Expression.Return Método

Definición

Espacio de nombres:

System.Linq.Expressions

Ensamblado:

System.Core.dll

Crea un objeto GotoExpression que representa una instrucción return.

Sobrecargas

Nombre	Description
Return(LabelTarget)	Crea un objeto GotoExpression que representa una instrucción return.
Return(LabelTarget, Expression)	Crea un objeto GotoExpression que representa una instrucción return. Se puede especificar el valor pasado a la etiqueta al saltar.
Return(LabelTarget, Type)	Crea un objeto GotoExpression que representa una instrucción return con el tipo especificado.
Return(LabelTarget, Expression, Type)	Crea un objeto GotoExpression que representa una instrucción return con el tipo especificado. Se puede especificar el valor pasado a la etiqueta al saltar.

Return(LabelTarget)

Crea un objeto GotoExpression que representa una instrucción return.

public:
 static System::Linq::Expressions::GotoExpression ^ Return(System::Linq::Expressions::LabelTarget ^ target);

public static System.Linq.Expressions.GotoExpression Return(System.Linq.Expressions.LabelTarget target);

static member Return : System.Linq.Expressions.LabelTarget -> System.Linq.Expressions.GotoExpression

Public Shared Function Return (target As LabelTarget) As GotoExpression

Parámetros

target

LabelTarget

El LabelTarget al que GotoExpression saltará.

Devoluciones

GotoExpression

un GotoExpression valor con Kind igual a Return, la Target propiedad establecida targeten y un valor NULL que se pasará a la etiqueta de destino al saltar.

Return(LabelTarget, Expression)

Crea un objeto GotoExpression que representa una instrucción return. Se puede especificar el valor pasado a la etiqueta al saltar.

public:
 static System::Linq::Expressions::GotoExpression ^ Return(System::Linq::Expressions::LabelTarget ^ target, System::Linq::Expressions::Expression ^ value);

public static System.Linq.Expressions.GotoExpression Return(System.Linq.Expressions.LabelTarget target, System.Linq.Expressions.Expression value);

static member Return : System.Linq.Expressions.LabelTarget * System.Linq.Expressions.Expression -> System.Linq.Expressions.GotoExpression

Public Shared Function Return (target As LabelTarget, value As Expression) As GotoExpression

Parámetros

target

LabelTarget

El LabelTarget al que GotoExpression saltará.

value

Expression

Valor que se pasará a la etiqueta asociada al saltar.

Devoluciones

GotoExpression

un GotoExpression valor con Kind igual a Continue, la Target propiedad establecida targeten y value que se pasará a la etiqueta de destino al saltar.

Ejemplos

En el ejemplo siguiente se muestra cómo crear una expresión que contenga el Return método .

// Add the following directive to the file:
// using System.Linq.Expressions;

// A label expression of the void type that is the target for Expression.Return().
LabelTarget returnTarget = Expression.Label();

// This block contains a GotoExpression that represents a return statement with no value.
// It transfers execution to a label expression that is initialized with the same LabelTarget as the GotoExpression.
// The types of the GotoExpression, label expression, and LabelTarget must match.
BlockExpression blockExpr =
    Expression.Block(
        Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("Return")),
        Expression.Return(returnTarget),
        Expression.Call(typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }), Expression.Constant("Other Work")),
        Expression.Label(returnTarget)
    );

// The following statement first creates an expression tree,
// then compiles it, and then runs it.
Expression.Lambda<Action>(blockExpr).Compile()();

// This code example produces the following output:
//
// Return

// "Other Work" is not printed because
// the Return expression transfers execution from Expression.Return(returnTarget)
// to Expression.Label(returnTarget).

' Add the following directive to the file:
' Imports System.Linq.Expressions  

' A label expression of the void type that is the target for Expression.Return().
Dim returnTarget As LabelTarget = Expression.Label()

' This block contains a GotoExpression that represents a return statement with no value.
' It transfers execution to a label expression that is initialized with the same LabelTarget as the GotoExpression.
' The types of the GotoExpression, label expression, and LabelTarget must match.
Dim blockExpr As BlockExpression =
      Expression.Block(
          Expression.Call(GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}), Expression.Constant("Return")),
          Expression.Return(returnTarget),
          Expression.Call(GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}), Expression.Constant("Other Work")),
          Expression.Label(returnTarget)
      )

' The following statement first creates an expression tree,
' then compiles it, and then runs it.
Expression.Lambda(Of Action)(blockExpr).Compile()()

' This code example produces the following output:
'
' Return

' "Other Work" is not printed because 
' the Return expression transfers execution from Return(returnTarget)
' to Expression.Label(returnTarget).

Return(LabelTarget, Type)

Crea un objeto GotoExpression que representa una instrucción return con el tipo especificado.

public:
 static System::Linq::Expressions::GotoExpression ^ Return(System::Linq::Expressions::LabelTarget ^ target, Type ^ type);

public static System.Linq.Expressions.GotoExpression Return(System.Linq.Expressions.LabelTarget target, Type type);

static member Return : System.Linq.Expressions.LabelTarget * Type -> System.Linq.Expressions.GotoExpression

Public Shared Function Return (target As LabelTarget, type As Type) As GotoExpression

Parámetros

target

LabelTarget

El LabelTarget al que GotoExpression saltará.

type

Type

que Type se va a establecer la Type propiedad igual a.

Devoluciones

GotoExpression

un GotoExpression valor con Kind igual a Return, la Target propiedad establecida targeten , la Type propiedad establecida typeen y un valor NULL que se pasará a la etiqueta de destino al saltar.

Return(LabelTarget, Expression, Type)

Crea un objeto GotoExpression que representa una instrucción return con el tipo especificado. Se puede especificar el valor pasado a la etiqueta al saltar.

public:
 static System::Linq::Expressions::GotoExpression ^ Return(System::Linq::Expressions::LabelTarget ^ target, System::Linq::Expressions::Expression ^ value, Type ^ type);

public static System.Linq.Expressions.GotoExpression Return(System.Linq.Expressions.LabelTarget target, System.Linq.Expressions.Expression value, Type type);

static member Return : System.Linq.Expressions.LabelTarget * System.Linq.Expressions.Expression * Type -> System.Linq.Expressions.GotoExpression

Public Shared Function Return (target As LabelTarget, value As Expression, type As Type) As GotoExpression

Parámetros

target

LabelTarget

El LabelTarget al que GotoExpression saltará.

value

Expression

Valor que se pasará a la etiqueta asociada al saltar.

type

Type

que Type se va a establecer la Type propiedad igual a.

Devoluciones

GotoExpression

un GotoExpression valor con Kind igual a Continue, la Target propiedad establecida targeten , la Type propiedad establecida typeen y value que se pasará a la etiqueta de destino al saltar.