C# interpolated string with conditional-operator [duplicate]

Question

I tried to use the conditional operator inside an interpolated string, but because it has a colon in it, the compiler thinks that after the colon comes a format string.

$"test {foo ? "foo is true" : "foo is false"}";

How can I use this type of statement? The only thing that comes to my mind is something like this:

var fooString = foo ? "foo is true" : "foo is false";
$"test {fooString}";

That's an Interpolated string. Verbatim strings are those that start with @" and may contain characters that would normally need escaping. — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented Nov 2, 2015 at 8:58

Tomáš Hübelbauer · Accepted Answer · 2015-11-02 08:50:23Z

222

You need to put the string in parentheses within {}, so: {(1 == 1 ? "yes" : "no")}.

answered Nov 2, 2015 at 8:50

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Tomáš Hübelbauer

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bornfromanegg · Accepted Answer · 2019-02-13 10:52:26Z

51

$"test {(foo ? "foo is true" : "foo is false")}";

The code inside the parentheses returns a variable, and that's the only thing allowed inside the curly brackets. The colon ':' is a special character in string interpolation, hence it needs to be parenthesised.

edited Feb 13, 2019 at 10:52

bornfromanegg

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answered Nov 2, 2015 at 8:49

GregoryHouseMD

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