当实例构造函数没有构造函数初始化器或有一个形式为 base(?) 的构造函数初始化器时，该构造函数会隐式执行其类中声明的实例字段的变量初始化器所指定的初始化。这对应于一系列赋值操作，这些操作在进入构造函数时立即执行，并在隐式调用直接基类构造函数之前完成。变量初始化器按它们在类声明中出现的文本顺序执行。
When an instance constructor has no constructor initializer, or it has a
constructor initializer of the form
base(?), that constructor implicitly performs the initializations specified
by the variable-initializers of the
instance fields declared in its class. This corresponds to a sequence of
assignments that are executed immediately
upon entry to the constructor and before the implicit invocation of the
direct base class constructor. The variable
initializers are executed in the textual order in which they appear in the
class declaration.
constructor initializer of the form
base(?), that constructor implicitly performs the initializations specified
by the variable-initializers of the
instance fields declared in its class. This corresponds to a sequence of
assignments that are executed immediately
upon entry to the constructor and before the implicit invocation of the
direct base class constructor. The variable
initializers are executed in the textual order in which they appear in the
class declaration.
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