Question

I have situation like this:

got enum

enum MyType{
    None = 0,
    First = 1,
    Second = 2,
    Third = 4,
    //and so on 
}

now I wan’t to check if given number is result of the sum of the binary for example

int givenNumber = 3;
int result = 
//how to get that it's sum of 2 enums in this particular case would be (int)Type.First & (int)Type.Second == 3;

Hope that my question is clear enough and someone can help with this.

Edit

1. enum values are always powered by 2

2. I want to write a method which should check that given number can be one pice of different binary sum example:int givenNumber = 1; //1 , 3 ,5 and 7 will be the answer

3. Real life sample:
   I got contractors in my db and every contractor can be Producer = 1,Supplier = 2,Service = 4 in db I can store only 1 value int in this case would be smartest choice. When I loading Items to my combobox of Service – Contractors I want load every row which have for example value 4 or 5 or 7 (beacuse 7 = 1+2+4, 5 = 1+4 and 4=4).

Is now my question more clear?

Answer 1

You can get the individual enums like this:

static IEnumerable<MyEnum> GetFlags(this MyEnum e)
{
    var flags = Enum.GetValues(typeof(MyEnum)).Cast<MyEnum>();
    foreach (var flag in flags)
        if ((flag & e) > 0) yield return flag;
}

then you can use it like this:

int givenNumber = 3;
var results = ((MyEnum)givenNumber).GetFlags();