Shared naming conventions allow teams to collaborate efficiently. This rule checks that all enum names match a provided regular expression.

The default configuration is the one recommended by Microsoft:

• Pascal casing, starting with an upper case character, e.g. BackColor
• Short abbreviations of 2 letters can be capitalized, e.g. GetID
• Longer abbreviations need to be lower case, e.g. GetHtml
• If the enum is marked as [Flags] then its name should be plural (e.g. MyOptions), otherwise, names should be singular (e.g. MyOption)

Noncompliant Code Example

With the default regular expression for non-flags enums: ^([A-Z]{1,3}[a-z0-9]+)*([A-Z]{2})?$

public enum foo // Noncompliant
{
    FooValue = 0
}

With the default regular expression for flags enums: ^([A-Z]{1,3}[a-z0-9]+)*([A-Z]{2})?s$

[Flags]
public enum Option // Noncompliant
{
    None = 0,
    Option1 = 1,
    Option2 = 2
}

Compliant Solution

public enum Foo
{
    FooValue = 0
}

[Flags]
public enum Options
{
    None = 0,
    Option1 = 1,
    Option2 = 2
}