Clever Geek Handbook

Initialize my class with array syntax

Do I need to initialize my class as an array or a dictionary like

    private class A
    {
        private List<int> _evenList;
        private List<int> _oddList;
        ...
    }

and tell

A a = new A {1, 4, 67, 2, 4, 7, 56};

and in my constructor fill in _ evenList and _ oddList with your values.

+3


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2 answers


To use a collection initializer , your class must:

  • Implement IEnumerable

  • Implement appropriate methods Add



For example:

class A : IEnumerable
{
    private List<int> _evenList = new List<int>();
    private List<int> _oddList = new List<int>();

    public void Add(int value)
    {
        List<int> list = (value & 1) == 0 ? _evenList : _oddList;
        list.Add(value);
    }

    // Explicit interface implementation to discourage calling it.
    // Alternatively, actually implement it (and IEnumerable<int>)
    // in some fashion.
    IEnumerator IEnumerable.GetEnumerator()
    {
        throw new NotImplementedException("Not really enumerable...");
    }
}
+6




The only way I can think of is to pass the array through the constructor

private class A
{
    private List<int> _evenList;
    private List<int> _oddList;

    public A (int[] input)
    {
        ... put code here to load lists ...
    }
}


Using:

A foo = new A({1, 4, 67, 2, 4, 7, 56});
0








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