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I have two enums:

public enum Fruits { Apple = 1, Banana = 2, Strawberry = 3, Blueberry = 4 } public enum FruitsCombined { Apple = 1, Banana = 2, Berries = 0 //Strawberry and Blueberry combined }

I have a Combobox, which is bound to the FruitsCombined enum, but in the background, when I select Berries, I want to say it's 3 and 4 from the Fruits enum.

How can I do this?

For example, I want to replace this for a better way, with the two enums:

if ((int)cboFilterFruitType.SelectedValue == 0) { order = order.FindAll(o => o.FruitID == 3 || o.FruitID == 4); } else { order = order.FindAll(o => o.FruitID == (int) cboFilterFruitType.SelectedValue); }
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  • 10
    Use Flags? Commented Oct 10, 2022 at 13:18
  • 3
    You should not use 0 as a value for any meaningful enum value because that's the value of default(TEnum). So you should change Berries = 0 to Berries = 3 - or better-yet: Berries = 7 (because 7 == 3 | 4). Commented Oct 10, 2022 at 13:24
  • Are you using WinForms, WPF, or some other UI framework? Commented Oct 10, 2022 at 13:26
  • I use Winforms. Commented Oct 10, 2022 at 13:29
  • Best way is make enum values a power of 2 : Apple = 1, Banana = 2, Strawberry = 4, Blueberry = 8. Then berries will be 12 (8 + 4). Commented Oct 10, 2022 at 13:38

3 Answers 3

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You can use flags enums:

[Flags] public enum Fruits { Apple = 1, Banana = 2, Strawberry = 4, Blueberry = 8 } public enum FruitsCombined { Apple = 1, Banana = 2, Berries = Fruits.Strawberry | Fruits.Blueberry //Strawberry and Blueberry combined }

Now you can cast one to the other:

FruitsCombined fruitCombined = FruitsCombined.Berries; Fruits fruit = (Fruits)fruitCombined; // Fruits.Strawberry | Fruits.Blueberry

If you want to check if it's a berry you can use Enum.HasFlag:

bool isBerry = fruit.HasFlag(Fruits.Strawberry | Fruits.Blueberry);
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If you have control over both enums you could combine the enums together using flags like suggested in the comments.

[Flags] public enum Fruits { None = 0, Apple = 1, Banana = 2, Strawberry = 4, Blueberry = 8, Berries = Strawberry | Blueberry }

Then if you had code like this

var fruit = Fruits.Berries; Console.WriteLine(fruit.HasFlag(Strawberry)); Console.WriteLine(fruit.HasFlag(Blueberry));

Both write lines would print true.

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as stuartd link says do something more like

change to powers of two

public enum Fruits { Apple = 1, Banana = 2, Strawberry = 4, Blueberry = 8 }

Then you can use bitwise to represent any combo

var appBann = Fruits.Apple | Suits.Banana ;

or Berries = Fruits.Strawberry | Suits.Blueberry

you can even have it as a enum

 public enum Fruits { Apple = 1, Banana = 2, Strawberry = 4, Blueberry = 8, Berries = Strawberry | Blueberry } 
 order = order.FindAll(o => o.FruitID == (int)Fruits.Berries);
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