c# - What's a good way of doing string templating in .NET?

Question

I need to send email notifications to users and I need to allow the admin to provide a template for the message body (and possibly headers, too).

I'd like something like string.Format that allows me to give named replacement strings, so the template can look like this:

Dear {User},

Your job finished at {FinishTime} and your file is available for download at {FileURL}.

Regards,

-- 
{Signature}

What's the simplest way for me to do that?

Answer 1

Here is the version for those of you who can use a new version of C#:

// add $ at start to mark string as template
var template = $"Your job finished at {FinishTime} and your file is available for download at {FileURL}."

In a line - this is now a fully supported language feature (string interpolation).