Skip to content

Tweak constants programming guide #38055

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Nov 14, 2023
Merged

Tweak constants programming guide #38055

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
19fccf8
Tweak constants programming guide
Rageking8 Nov 14, 2023
424d2e8
Be explicit about the reference type being constant
Rageking8 Nov 14, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 2 additions & 2 deletions docs/csharp/programming-guide/classes-and-structs/constants.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,14 +2,14 @@
title: "Constants - C# Programming Guide"
description: Constants in C# are compile-time literal values, which do not change once the program is compiled. Only C# built-in types can be constants.
ms.date: 07/20/2015
helpviewer_keywords:
helpviewer_keywords:
- "C# language, constants"
- "constants [C#]"
ms.assetid: 1fb39621-1738-49b1-a1b3-8587f109123f
---
# Constants (C# Programming Guide)

Constants are immutable values which are known at compile time and do not change for the life of the program. Constants are declared with the [const](../../language-reference/keywords/const.md) modifier. Only the C# [built-in types](../../language-reference/builtin-types/built-in-types.md) (excluding <xref:System.Object?displayProperty=nameWithType>) may be declared as `const`. User-defined types, including classes, structs, and arrays, cannot be `const`. Use the [readonly](../../language-reference/keywords/readonly.md) modifier to create a class, struct, or array that is initialized one time at run time (for example in a constructor) and thereafter cannot be changed.
Constants are immutable values which are known at compile time and do not change for the life of the program. Constants are declared with the [const](../../language-reference/keywords/const.md) modifier. Only the C# [built-in types](../../language-reference/builtin-types/built-in-types.md) may be declared as `const`. Reference type constants other than <xref:System.String> can only be initialized with a [null](../../language-reference/keywords/null.md) value. User-defined types, including classes, structs, and arrays, cannot be `const`. Use the [readonly](../../language-reference/keywords/readonly.md) modifier to create a class, struct, or array that is initialized one time at run time (for example in a constructor) and thereafter cannot be changed.

C# does not support `const` methods, properties, or events.

Expand Down