本系统来源于实际应用的图书馆管理系统，宗旨是通过本实例，能够将前面所学知识，综合应用到实际编程实践中，提升编程能力，加深对C#这门编程语言的理解和认识。-Practical application of this system comes from the library management system, the aim is through this example, the ability to previously learned knowledge, and comprehensiv