有办法检查我是否在一系列旗帜中有旗帜？
例:
[Flags]
Enum TestEnum
{
ALIVE, DEAD, ALMOSTDEAD, HURT, OTHERS
}
// check if is alive and has been hurt
TestEnum aTest = TestEnum.ALIVE | TestEnum.HURT
bool aTest2 = aTest.HasFlag(TestEnum.ALIVE)
但a.Test.HasFlag即使没有TestEnum.ALIVE,总是返回true