/// <summary>
/// Adds the line.
/// </summary>
/// <param name="line">The line.</param>
public void AddLine(IOrderLine <IProduct> line)
{
ErrorBase.CheckArgIsNull(line, nameof(line),
nameof(line).GetArgumentNullErrorMessage(nameof(AddLine)));
//Hp --> Note: Here interface IOrderLine is covariant of type IProduct.
//Which means user is allowed to add any concreate class object which impelements IProduct.
lines.Add(line);
}
/// <summary>
/// Removes the line.
/// </summary>
/// <param name="line">The line.</param>
public void RemoveLine(IOrderLine <IProduct> line)
{
ErrorBase.CheckArgIsNull(line, nameof(line),
nameof(line).GetArgumentNullErrorMessage(nameof(RemoveLine)));
var comparer = Utility.GetEqualityComparer <IOrderLine <IProduct> >();
if (lines.Contains(line, comparer))
{
lines.RemoveAll(L => L.Id == line.Id);
}
}
