/// <summary>
/// Gets or adds a new <see cref="CogitoControl"/> to the <see cref="ControlCollection"/>.
/// </summary>
/// <typeparam name="TControl"></typeparam>
/// <param name="controls"></param>
/// <returns></returns>
public static TControl GetOrAdd <TControl>(this ControlCollection controls)
where TControl : Control, new()
{
if (controls == null)
{
throw new ArgumentNullException(nameof(controls));
}
return(controls.GetOrAdd(() => new TControl()));
}
/// <summary>
/// Gets or adds a <see cref="Control"/> to the <see cref="ControlCollection"/>.
/// </summary>
/// <typeparam name="TControl"></typeparam>
/// <param name="controls"></param>
/// <param name="create"></param>
/// <returns></returns>
public static TControl GetOrAdd <TControl>(this ControlCollection controls, Func <TControl> create)
where TControl : Control
{
if (controls == null)
{
throw new ArgumentNullException(nameof(controls));
}
if (create == null)
{
throw new ArgumentNullException(nameof(create));
}
return(controls.GetOrAdd <TControl>(_ => true, create));
}