Do C # enum flags needed

Question

In C #, should enum flags be sequential? or can you leave spaces? and still do bitwise comparisons? those. can you do the following:

[Flags] public enum MyEnum { None = 0, IsStarred = 1, IsDone = 128 } 

Answer 1

There is nothing wrong with the code you posted. This is absolutely normal:

 [Flags] public enum MyEnum { None = 0, IsStarred = 1, IsDone = 128 } 

And like this:

 [Flags] public enum MyEnum { IsStarred = 1, IsDone = 128 None = 0, SomethingElse = 4, } 

Just remember that FlagsAttribute does not apply your values ​​as bit masks.

Answer 2

There is nothing that would require them to be consistent.

Your listing definition is beautiful and will compile without problems.

The problem of readability and the principle of least surprise, however, were significantly compromised ...

Answer 3

There is no such requirement. You are fine if you use [Flags] .

Answer 4

They do not have to be consistent.

Answer 5

Yes you can do it. It depends on you.

Answer 6

No, they do not have to be consistent. Compile your code and see for yourself.

Answer 7

You can not only do this, but also do this:

 public enum MyEnum { None, IsStarred, IsDone = 128 } 

or

 public enum MyEnum { None = 5, IsStarred, IsDone = 128 } 

here is a link to other examples: http://www.dotnetperls.com/enum

Answer 8

Reference enumerations must not have the Flags attribute. But this is the best practice. You can read here: http://msdn.microsoft.com/en-us/library/ms229062.aspx