How to use string interpolation with CultureInfo?

Question

I'm doing some testing around formatting in c#, and want to do some string interpolation while also using US CultureInfo (System.Globalization). Without string interpolation this code gives me the correct date format:

DateTime date = new DateTime(2013, 4, 22);

CultureInfo provider = new CultureInfo("en-US");

Console.WriteLine("Choosen date is: " + date.ToString("d", provider));

This will display the date on US format: Choosen date is: 4/22/2013

How can I do this when using string interpolation? Here are one of my failed attempts, using String.Format:

CultureInfo provider = new CultureInfo("en-US");

Console.WriteLine(String.Format(provider, $"Choosen date is: {date:d}"));

This displays the date in my local format: Choosen date is: 22.04.2013

Any suggestions will be much appreciated.

Answer 1

Use FormattableString.

Console.WriteLine(
    ((FormattableString)$"Choosen date is: {date:d}")
      .ToString(provider)
);

Tor's answer is simpler than this, unless you have multiple variables in interpolation string. FormattableString allows do multiple formats all in one shot.

here is a C# 10's way, from aepot below.

string.Create(provider, $"Choosen date is: {date:d}")

Answer 2

You can just do: Console.WriteLine($"Choosen date is: {date.ToString("d", provider)}"));

Just format the date the same way as the string format inside the square brackets .