arphox

// preform (this & flags) != flags
FCIMPL2(FC_BOOL_RET, ReflectionEnum::InternalHasFlag, Object *pRefThis, Object* pRefFlags)
{
    FCALL_CONTRACT;

    VALIDATEOBJECT(pRefThis);

    BOOL cmp = false;

    _ASSERTE(pRefFlags != NULL); // Enum.cs would have thrown ArgumentNullException before calling into InternalHasFlag

arphox

[System.Security.SecuritySafeCritical]
public Boolean HasFlag(Enum flag) {
    if (flag == null)
        throw new ArgumentNullException("flag");
    Contract.EndContractBlock();

    if (!this.GetType().IsEquivalentTo(flag.GetType())) {
        throw new ArgumentException(Environment.GetResourceString("Argument_EnumTypeDoesNotMatch", flag.GetType(), this.GetType()));
    }