Ternary Operator Error

Question

I want to convert this if, else-if, can someone help me out please?

if (condition1)
    response.Redirect(" some link");
else if (condition2)
    response.Redirect("link 2");

I want convert above statement,but showing error at the end, required ":". Any other way i can use this?

LinkPurchase.PostBackUrl =((Condition)?string.Format("some link"):  
                        (condition2)?string.Format("link 2));

"I want to convert the Conditional Code to ternary". Trust me, no you don't. — Kyle, Jul 31 '14 at 15:05
I'd write this as an answer, but new answers are locked... `var redirect = condition1 ? "some link" : (condition2 ? "link2") : null; if(redirect!=null)response.Redirect(redirect);` — dss539, Jul 31 '14 at 15:20
@dss539 That could be made to work! However the `()` inside your first expression are misplaced. — Jeppe Stig Nielsen, Jul 31 '14 at 15:33
@JeppeStigNielsen thanks, unfortunately I can't edit the comment for some reason — dss539, Jul 31 '14 at 16:07
Guys thanks for your comments, i found the solution. It was simple, i added ":null" at the end. — user3846077, Jul 31 '14 at 16:36

score 0 · Answer 1 · answered Jul 31 '14 at 15:03

0

You cannot rewrite that to the ?: operator.

You have an if-else if, not just an if-else.

Besides, you do not pick up the return values from the Redirect calls.

The usual case where you do want to rewrite to the ?: operator is:

if (condition)
  something = Abc();
else
  something = Xyz();

where it is natural to use instead:

something = condition ? Abc() : Xyz();

answered Jul 31 '14 at 15:03

He *could*. It almost certainly wouldn't be a good idea, but it's absolutely possible. – Servy Jul 31 '14 at 15:07
@Servy I wonder how? Are you going to answer something like `(condition1 ? () => response.Redirect(" some link") : condition2 ? () => response.Redirect("link 2") : (Action)(() => { }))();` (I made it!)? – Jeppe Stig Nielsen Jul 31 '14 at 15:23
That's certainly one way, yes. Not the only way of course, but you've now successfully proved your own answer wrong. – Servy Jul 31 '14 at 15:24
@Servy Nothing can prove a perfect answer wrong, not even the comments of its own author. – Jeppe Stig Nielsen Jul 31 '14 at 15:31
I'll be sure to test that theory out when I actually find a perfect answer. – Servy Jul 31 '14 at 15:33

score 0 · Answer 2 · answered Jul 31 '14 at 15:07

You cannot do this.

There are other answers here that inform you that the ?: operator needs the "else" part, so yes, the first problem is that you're missing that.

However, Response.Redirect doesn't return anything, so you cannot do this even with the else part.

?: is an expression, you cannot write statements (easily) with this.

Stick with the if-statements.

2 Answers2