const-directive.md

title	keywords	f1_keywords	ms.assetid	ms.date	ms.localizationpriority
Const directive	vblr6.chm1014460	vblr6.chm1014460	c5d74b3a-75b1-1263-ab98-82a1a1087207	11/29/2018	medium

#Const directive

Used to define conditional compiler constants for Visual Basic.

Syntax

#Const constname = expression

The #Const compiler directive syntax has these parts:

Part	Description
constname	Required; Variant (String). Name of the constant; follows standard variable naming conventions.
expression	Required. Literal, other conditional compiler constant, or any combination that includes any or all arithmetic or logical operators except Is.

Remarks

Conditional compiler constants are always Private to the module in which they appear. It's not possible to create Public compiler constants by using the #Const directive. Public compiler constants can only be created in the user interface.

Only conditional compiler constants and literals can be used in expression. Using a standard constant defined with Const, or using a constant that is undefined, causes an error to occur. Conversely, constants defined by using the #Const keyword can only be used for conditional compilation.

Conditional compiler constants are always evaluated at the module level, regardless of their placement in code.

Example

This example uses the #Const directive to declare conditional compiler constants for use in #If...#Else...#End If constructs.

#Const DebugVersion = 1 ' Will evaluate true in #If block. 

See also

• Const statement

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