C # Use of using references and aliases,

C # Use of using references and aliases,

1. Use aliases

When the two namespaces referenced at the same time have the same type, aliases can be used to differentiate them. As follows:
Using System;
Using System. Threading;
Using System. Timers;
The second and third introduced namespaces have the same Timer name, so you can use using CountDownTimer = System. Timers. Timer; To create an alias for one of them to avoid duplicate names. You can also set the alias to Timer.
Using Timer = System. Timers. Timer;
Class HelloWorld
{Static void Main ()
{Timer timer ;}}
Currently, there is no ambiguity when Timer is used. If you reference the System. Threading. Timer class again, you must define or define different aliases.