ProjectionExpression Class

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

An expression that represents a projection in SelectExpression.

public class ProjectionExpression : System.Linq.Expressions.Expression, Microsoft.EntityFrameworkCore.Query.IPrintableExpression

public sealed class ProjectionExpression : System.Linq.Expressions.Expression, Microsoft.EntityFrameworkCore.Query.IPrintableExpression

[System.Diagnostics.DebuggerDisplay("{Microsoft.EntityFrameworkCore.Query.ExpressionPrinter.Print(this), nq}")]
public sealed class ProjectionExpression : System.Linq.Expressions.Expression, Microsoft.EntityFrameworkCore.Query.IPrintableExpression

[System.Diagnostics.DebuggerDisplay("{Microsoft.EntityFrameworkCore.Query.ExpressionPrinter.Print(this), nq}")]
public sealed class ProjectionExpression : System.Linq.Expressions.Expression, Microsoft.EntityFrameworkCore.Query.IPrintableExpression, Microsoft.EntityFrameworkCore.Query.IRelationalQuotableExpression

type ProjectionExpression = class
    inherit Expression
    interface IPrintableExpression

[<System.Diagnostics.DebuggerDisplay("{Microsoft.EntityFrameworkCore.Query.ExpressionPrinter.Print(this), nq}")>]
type ProjectionExpression = class
    inherit Expression
    interface IPrintableExpression

[<System.Diagnostics.DebuggerDisplay("{Microsoft.EntityFrameworkCore.Query.ExpressionPrinter.Print(this), nq}")>]
type ProjectionExpression = class
    inherit Expression
    interface IRelationalQuotableExpression
    interface IPrintableExpression

Public Class ProjectionExpression
Inherits Expression
Implements IPrintableExpression

Public NotInheritable Class ProjectionExpression
Inherits Expression
Implements IPrintableExpression

Public NotInheritable Class ProjectionExpression
Inherits Expression
Implements IPrintableExpression, IRelationalQuotableExpression

Inheritance: Expression
ProjectionExpression

Attributes: DebuggerDisplayAttribute

Implements: IPrintableExpression IRelationalQuotableExpression

Remarks

This is a simple wrapper around a SqlExpression and an alias. Instances of this type cannot be constructed by application or database provider code. If this is a problem for your application or provider, then please file an issue at github.com/dotnet/efcore.

Constructors

ProjectionExpression(SqlExpression, String)

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.

Properties

Alias	The alias assigned to this projection, if any.
Expression	The SQL value which is being projected.
NodeType	Gets the node type of this Expression.
Type	Gets the static type of the expression that this Expression represents.

Methods

Equals(Object)	System.Linq.Expressions.Expression.Equals(System.Object)
GetHashCode()	System.Linq.Expressions.Expression.GetHashCode
Print(ExpressionPrinter)
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.
Update(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.
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.

Explicit Interface Implementations

IPrintableExpression.Print(ExpressionPrinter)

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

Applies to

Partager via