How to instantiate a linkedlistNode of a generic type in c#-CodePudding

For example I have a generic class KeyAndValue

public class KeyAndValue<T, U>
{
    public T? key { get; set; }
    public U? value { get; set; }
}

Now I want to instantiate a LinkedListNode<KeyAndValue<int, int>> object

var newNode = new LinkedListNode<KeyAndValue<int, int>>();

I received warning like this

There is no argument given that corresponds to the required formal parameter 'value' of 'LinkedListNode<KeyAndValue<int, int>>.LinkedListNode(KeyAndValue<int, int>)' [146]",

My question is how to create an object that is generic type of generic type?

CodePudding user response：

You can use the existing class KeyValuePair instead of KeyAndValue. Additional you can create a constructor:

public class KeyAndValue<T, U>
    {
        public KeyAndValue(T key, U value)
        {
            this.key = key;
            this.value = value;
        }
        public T? key { get; set; }
        public U? value { get; set; }
    }

Both is possible:

var keyValuePair = new KeyValuePair<int, int>(0, 5);
var linkedListNode1 = new LinkedListNode<KeyValuePair<int, int>>(keyValuePair);

var keyAndValue = new KeyAndValue<int, int>(0, 5);
var linkedListNode2 = new LinkedListNode<KeyAndValue<int, int>>(keyAndValue);