采用位或的枚举处理（示例）

    public class EnumTest
    {
        [Fact]
        public void EnumOR()
        {
            var mix = TestEnum.apple | TestEnum.orange;
            Assert.True((mix & TestEnum.apple) != 0);
            Assert.True((3 & 2) != 0);
            Assert.True((3 & (int)TestEnum.apple) != 0);
            Assert.True((mix & TestEnum.tomato) == 0);
            Assert.True((3 & (int)TestEnum.tomato) == 0);
            Assert.True(mix.HasFlag(TestEnum.orange));

            Assert.True(mix.ToString()== "apple, orange");
            Assert.True((int)mix == 3);
        }

        [Flags]
        public enum TestEnum
        {
            apple=1,
            orange=2,
            potato=4,
            tomato=8
        }
    }

　　

 

 

原文：https://stackoverflow.com/questions/3883384/practical-applications-of-bitwise-operations

 

I use bitwise operators for security in my applications. I'll store the different levels inside of an Enum:

 

[Flags]
public enum SecurityLevel
{
    User = 1, // 0001
    SuperUser = 2, // 0010
    QuestionAdmin = 4, // 0100
    AnswerAdmin = 8 // 1000
}

And then assign a user their levels:

// Set User Permissions to 1010
//
//   0010
// | 1000
//   ----
//   1010
User.Permissions = SecurityLevel.SuperUser | SecurityLevel.AnswerAdmin;

And then check the permissions in the action being performed:

// Check if the user has the required permission group
//
//   1010
// & 1000
//   ----
//   1000
if( (User.Permissions & SecurityLevel.AnswerAdmin) == SecurityLevel.AnswerAdmin )
{
    // Allowed
}

 

 public class EnumTest    {        [Fact]        public void EnumOR()        {            var mix = TestEnum.apple | TestEnum.orange;            Assert.True((mix & TestEnum.apple) != 0);            Assert.True((3 & 2) != 0);            Assert.True((3 & (int)TestEnum.apple) != 0);            Assert.True((mix & TestEnum.tomato) == 0);            Assert.True((3 & (int)TestEnum.tomato) == 0);            Assert.True(mix.HasFlag(TestEnum.orange));
            Assert.True(mix.ToString()== "apple, orange");            Assert.True((int)mix == 3);        }
        [Flags]        public enum TestEnum        {            apple=1,            orange=2,            potato=4,            tomato=8        }    }