressionBase, SqlExpression, Boolean)	Creates a new instance of the LeftJoinExpression class.
LeftJoinExpression(TableExpressionBase, SqlExpression)	Creates a new instance of the LeftJoinExpression class.

Properties

Alias	The alias assigned to this table source. (Inherited from TableExpressionBase)
Annotations	An indexed collection of annotations associated with this table expression. (Inherited from TableExpressionBase)
IsPrunable	Whether this join expression may be pruned if nothing references a column on it. This isn't the case, for example, when an INNER JOIN is used to filter out rows. (Inherited from JoinExpressionBase)
JoinPredicate	The predicate used in join. (Inherited from PredicateJoinExpressionBase)
NodeType	(Inherited from TableExpressionBase)
Table	Gets the underlying table source to join with. (Inherited from JoinExpressionBase)
Type	(Inherited from TableExpressionBase)

Methods

AddAnnotation(String, Object)	Adds an annotation to this object. Throws if an annotation with the specified name already exists. (Inherited from TableExpressionBase)
Clone(String, ExpressionVisitor)	Creates a new object that is a copy of the current instance. (Inherited from JoinExpressionBase)
CreateWithAnnotations(IEnumerable<IAnnotation>)	Creates an object like this with specified annotations.
CreateWithAnnotations(IEnumerable<IAnnotation>)	Creates an object like this with specified annotations. (Inherited from TableExpressionBase)
Equals(Object)	System.Linq.Expressions.Expression.Equals(System.Object)
FindAnnotation(String)	Gets the annotation with the given name, returning `null` if it does not exist. (Inherited from TableExpressionBase)
GetAnnotations()	Gets all annotations on the current object. (Inherited from TableExpressionBase)
GetHashCode()	System.Linq.Expressions.Expression.GetHashCode
GetRequiredAlias()	This is an internal API that supports the Entity Framework Core infrastructure and not subject to the same compatibility standards as public APIs. It may be changed or removed without notice in any release. You should only use it directly in your code with extreme caution and knowing that doing so can result in application failures when updating to a new Entity Framework Core release. (Inherited from JoinExpressionBase)
Print(ExpressionPrinter)	Creates a printable string representation of the given expression using ExpressionPrinter.
PrintAnnotations(ExpressionPrinter)	Creates a printable string representation of annotations associated with the given expression using ExpressionPrinter. (Inherited from TableExpressionBase)
Quote()	System.Linq.Expressions.Expression.Quote
Quote()	Quotes the expression; that is, returns an expression that, when evaluated, would construct an expression identical to this one. Used to generate code for precompiled queries, which reconstructs this expression. (Inherited from TableExpressionBase)
Update(TableExpressionBase, SqlExpression)	Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression.
Update(TableExpressionBase)	Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression.
Update(TableExpressionBase)	Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression. (Inherited from JoinExpressionBase)
VisitChildren(ExpressionVisitor)	Reduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible.
VisitChildren(ExpressionVisitor)	(Inherited from PredicateJoinExpressionBase)
WithAlias(String)	The implementation of WithAlias(String) for join expressions always throws, since the alias on joins is always `null`. Set the alias on the enclosed table expression instead. (Inherited from JoinExpressionBase)
WithAnnotations(IReadOnlyDictionary<String,IAnnotation>)	Creates an object like this with specified annotations.
WithAnnotations(IReadOnlyDictionary<String,IAnnotation>)	Creates an object like this with specified annotations. (Inherited from TableExpressionBase)

Explicit Interface Implementations

IPrintableExpression.Print(ExpressionPrinter)

Creates a printable string representation of the given expression using ExpressionPrinter.

(Inherited from TableExpressionBase)

Extension Methods

UnwrapJoin(TableExpressionBase)

If the given table is a JoinExpressionBase, returns the table it joins to. Otherwise, returns table.

Applies to

通过