optioninfer.md

title	-optioninfer
ms.date	07/20/2015
ms.prod	.net
ms.reviewer
ms.suite
ms.technology	devlang-visual-basic
ms.topic	article
f1_keywords	-optioninfer
helpviewer_keywords	-optioninfer compiler option [Visual Basic] /optioninfer compiler option [Visual Basic] optioninfer compiler option [Visual Basic]
ms.assetid	f6c09db1-0553-464a-abe3-d4510c61d6ed
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author	dotnet-bot
ms.author	dotnetcontent

-optioninfer

Enables the use of local type inference in variable declarations.

Syntax

-optioninfer[+ | -]  

Arguments

Term	Definition
+ | -	Optional. Specify -optioninfer+ to enable local type inference, or -optioninfer- to block it. The -optioninfer option, with no value specified, is the same as -optioninfer+. The default value when the -optioninfer switch is not present is also -optioninfer+. The default value is set in the Vbc.rsp response file.

Note

You can use the -noconfig option to retain the compiler's internal defaults instead of those specified in vbc.rsp. The compiler default for this option is -optioninfer-.

Remarks

If the source code file contains an Option Infer Statement, the statement overrides the -optioninfer command-line compiler setting.

To set -optioninfer in the Visual Studio IDE

1. Select a project in Solution Explorer. On the Project menu, click Properties.

2. On the Compile tab, modify the value in the Option infer box.

Example

The following code compiles test.vb with local type inference enabled.

vbc -optioninfer+ test.vb  

See Also

Visual Basic Command-Line Compiler
-optioncompare
-optionexplicit
-optionstrict
Sample Compilation Command Lines
Option Infer Statement
Local Type Inference
Visual Basic Defaults, Projects, Options Dialog Box
Compile Page, Project Designer (Visual Basic)
/noconfig
Building from the Command Line