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Information.IsReference(Object) Method

  • Reference

Definition

Namespace:
Microsoft.VisualBasic
Assembly:
Microsoft.VisualBasic.Core.dll
Assembly:
Microsoft.VisualBasic.dll
Source:
Information.vb
Source:
Information.vb
Source:
Information.vb

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

public:
 static bool IsReference(System::Object ^ Expression);
public static bool IsReference (object? Expression);
public static bool IsReference (object Expression);
static member IsReference : obj -> bool
Public Function IsReference (Expression As Object) As Boolean

Parameters

Expression
Object

Required. Object expression.

Returns

Boolean

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

Examples

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

Remarks

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.

Applies to

See also