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Visual Studio 2012
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C# Compiler Options
C# Compiler Options Listed Alphabetically
@ (Specify Response File)
/addmodule (Import Metadata)
/appconfig (Specify location of app.config file)
/baseaddress (Specify Base Address of DLL)
/bugreport (Report a Problem)
/checked (Check Integer Arithmetic)
/codepage (Specify Code Page for Source Code Files)
/debug (Emit Debugging Information)
/define (Preprocessor Definition)
/delaysign (Delay Sign the Assembly)
/doc (Process Documentation Comments)
/errorreport (Set Error Reporting Behavior)
/filealign (Specify Section Alignment)
/fullpaths (Specify Fully Qualified Path in Compiler Output)
/help, /? (Compiler Command-Line Help)
/highentropyva (Enable high-entropy ASLR)
/keycontainer (Specify Strong Name Key Container)
/keyfile (Specify Strong Name Key File)
/langversion (Conformant Syntax)
/lib (Specify Assembly Reference Locations)
/link (Link to COM Assembly)
/linkresource (Link to .NET Framework Resource)
/main (Specify Location of Main Method)
/moduleassemblyname (Specify Friend Assembly for Module)
/noconfig (Ignore csc.rsp)
/nologo (Suppress Banner Information)
/nostdlib (Do Not Import Standard Library)
/nowarn (Suppress Specified Warnings)
/nowin32manifest (No Win32 Manifest)
/optimize (Enable/Disable Optimizations)
/out (Set Output File Name)
/pdb (Specify Debug Symbol File)
/platform (Specify Output Platform)
/preferreduilang (Specify a language for compiler output)
/recurse (Find Source Files in Subdirectories)
/reference (Import Metadata)
/resource (Embed Resource File to Output)
/subsystemversion (Specify minimum subsystem version)
/target (Specify Output File Format)
/unsafe (Enable Unsafe Mode)
/utf8output (Display Compiler Messages with UTF-8)
/warn (Specify Warning Level)
/warnaserror (Treat Warnings as Errors)
/win32icon (Import an .ico File)
/win32manifest (Import a Custom Win32 Manifest File)
/win32res (Import a Win32 Resource File)
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/langversion (C# Compiler Options)

Visual Studio 2012

Causes the compiler to accept only syntax that is included in the chosen C# language specification.

Copy 
/langversion:option
option

The following values are valid:

Option

Meaning

default

The compiler accepts all valid language syntax.

ISO-1

The compiler accepts only syntax that is included in the ISO/IEC 23270:2003 C# language specification.

ISO-2

The compiler accepts only syntax that is included in the ISO/IEC 23270:2006 C# language specification. This specification is available on the ISO Web site.

3

The compiler accepts only syntax that is included in the version 3.0 C# Language Specification.

Metadata referenced by your C# application is not subject to /langversion compiler option.

Because each version of the C# compiler contains extensions to the language specification, /langversion does not give you the equivalent functionality of an earlier version of the compiler.

Regardless of which /langversion setting you use, you will use the current version of the common language runtime to create your .exe or .dll. One exception is friend assemblies and /moduleassemblyname (C# Compiler Option), which work under /langversion:ISO-1.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Properties page.

  2. Click the Build property page.

  3. Click the Advanced button.

  4. Modify the Language Version property.

For information about how to set this compiler option programmatically, see LanguageVersion.

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