Visual Basic .NET Language Option Infer What is it?
Example
Enables the use of local type inference in declaring variables.
What is type inference?
You can declare local variables without explicitly stating a data type. The compiler infers the data type of a variable from the type of its initialization expression.
Option Infer On:
Dim aString = "1234" '--> Will be treated as String by the compiler
Dim aNumber = 4711 '--> Will be treated as Integer by the compiler
vs. explicit type declaration:
'State a type explicitly
Dim aString as String = "1234"
Dim aNumber as Integer = 4711
Option Infer Off:
The compiler behavior with Option Infer Off depends on the Option Strict setting
which is already documented here.
-
Option Infer Off - Option Strict Off
All variables without explicit type declarations are declared asObject.Dim aString = "1234" '--> Will be treated as Object by the compiler -
Option Infer Off - Option Strict On
The compiler won´t let you declare a variable without an explicit type.'Dim aString = "1234" '--> Will not compile due to missing type in declaration
