Expression.SwitchCase Method
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Creates a SwitchCase object to be used in a SwitchExpression object.
SwitchCase(Expression, Expression[]) |
Creates a SwitchCase for use in a SwitchExpression. |
SwitchCase(Expression, IEnumerable<Expression>) |
Creates a SwitchCase object to be used in a SwitchExpression object. |
- Source:
- SwitchCase.cs
- Source:
- SwitchCase.cs
- Source:
- SwitchCase.cs
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
Parameters
- body
- Expression
The body of the case.
- testValues
- Expression[]
The test values of the case.
Returns
The created SwitchCase.
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
- Source:
- SwitchCase.cs
- Source:
- SwitchCase.cs
- Source:
- SwitchCase.cs
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
Parameters
- body
- Expression
The body of the case.
- testValues
- IEnumerable<Expression>
The test values of the case.
Returns
The created SwitchCase.
Examples
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
Remarks
All SwitchCase objects in a SwitchExpression object must have the same type, unless the SwitchExpression has the type void
.
Each SwitchCase object has an implicit break
statement, which means that there is no implicit fall through from one case label to another.
Applies to
.NET 9 and other versions
Product | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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