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IsReference Function

Returns a Boolean value that indicates whether an expression evaluates to a reference type.

Public Function IsReference(ByVal Expression As Object) As Boolean

Expression

Required. Object expression.

IsReference returns True if Expression represents a reference type, such as a class instance, a String type, or an array of any type; otherwise, it returns False.

A reference type contains a pointer to data stored elsewhere in memory. A value type contains its own data.

This example uses the IsReference function to check if several variables refer to reference types.

Dim testArray(3) As Boolean 
Dim testString As String = "Test string" 
Dim testObject As Object = New Object()
Dim testNumber As Integer = 12
testArray(0) = IsReference(testArray)
testArray(1) = IsReference(testString)
testArray(2) = IsReference(testObject)
testArray(3) = IsReference(testNumber)

In the previous example, the first three calls to IsReference return True. The last call returns False, because Integer is a value type, not a reference type.

Namespace: Microsoft.VisualBasic

Module: Information

Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)

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