C#微信飞机大战，这个版本改成面向对象的了，并且加入了工厂模式。代码完全模拟微信飞机大战。功能效果基本全部实现。-C# micro-channel aircraft war, this version into the object-oriented, and joined the factory pattern. Code is fully simulated micro letter airplane war. Functional effects basically fully achie