Implementing interfaces in C# Unity - am I missing something?

Questions & Answers
1

I must be missing something obvious, I cant seem to implement the IEquatable interface in MonoDevelop and Unity…

The error I am getting is:

The type or namespace name IEquatable1’ could not be found. Are you missing a using directive or an assembly reference?

Here is the start of the class…

using UnityEngine;
using System.Collections.Generic;

public class Item : IEquatable<Item>
{	
	private string _name;
	private int _cost;
	private RarityTypes _rarity;
	private Texture2D _icon;
	
	public override int  GetHashCode()
	{
    return this.Item.GetHashCode();
	}

	public override bool Equals(object obj)
	{
	    Item item = obj as Item;
	    if (item != null)
	    {
	        return Equals(item);
	    }
		
	    else
	    {
	        return false;
	    }
	}
2

using System;

3

You may need to specify the namespace for IEquatable<​T​> in Unity:

public class Item : System.IEquatable<Item>
{
    ...

Also make sure you actually implement the interface…

public bool Equals(Item item)
{
    ...
}