描述 C# 语言的基本特征。尽管后面的章节会更为详尽，有时甚至逻辑缜密地对规则和例外情况进行描述，但本章的描述力求简洁明了，因而难免会牺牲完整性。这样做是为了向读者提供关于该语言的概貌，一方面使读者能尽快上手编写程序，另一方面为阅读后续章节提供指导。-Describe the basic features of the C# language. Despite the later chapters will be more detailed, and sometimes mathematical manner, rules and exceptions described, but the descr iption of this chapter concise and clear, and thus inevitably sacrifice integrity. This is done to provide the reader with an overview about the language, on the one hand so that readers can get started as soon as possible to write programs, on the other hand to provide guidance for reading the subsequent chapters.