C# 逻辑与的应用

 

Type tp = obj.GetType();

FieldInfo propInfo = tp.GetField(strField
, BindingFlags.Public
| BindingFlags.NonPublic
| BindingFlags.Instance
| BindingFlags.Static
);

 

namespace System.Reflection
{
    [__DynamicallyInvokable, Flags, ComVisible(true)]
    [Serializable]
    public enum BindingFlags
    {
        Default = 0,
        IgnoreCase = 1,
        DeclaredOnly = 2,
        Instance = 4,
        Static = 8,
        Public = 16,
        NonPublic = 32,
        FlattenHierarchy = 64,
        InvokeMethod = 256,
        CreateInstance = 512,
        GetField = 1024,
        SetField = 2048,
        GetProperty = 4096,
        SetProperty = 8192,
        PutDispProperty = 16384,
        PutRefDispProperty = 32768,
        ExactBinding = 65536,
        SuppressChangeType = 131072,
        OptionalParamBinding = 262144,
        IgnoreReturn = 16777216
    }
}

 

 

查看 BindingFlags 枚举，结果发现，运用二进制的逻辑与，能够比较方便、高效、易读的 做出 组合 的场景。

例如，10个元素，只有某些元素间组合可用，其余组合都是不合法，那么，可以将 元素 做个二进制进位的枚举，然后做加法，值不会重复，放到集合里；当前组合，判断是否在集合中存在即可；

逻辑与应该有更简单的算法；