C＃条件运算符-这怎么了？

Question

I cannot figure out what I'm doing wrong for the life of me. I've been using ?: throughout the life of my project but all of a sudden I keep being told "Only assignment, call, increment, decrement and new object expressions can be used" yet if I copy and paste the exact same thing into another file.. I get no error like that.

true ? "1" : "1"; should be the most basic statement that works, correct? I mean it already does elsewhere so what could I be not understanding?

Answer 1

When you say you are using conditional operator elsewhere & it is working fine perhaps you are using it in a way different than the screen capture you have shared. I say this because C# won't allow you to do it in the way you mentioned: ie

true ? "1" : "1";

Think of it this way: Conditional operator is in essence an if-else.

if (true)
    "1"; //does not make sense, it appears to be string but the compiler needs to know what this is exactly
else
    "1"; //same comment as above

To summarize you need to assign that string "1" to a variable & then things would work fine.

string str = true ? "1" : "1";