How do I use string interpolation with string literals?

Question

I'm trying to do something like

string heading = $"Weight in {imperial?"lbs":"kg"}"

Is this doable somehow?

Roman · Accepted Answer · 2025-02-14 13:02:05Z

29

You should add () because : is also used for string formatting:

string heading = $"Weight in {(imperial ? "lbs" : "kg")}";

edited Feb 14 at 13:02

answered Feb 27, 2017 at 18:50

Roman

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Thomas Weller · Accepted Answer · 2017-02-27 19:02:19Z

15

Interpolated strings can contain formatting definitions which are separated from the variable name by colons.

string formatted = $"{foo:c5}"; // 5 decimal places

Since the conditional operator (?:) also uses a colon, you have to use braces to make it clear for the compiler that you don't want a format specifier:

string heading = $"Weight in {(imperial?"lbs":"kg")}";

answered Feb 27, 2017 at 19:02

Thomas Weller

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2 Comments

Dmitrii Bychenko Over a year ago

Right an precise explanation, +1

Volker Over a year ago

Now I understand. Thanks!

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