Expression.Goto Metode

Definisi

Ruang nama:

System.Linq.Expressions

Rakitan:

System.Linq.Expressions.dll

Membuat pernyataan "buka" yang GotoExpression mewakili.

Overload

Goto(LabelTarget, Expression, Type)	GotoExpression Membuat pernyataan "buka" yang mewakili dengan jenis yang ditentukan. Nilai yang diteruskan ke label saat melompat dapat ditentukan.
Goto(LabelTarget, Type)	GotoExpression Membuat pernyataan "buka" yang mewakili dengan jenis yang ditentukan.
Goto(LabelTarget)	Membuat pernyataan "buka" yang GotoExpression mewakili.
Goto(LabelTarget, Expression)	Membuat pernyataan "buka" yang GotoExpression mewakili. Nilai yang diteruskan ke label saat melompat dapat ditentukan.

Goto(LabelTarget, Expression, Type)

Sumber:

GotoExpression.cs

GotoExpression Membuat pernyataan "buka" yang mewakili dengan jenis yang ditentukan. Nilai yang diteruskan ke label saat melompat dapat ditentukan.

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

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

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

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

Parameter

target

LabelTarget

Yang LabelTargetGotoExpression akan melompat ke.

value

Expression

Nilai yang akan diteruskan ke label terkait saat melompat.

type

Type

Untuk Type mengatur properti sama Type dengan.

Mengembalikan

GotoExpression

GotoExpression dengan sama dengan Kind Goto, Target properti diatur ke target, Type properti diatur ke type, dan value akan diteruskan ke label target saat melompat.

Goto(LabelTarget, Type)

Sumber:

GotoExpression.cs

GotoExpression Membuat pernyataan "buka" yang mewakili dengan jenis yang ditentukan.

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

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

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

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

Parameter

target

LabelTarget

Yang LabelTargetGotoExpression akan melompat ke.

type

Type

Untuk Type mengatur properti sama Type dengan.

Mengembalikan

GotoExpression

GotoExpression dengan sama dengan Kind Goto, Target properti diatur ke nilai yang ditentukan, Type properti diatur ke type, dan nilai null untuk diteruskan ke label target saat melompat.

Goto(LabelTarget)

Sumber:

GotoExpression.cs

Membuat pernyataan "buka" yang GotoExpression mewakili.

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

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

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

Public Shared Function Goto (target As LabelTarget) As GotoExpression

Parameter

target

LabelTarget

Yang LabelTargetGotoExpression akan melompat ke.

Mengembalikan

GotoExpression

GotoExpression dengan sama dengan Kind Goto, Target properti diatur ke nilai yang ditentukan, dan nilai null untuk diteruskan ke label target saat melompat.

Contoh

Contoh berikut menunjukkan cara membuat ekspresi yang berisi GotoExpression objek .

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

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

// This block contains a GotoExpression.
// 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("GoTo")),
        Expression.Goto(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:
//
// GoTo

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

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

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

' This block contains a GotoExpression.
' 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("GoTo")),
          Expression.Goto(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:
'
' GoTo

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

Goto(LabelTarget, Expression)

Sumber:

GotoExpression.cs

Membuat pernyataan "buka" yang GotoExpression mewakili. Nilai yang diteruskan ke label saat melompat dapat ditentukan.

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

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

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

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

Parameter

target

LabelTarget

Yang LabelTargetGotoExpression akan melompat ke.

value

Expression

Nilai yang akan diteruskan ke label terkait saat melompat.

Mengembalikan

GotoExpression

GotoExpression dengan sama dengan Kind Goto, Target properti diatur ke target, dan value akan diteruskan ke label target saat melompat.