Question

How to use enum datatype in interface?

Is this possible?

public interface IParent1
{
    string method1(Test enum);
}

public class Parent1 : IParent1
{
    public enum Test 
    {
        A, 
        B, 
        C
    }

    public string method1(Test enum)
    {
        return enum.ToString();
    }
}

Answer 1

enum is a reserved keyword in C#. You can prefix it with @ if you want to use it as variable name:

public enum Test { A, B, C };

public interface IParent1
{
    string method1(Test @enum);
}

public class Parent1 : IParent1
{
    public string method1(Test @enum)
    {
        return @enum.ToString();
    }
}

But I don’t like using reserved words for variable names. A better approach would be:

public enum Test { A, B, C };

public interface IParent1
{
    string method1(Test test);
}

public class Parent1 : IParent1
{
    public string method1(Test test)
    {
        return test.ToString();
    }
}