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"

Answer 1

Use like this

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