检测构造函数中的执行 [英] Detect Execution in Constructor
问题描述
我有一个受保护的方法，我只希望从
构造函数中的代码或构造函数调用的方法调用它。如果它没有直接或间接地从构造函数调用
，我想抛出一个异常。无论如何要实现这个吗？
提前致谢！
< blockquote>创建只读私人bpp;班上的eam成员。初始化
为true：
private readonly bool _inConstructor = true;
当你的构造函数完成运行时，设置为false：
this._inConstructor = false;
由于只能在构造函数中设置只读成员而且无处可用/>
else，你保证如果_inConstructor为true，你就会运行
构造函数。
嗯...想一想，它运行正常，直到你运行一个子类的
构造函数，此时_inConstructor将是
错误。
为了使这个工作也适用于子课程，你必须使
_inConstructor受到保护，并且在每个子课程开始时
构造函数，说：
this._inConstructor = true;
然后
this._inConstructor = false;
结尾。
不是ver令人满意的解决方案，但是唯一的其他解决方案
走栈（哎呀！）？任何人？
Gniluy写道：
我有一个受保护的方法，我只想从中调用它
构造函数中的代码或构造函数调用的方法中的代码。如果没有直接或间接地从构造函数调用它，我想抛出一个异常。无论如何都要实现这个吗？
除了其他回复之外，我还想提到那些调用
虚拟来自构造函数的代码被许多人视为非常危险的b
实践。尝试谷歌搜索呼叫虚拟构造函数，它会找到你关于这个主题的很多信息。
奥利弗斯特姆
-
omnibus ex nihibo ducendis sufficit unum
插入空格以防止谷歌电子邮件销毁：
MSN oliver @ sturmnet.org Jabber sturm @ amessage.de
ICQ 27142619 http：//www.sturmnet .org / blog
Hi,
I have a protected method that I only want it to be called from code in
constructor or from methods called by constructor. If it is not called
directly or indirectly from constructor, I want to throw an exception. Is
there anyway to implement this?
Thanks in advance!
Create a "readonly" private bpp;eam member in your class. Initialize it
to true:
private readonly bool _inConstructor = true;
When your constructor finishes running, set it to false:
this._inConstructor = false;
Since a readonly member can be set only in a constructor and nowhere
else, you''re guaranteed that if _inConstructor is true, you''re running
the constructor.
Hmm... thinking this over, it works fine until you''re running the
constructor of a child class, at which point _inConstructor will be
false.
To make this work for child classes, too, you would have to make
_inConstructor protected, and at the start of every child class
constructor, say:
this._inConstructor = true;
and then
this._inConstructor = false;
at the end.
Not a very satisfactory solution, but is the only other solution to
walk the stack (yuck!)? Anyone?
Gniluy wrote:
I have a protected method that I only want it to be called from code in
constructor or from methods called by constructor. If it is not called
directly or indirectly from constructor, I want to throw an exception. Is
there anyway to implement this?
In addition to the other replies, I wanted to mention that calls into
virtual code from constructors are regarded by many as a very dangerous
practice. Try googling for "call virtual constructor", that''ll find you
a lot of information on the topic.
Oliver Sturm
--
omnibus ex nihilo ducendis sufficit unum
Spaces inserted to prevent google email destruction:
MSN oliver @ sturmnet.org Jabber sturm @ amessage.de
ICQ 27142619 http://www.sturmnet.org/blog
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