Gets the single T of this instance.
public bool TryGetSingle<T>(out T command)
where T : DefaultUnDo.IUnDo;T
command T
When this method returns, the single T of this instance, if it was its only command; otherwise, the default value for the type T.
This parameter is passed uninitialized.
System.Boolean
true if the current instance contains exactly one T; otherwise false.