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#Const Directive

office 365 dev account|Last Updated: 6/12/2017
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Used to define conditional compiler constants for Visual Basic.


#Constconstname = expression

The #Const compiler directive syntax has these parts:

constnameRequired; Variant ( String ). Name of theconstant; follows standard variable naming conventions.
expressionRequired. 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 themodule in which they appear. It is not possible to createPublic compiler constants 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 using the #Constkeyword can only be used for conditional compilation. Conditional compiler constants are always evaluated at the module level, regardless of their placement in code.


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. 
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