Narrowing (Visual Basic)
Indicates that a conversion operator (
CType) converts a class or structure to a type that might not be able to hold some of the possible values of the original class or structure.
Converting with the Narrowing Keyword
The conversion procedure must specify
Public Shared in addition to
Narrowing conversions do not always succeed at run time, and can fail or incur data loss. Examples are
Date, and a base type to a derived type. This last conversion is narrowing because the base type might not contain all the members of the derived type and thus is not an instance of the derived type.
Option Strict is
On, the consuming code must use
CType for all narrowing conversions.
Narrowing keyword can be used in this context: