Expression.SwitchCase Expression.SwitchCase Expression.SwitchCase Expression.SwitchCase Method

定義

SwitchCase オブジェクトで使用される SwitchExpression オブジェクトを作成します。Creates a SwitchCase object to be used in a SwitchExpression object.

オーバーロード

SwitchCase(Expression, Expression[]) SwitchCase(Expression, Expression[]) SwitchCase(Expression, Expression[]) SwitchCase(Expression, Expression[])

SwitchCase で使用する SwitchExpression を作成します。Creates a SwitchCase for use in a SwitchExpression.

SwitchCase(Expression, IEnumerable<Expression>) SwitchCase(Expression, IEnumerable<Expression>) SwitchCase(Expression, IEnumerable<Expression>) SwitchCase(Expression, IEnumerable<Expression>)

SwitchCase オブジェクトで使用される SwitchExpression オブジェクトを作成します。Creates a SwitchCase object to be used in a SwitchExpression object.

SwitchCase(Expression, Expression[]) SwitchCase(Expression, Expression[]) SwitchCase(Expression, Expression[]) SwitchCase(Expression, Expression[])

SwitchCase で使用する SwitchExpression を作成します。Creates a SwitchCase for use in a SwitchExpression.

public:
 static System::Linq::Expressions::SwitchCase ^ SwitchCase(System::Linq::Expressions::Expression ^ body, ... cli::array <System::Linq::Expressions::Expression ^> ^ testValues);
public static System.Linq.Expressions.SwitchCase SwitchCase (System.Linq.Expressions.Expression body, params System.Linq.Expressions.Expression[] testValues);
static member SwitchCase : System.Linq.Expressions.Expression * System.Linq.Expressions.Expression[] -> System.Linq.Expressions.SwitchCase
Public Shared Function SwitchCase (body As Expression, ParamArray testValues As Expression()) As SwitchCase

パラメーター

body
Expression Expression Expression Expression

case の本体。The body of the case.

testValues
Expression[]

case のテスト値。The test values of the case.

戻り値

SwitchCase(Expression, IEnumerable<Expression>) SwitchCase(Expression, IEnumerable<Expression>) SwitchCase(Expression, IEnumerable<Expression>) SwitchCase(Expression, IEnumerable<Expression>)

SwitchCase オブジェクトで使用される SwitchExpression オブジェクトを作成します。Creates a SwitchCase object to be used in a SwitchExpression object.

public:
 static System::Linq::Expressions::SwitchCase ^ SwitchCase(System::Linq::Expressions::Expression ^ body, System::Collections::Generic::IEnumerable<System::Linq::Expressions::Expression ^> ^ testValues);
public static System.Linq.Expressions.SwitchCase SwitchCase (System.Linq.Expressions.Expression body, System.Collections.Generic.IEnumerable<System.Linq.Expressions.Expression> testValues);
static member SwitchCase : System.Linq.Expressions.Expression * seq<System.Linq.Expressions.Expression> -> System.Linq.Expressions.SwitchCase
Public Shared Function SwitchCase (body As Expression, testValues As IEnumerable(Of Expression)) As SwitchCase

パラメーター

body
Expression Expression Expression Expression

case の本体。The body of the case.

testValues
IEnumerable<Expression>

case のテスト値。The test values of the case.

戻り値

次の例では、既定のケースが switch ステートメントを表す式を作成する方法を示します。The following example demonstrates how to create an expression that represents a switch statement that has a default case.

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

// An expression that represents the switch value.
ConstantExpression switchValue = Expression.Constant(3);

// This expression represents a switch statement 
// that has a default case.
SwitchExpression switchExpr =
    Expression.Switch(
        switchValue,
        Expression.Call(
                    null,
                    typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),
                    Expression.Constant("Default")
                ),
        new SwitchCase[] {
            Expression.SwitchCase(
                Expression.Call(
                    null,
                    typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),
                    Expression.Constant("First")
                ),
                Expression.Constant(1)
            ),
            Expression.SwitchCase(
                Expression.Call(
                    null,
                    typeof(Console).GetMethod("WriteLine", new Type[] { typeof(String) }),
                    Expression.Constant("Second")
                ),
                Expression.Constant(2)
            )
        }
    );

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

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

' An expression that represents the switch value.
Dim switchValue As ConstantExpression = Expression.Constant(3)

' This expression represents a switch statement 
' that has a default case.
Dim switchExpr As SwitchExpression =
Expression.Switch(
    switchValue,
    Expression.Call(
                Nothing,
                GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}),
                Expression.Constant("Default")
            ),
    New SwitchCase() {
        Expression.SwitchCase(
            Expression.Call(
                Nothing,
                GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}),
                Expression.Constant("First")
            ),
            Expression.Constant(1)
        ),
        Expression.SwitchCase(
            Expression.Call(
                Nothing,
                GetType(Console).GetMethod("WriteLine", New Type() {GetType(String)}),
                Expression.Constant("Second")
            ),
            Expression.Constant(2)
        )
    }
)

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

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

注釈

すべてSwitchCase内のオブジェクトをSwitchExpressionオブジェクトしない限り、同じ型である必要があります、SwitchExpressionタイプvoidします。All SwitchCase objects in a SwitchExpression object must have the same type, unless the SwitchExpression has the type void.

SwitchCaseオブジェクトが暗黙的なbreakステートメントで、暗黙的なフォール スルー 1 つの case ラベルから間がないことを意味します。Each SwitchCase object has an implicit break statement, which means that there is no implicit fall through from one case label to another.

適用対象