Using (Namespaces)
Brings namespace symbols into the current scope
Using identifier [, identifier [, ...] ]
The Using command allows all symbols from a given namespace to be accessed without the namespace's name prefix. Unlike C++ but like C#, the Namespace keyword is not needed after Using, because individual symbols cannot be inherited from a namespace. Inheriting a whole namespace can save typing, but sometimes some meaning of the code can be lost, and conflicts with other symbols could be created.
Syntax
Using identifier [, identifier [, ...] ]
Parameters
Description
The Using command allows all symbols from a given namespace to be accessed without the namespace's name prefix. Unlike C++ but like C#, the Namespace keyword is not needed after Using, because individual symbols cannot be inherited from a namespace. Inheriting a whole namespace can save typing, but sometimes some meaning of the code can be lost, and conflicts with other symbols could be created.
Example
Namespace Sample
Type T
x As Integer
End Type
End Namespace
'' Just using the name T would not find the symbol,
'' because it is inside a namespace.
Dim SomeVariable As Sample.T
'' Now the whole namespace has been inherited into
'' the global namespace.
Using Sample
'' This statement is valid now, since T exists
'' without the "Sample." prefix.
Dim OtherVariable As T
Type T
x As Integer
End Type
End Namespace
'' Just using the name T would not find the symbol,
'' because it is inside a namespace.
Dim SomeVariable As Sample.T
'' Now the whole namespace has been inherited into
'' the global namespace.
Using Sample
'' This statement is valid now, since T exists
'' without the "Sample." prefix.
Dim OtherVariable As T
Differences from QB
- QB had the Using keyword, but for other purposes. Namespaces did not exist in QB.
See also
