IComparable implies, that two object can be compared in a sense, that you can tell which object has "higher value". It is generally used for sorting purposes. You should override Equals
method instead .You should also use Point struct instead of array.
class Shape : IEquatable<Shape>
{
public Point coordinate { get; set; }
public bool Equals(Shape other)
{
if (other == null) return false;
return coordinate.Equals(other.coordinate);
}
public override bool Equals(object other)
{
if (other == null) return false;
if (ReferenceEquals(this, other)) return true;
var shape = other as Shape;
return Equals(shape);
}
public override int GetHashCode()
{
return coordinate.GetHashCode()
}
}