C# String Interpolation and the Conditional Operator

Question

How I can return null in the string if my {condition} is false. I'm using string interpolation with the conditional operator.

string returnURL = $"{ condition ? (ConfigurationManager.AppSettings["ApplicationURL"]}/my-page/{trip?.TripUId }) : null"

It's unclear to me what you're trying to achieve. Do you want `returnURL` itself to be null if `condition` is false? A [mcve] with sample input and output would make it much easier to help you. — Jon Skeet, Jun 16 '20 at 13:11
(I suspect you should just use the conditional operator *outside* the interpolated string literal: `string returnUrl = condition ? $"{ConfigurationManager.AppSettings["ApplicationURL"]}/my-page{trip?.TripUid}" : null;` — Jon Skeet, Jun 16 '20 at 13:12

score 1 · Accepted Answer · answered Jun 16 '20 at 13:15

1

Use like this

bool flag = true;
string returnUrl = flag ? $"{ConfigurationManager.AppSettings["ApplicationURL"]}/my-page{trip?.TripUid}" : null;

answered Jun 16 '20 at 13:15

Vivek Nuna

1 Answers1