Expression.TypeIs(Expression, Type) Method

Reference

Definition

Namespace:: System.Linq.Expressions

Assemblies:: System.Core.dll, System.Linq.Expressions.dll

Assemblies:: netstandard.dll, System.Linq.Expressions.dll

Assembly:: System.Linq.Expressions.dll

Assembly:: System.Core.dll

Assembly:: netstandard.dll

Source:: TypeBinaryExpression.cs

Source:: TypeBinaryExpression.cs

Source:: TypeBinaryExpression.cs

Important

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Creates a TypeBinaryExpression.

public:
 static System::Linq::Expressions::TypeBinaryExpression ^ TypeIs(System::Linq::Expressions::Expression ^ expression, Type ^ type);

public static System.Linq.Expressions.TypeBinaryExpression TypeIs(System.Linq.Expressions.Expression expression, Type type);

static member TypeIs : System.Linq.Expressions.Expression * Type -> System.Linq.Expressions.TypeBinaryExpression

Public Shared Function TypeIs (expression As Expression, type As Type) As TypeBinaryExpression

Parameters

expression: Expression

An Expression to set the Expression property equal to.

type: Type

A Type to set the TypeOperand property equal to.

Returns

TypeBinaryExpression

A TypeBinaryExpression for which the NodeType property is equal to TypeIs and for which the Expression and TypeOperand properties are set to the specified values.

Exceptions

ArgumentNullException

expression or type is null.

Examples

The following example demonstrates how to use the TypeIs(Expression, Type) method to create a TypeBinaryExpression that represents a type test of a string value against the Int32 type.

// Create a TypeBinaryExpression that represents a
// type test of the string "spruce" against the 'int' type.
System.Linq.Expressions.TypeBinaryExpression typeBinaryExpression =
    System.Linq.Expressions.Expression.TypeIs(
        System.Linq.Expressions.Expression.Constant("spruce"),
        typeof(int));

Console.WriteLine(typeBinaryExpression.ToString());

// This code produces the following output:
//
// ("spruce" Is Int32)

' Create a TypeBinaryExpression that represents a
' type test of the String "spruce" against the Int32 type.
Dim typeBinaryExpression As System.Linq.Expressions.TypeBinaryExpression = _
    System.Linq.Expressions.Expression.TypeIs( _
        System.Linq.Expressions.Expression.Constant("spruce"), _
        Type.GetType("System.Int32"))

Console.WriteLine(typeBinaryExpression.ToString())

' This code produces the following output:
'
' ("spruce" Is Int32)

Remarks

The Type property of the resulting UnaryExpression represents Boolean.

Applies to

Produto	Versões
.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, 10
.NET Framework	3.5, 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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