如何确定对象引用是否为空? [英] How to determine whether object reference is null?

问题描述

确定对象引用变量是否为null的最佳方法是什么?

What is the best way to determine whether an object reference variable is null?

是下面的吗?

MyObject myObjVar = null;
if (myObjVar == null)
{
    // do stuff
}

推荐答案

是的，是的，如果您要执行任意代码，可以使用以下代码段:

Yes, you are right, the following snippet is the way to go if you want to execute arbitrary code:

MyObject myObjVar; 
if (myObjVar == null) 
{ 
    // do stuff 
} 

顺便说一句:您的代码无法像现在那样编译，因为myObjVar在初始化之前就已被访问.

BTW: Your code wouldn't compile the way it is now, because myObjVar is accessed before it is being initialized.

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