Duration (Pacific Standard Time):
To (Pacific Standard Time):
  • None
User Action:
  • None

Expression.TypeIs Method (Expression, Type)


The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Namespace:   System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

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


Type: System.Linq.Expressions.Expression

An Expression to set the Expression property equal to.

Type: System.Type

A Type to set the TypeOperand property equal to.

Return Value

Type: System.Linq.Expressions.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.

Exception Condition

expression or type is null.

The Type property of the resulting UnaryExpression represents Boolean.

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 Int32 type.
Dim typeBinaryExpression As System.Linq.Expressions.TypeBinaryExpression = _
    System.Linq.Expressions.Expression.TypeIs( _
        System.Linq.Expressions.Expression.Constant("spruce"), _


' This code produces the following output:
' ("spruce" Is Int32)
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Return to top