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Enumerations are Visual Basic data types which hold sets of integer constants. Enumerations are useful to define family of constants to be used by the developers (i.e. options).
Refer Enumerations article for more information about enumerators.
Enumerators are treated as any other data types and can be declared and assigned. Enumerations can be assigned implicitly and explicitly.
Dim myEnumVal As MyEnum_e Dim myEnumVal1 As MyEnum_e myEnumVal = MyEnum_e.Val1 'assigning the enumerator explicitly stating the name of enumerator myEnumVal1 = Val1 'implicit assignment of the enumerator
Visual Basic allows to create new data groups. Custom user-defined Type is a data type, also known as Structure which allows to define complex data storage. Types are useful when it is required to pass or store the data which consists of multiple elements (e.g. geometrical point, log entry, etc.)
Refer Custom User Defined Types article for more information about custom types.
Unlike enumerations and types classes can only be created in separate Visual Basic class modules.
Classes are reference types and must be initiated with new keyword and reference must be assigned using Set keyword.
Refer Classes article for more information about classes.
Code example below shows how to declare and assign enumerator, type and class.
Public Member As String Private Sub Class_Initialize() End Sub
Enum MyEnum_e Val1 = 0 Val2 = 1 Val3 = 3 End Enum Type MyStruct Field1 As String Field2 As Boolean End Type Sub main() Dim enumVar As MyEnum_e enumVar = Val2 Dim typeVar As MyStruct typeVar.Field1 = "Hello World" Dim classVar As MyClass Set classVar = New MyClass classVar.Member = "Hello World" End Sub