What is the question mark operator mean in C#?

This question already has an answer here:

Null Conditional Operators 2 answers

---

This is the null conditional operator:

Used to test for null before performing a member access (?.) or index (?[) operation.

You method's code without the use of null conditional operator it could be written as below:

public void DoSomething(Result result)
{
    if(result!=null)
    {
        if(result.Actions!=null)
        {
            return result.Actions.Utterance;
        }
        else
        {
            return null;
        }
    }
    else
    {
        return null;
    }

}

---

该运算符是空条件if语句的简写形式：

public void DoSomething(Result result)
{
    if(result != null){
        if(result.Actions != null){
            return result.Actions.Utterance;
        }
    }
    return null;
}

链接地址: http://www.djcxy.com/p/9124.html

上一篇: 继承自List <T>

下一篇: C＃中问号运算符的含义是什么？