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c#genericsenumscasting
Michael Zagorski
Michael Zagorski

Reputation: 117

How to cast my own enum type to generic enum type?

How can I cast my own enum type to generic enum type ?

public enum MyEnum
    {
        First,
        Second
    }

    public class MyEnumParser<TEnum>
        where TEnum : struct, Enum
    {
        public static TEnum Parse(string value)
        {
            switch (default(TEnum))
            {
                case MyEnum _: return MyEnum.First;  // Error in this line of code
                default: throw new ArgumentOutOfRangeException($"Type {nameof(TEnum)} not supported.");
            }
        }
    }

The compiler won't let me convert the type, even though I'm explicitly checking the type in the switch:

Cannot implicitly convert type 'ConsoleApp1.MyEnum' to 'TEnum'

If I try to explicitly cast the type, I get another error:

case MyEnum _: return (TEnum)MyEnum.First;

Cannot convert type 'ConsoleApp1.MyEnum' to 'TEnum'

Upd. I am currently working on System.Text.JSON serializer. This is simplified example.The method must be generic. Gradually, I will add all my other enumerations to the serializer. I started with one.

Upvotes: 1

Views: 464

Answers (1)

Iliar Turdushev
Iliar Turdushev

Reputation: 5213

The simplest way to cast your custom enum type MyEnum to generic enum type TEnum is to use the next approach:

case MyEnum _: return (TEnum) (object) MyEnum.First;

Here are links to similar problems:

Upvotes: 1

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