Expression.Continue Méthode

Définition

Crée un GotoExpression qui représente une instruction Continue.Creates a GotoExpression representing a continue statement.

Surcharges

Continue(LabelTarget)

Crée un GotoExpression qui représente une instruction Continue.Creates a GotoExpression representing a continue statement.

Continue(LabelTarget, Type)

Crée un GotoExpression qui représente une instruction Continue avec le type spécifié.Creates a GotoExpression representing a continue statement with the specified type.

Continue(LabelTarget)

Crée un GotoExpression qui représente une instruction Continue.Creates a GotoExpression representing a continue statement.

public:
 static System::Linq::Expressions::GotoExpression ^ Continue(System::Linq::Expressions::LabelTarget ^ target);
public static System.Linq.Expressions.GotoExpression Continue (System.Linq.Expressions.LabelTarget target);
static member Continue : System.Linq.Expressions.LabelTarget -> System.Linq.Expressions.GotoExpression
Public Shared Function Continue (target As LabelTarget) As GotoExpression

Paramètres

target
LabelTarget

LabelTarget auquel GotoExpression accédera.The LabelTarget that the GotoExpression will jump to.

Retours

GotoExpression avec la propriété Kind égale à Continue, la propriété Target égale à target et une valeur null à passer à l'étiquette cible au moment du saut.A GotoExpression with Kind equal to Continue, the Target property set to target, and a null value to be passed to the target label upon jumping.

Exemples

L’exemple suivant montre comment créer une expression de boucle qui utilise la Continue méthode.The following example demonstrates how to create a loop expression that uses the Continue method.

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

// A label that is used by a break statement and a loop. 
LabelTarget breakLabel = Expression.Label();

// A label that is used by the Continue statement and the loop it refers to.
LabelTarget continueLabel = Expression.Label();

// This expression represents a Continue statement.
Expression continueExpr = Expression.Continue(continueLabel);

// A variable that triggers the exit from the loop.
ParameterExpression count = Expression.Parameter(typeof(int));

// A loop statement.
Expression loopExpr = Expression.Loop(
    Expression.Block(
        Expression.IfThen(
            Expression.GreaterThan(count, Expression.Constant(3)),
            Expression.Break(breakLabel)
        ),
        Expression.PreIncrementAssign(count),
        Expression.Call(
                    null,
                    typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),
                    Expression.Constant("Loop")
                ),
        continueExpr,
        Expression.PreDecrementAssign(count)
    ),
    breakLabel,
    continueLabel
);

// The following statement first creates an expression tree,
// then compiles it, and then runs it.
// Without the Continue statement, the loop would go on forever.
Expression.Lambda<Action<int>>(loopExpr, count).Compile()(1);

// This code example produces the following output:
//
// Loop
// Loop
// Loop
' Add the following directive to your file:
' Imports System.Linq.Expressions  

' A label that is used by a break statement and a loop. 
Dim breakLabel As LabelTarget = Expression.Label()

' A label that is used by the Continue statement and the loop it refers to.
Dim continueLabel As LabelTarget = Expression.Label()

' This expression represents a Continue statement.
Dim continueExpr As Expression = Expression.Continue(continueLabel)

' A variable that triggers the exit from the loop.
Dim count As ParameterExpression = Expression.Parameter(GetType(Integer))

' A loop statement.
Dim loopExpr As Expression = Expression.Loop(
       Expression.Block(
           Expression.IfThen(
               Expression.GreaterThan(count, Expression.Constant(3)),
               Expression.Break(breakLabel)
           ),
           Expression.PreIncrementAssign(count),
           Expression.Call(
                       Nothing,
                       GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}),
                       Expression.Constant("Loop")
                   ),
           continueExpr,
           Expression.PreDecrementAssign(count)
       ),
       breakLabel,
       continueLabel
   )

' The following statement first creates an expression tree,
' then compiles it, and then runs it.
' Without the Continue statement, the loop would go on forever.
Expression.Lambda(Of Action(Of Integer))(loopExpr, count).Compile()(1)

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

Continue(LabelTarget, Type)

Crée un GotoExpression qui représente une instruction Continue avec le type spécifié.Creates a GotoExpression representing a continue statement with the specified type.

public:
 static System::Linq::Expressions::GotoExpression ^ Continue(System::Linq::Expressions::LabelTarget ^ target, Type ^ type);
public static System.Linq.Expressions.GotoExpression Continue (System.Linq.Expressions.LabelTarget target, Type type);
static member Continue : System.Linq.Expressions.LabelTarget * Type -> System.Linq.Expressions.GotoExpression

Paramètres

target
LabelTarget

LabelTarget auquel GotoExpression accédera.The LabelTarget that the GotoExpression will jump to.

type
Type

Type auquel la propriété Type doit être égale.An Type to set the Type property equal to.

Retours

GotoExpression avec la propriété Kind égale à Continue, la propriété Target égale à target, la propriété Type égale à type et une valeur null à passer à l'étiquette cible au moment du saut.A GotoExpression with Kind equal to Continue, the Target property set to target, the Type property set to type, and a null value to be passed to the target label upon jumping.

S’applique à