是否有一个原因的NullReferenceException不给变量的名称？ [英] Is there a reason why NullReferenceException does not give the name of the variable?

问题描述

在 ArgumentNullException 有一个 PARAMNAME 属性，以指示哪个参数传递为空。

The ArgumentNullException has a ParamName property to indicate which argument was passed as null.

为什么在的NullReferenceException 再有类似的性质？难道一直技术上是可行的在.NET来实现？

Why does the NullReferenceException not have a similar property? Would it have been technically possible to implement within .Net?

推荐答案

A 的NullReferenceException 由CLR抛出时它会尝试浏览一个空引用。这不一定与变量相关联，并且特别在CLR确实不在乎是从哪里来的 - 这是在堆栈上仅有一个值

A NullReferenceException is thrown by the CLR when it tries to navigate a null reference. This isn't necessarily associated with a variable, and in particular the CLR really doesn't care where it came from - it's just a value on the stack.

相比之下，与 ArgumentNullException 是明确的通过code抛出，如：

Compare that with ArgumentNullException which is explicitly thrown via code such as:

if (foo == null)
{
    throw new ArgumentNullException("foo");
}

没有什么神奇这里 - 你甚至可以给错了名字，如果你想。因此，他们已经非常不同的情况。

There's no magic here - and you can even give the wrong name if you want. So they're really very different situations.

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