Because such initialization occurs only once , when the class constructor executes , and therefore affects only one thread 的字段指定初始值,因为这样的初始化只会发生一次,因此在类构造函数执行时只会影响一个线程。
A link demand performed on a static class constructor does not protect the constructor because static constructors are called by the system , outside the application s code execution path 对静态类构造函数执行的链接要求不会保护该构造函数,因为静态构造函数是由系统调用的,它们并不包括在应用程序的代码执行路径中。