CA2248Usage Enabled by default: As suggestion

Provide correct enum argument to Enum.HasFlag

Description

The Enum.HasFlag method expects the enum argument to be of the same enum type as the instance on which the method is invoked. If these are different enum types, an unhandled exception will be thrown at runtime.

Cause

The enum type passed as an argument to the HasFlag method call is different from the calling enum type.

How to fix violations

To fix violations, use the same enum type on both the argument and the caller:

Example

public class C
{
    [Flags]
    public enum MyEnum { A, B, }

    [Flags]
    public enum OtherEnum { A, }

    public void Method(MyEnum m)
    {
        m.HasFlag(OtherEnum.A); // Enum types are different, this call will cause an `ArgumentException` to be thrown at runtime

        m.HasFlag(MyEnum.A); // Valid call
    }
}

When to suppress

Do not suppress violations from this rule.

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