Can C# Enums Have Multiple Values Assigned to the Same Integer?

Multiple Values for Enums: A Behind-the-Scenes Look

While working with an EDI file, a developer sought to obscure index positions using an enum. However, they were surprised to discover that multiple enum values could be assigned to the same integer value. Concerns arose about the validity and potential drawbacks of this approach.

The Truth Unleashed

Despite its appearance, an enum in C# is essentially a lightweight struct that derives from System.Enum. The values assigned to an enum are defined as constants. When an enum definition such as the one provided is compiled, it translates into the following pseudocode:

public struct Color : System.Enum
{
    public const int Red = 1;
    public const int Blue = 1;
    public const int Green = 1;
}

This structure reveals that an enum is a collection of constants that share the same integer value. However, there is no inherent issue with this concept.

Potential Caveats

While this approach may initially seem harmless, certain circumstances can potentially lead to unexpected outcomes.

• Conversion Ambiguity: When converting from an integer to an enum type, the first defined value that matches the integer is selected. This can lead to ambiguity when multiple enum values share the same integer value.
• Equality Comparison: Comparing enums with identical underlying integer values will return true, even if they represent different enum members.

Conclusion

Despite these potential caveats, it is possible to utilize enums with non-unique values as long as the potential consequences are understood and accounted for. Ultimately, the decision of whether to use an enum for this purpose depends on the specific requirements and context of the application.

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