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VB.NET Language in a Nutshell, Second Edition by Steven Roman PhD, Paul Lomax, Ron Petrusha

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Name

VarType Function

Class

Microsoft.VisualBasic.Information

Syntax

VarType(varname)
varname (required; any)

The name of a variable

Return Value

A member of the VariantType enumeration indicating the variable type

Description

Determines the data type of a variable

Rules at a Glance

  • The possible values returned by the function include the following members of the VariantType enumeration:

Constant

Value

Description

Array

8192

Array

Boolean

11

Boolean data type

Byte

17

Byte data type

Char

18

Char data type

Date

7

Date data type

Decimal

14

Decimal data type

Double

5

Double data type

Integer

3

Integer data type

Long

20

Long data type

Object

9

Object, uninitialized string, uninitialized array, object of a specific type

Short

2

Short data type

Single

4

Single data type

String

8

String

UserDefinedType

36

A structure

  • If varname is a dimensioned array, the VarType function returns VariantType.Array (8192), plus the value of the array’s data type. For example, an array of strings returns 8192 + 8 = 8200. You can test for an array with a code fragment such as the following:

    If VarType(myVar) And VariantType.Array Then

    You can extract the data type of the array with the following code fragment:

    vartype(myVar) and &HFFFFDFFF
  • All object variables, whether late-bound or early-bound, return VariantType.Object.

  • Data types that are members of the base class library but are not wrapped by VB data types (i.e., UINT16, UINT32 etc.) return VariantType.UserDefinedType ...

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