private static Int32 EnsureValue(GroupCountUpDown item)
{
var value = item.Value;
if (!value.HasValue)
{
throw new NotSupportedException(); // <Null> values not allowed.
}
return(value.Value);
}
public void AddChild(GroupCountUpDown item)
{
if (Object.ReferenceEquals(item, null))
{
throw new ArgumentNullException(nameof(item));
}
item.IsCoupled = false;
this.children.Add(item);
this.InvalidateConstraint();
}
public Boolean RemoveChild(GroupCountUpDown item)
{
if (Object.ReferenceEquals(item, null))
{
throw new ArgumentNullException(nameof(item));
}
if (!this.children.Remove(item))
{
return(false);
}
this.InvalidateConstraint();
return(true);
}
