级联空引用异常检查? [英] Cascading null reference exception check?

问题描述

有没有一种方法可以在C#中进行一般的级联空引用检查?

Is there a way to do a generic cascading null reference check in c#?

我要实现的目标是，如果我尝试访问属于类C的字符串变量，而该类又是类B的一部分，而类B是A的类.

What i am trying to achieve is if i am trying to access a string variable which is part of a class C, which is inturn in class B, which is in A.

A.B.C.str

A.B.C.str

我通过了A，因此我必须检查A是否为空，然后检查B是否为空，然后检查C是否为空，然后访问str.

And that i am passed in A, i will have to check to see if A is null, then check if B is null, then check is C is null and then access str.

是否可以使用某些方法-我们可以传入A和A.B.C.str，如果一切正确存在，则返回null表示任何为null或str的值.

Is it possible to have some method where - we can potentially pass in, A and A.B.C.str and it return null is anything was null or value of str if everything existed correctly.

推荐答案

目前尚无内置方法可以执行此操作，但是在C#6.0中，我们希望使用安全导航"操作符，请参见杰里·尼克松(Jerry Nixon)的帖子

There is no built in way to do this yet, however in C# 6.0 we are expecting a 'safe navigation' operator, see this post by Jerry Nixon

它看起来像这样:

var g1 = parent?.child?.child?.child; 
if (g1 != null) // TODO

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