Formating strings in C#, like in Python

I like Python’s way to format strings because you can use it everywhere, it’s part of the strings. You can do

print("Welcome %s!" % user.name)

as you can do

Console.Writeln("Welcome {0}!", user.Name)

But then in Python you can also do

randomMethodThatTakesAString("Welcome %s!" % user.name)

In C# it gets trickier, because the call to Console.Writeln takes extra arguments for the string arguments, while RandomMethodThatTakesAString doesn’t. It just takes a string. So the only way to go is

RandomMethodThatTakesAString(String.Format("Welcome {0}!", user.Name))

which is ugly.

Thanfully C# 3.0 has extension methods, so I quickly wrote this method:

blah blah

and now I can write:

RandomMethodThatTakesAString("Welcome {0}".Args(user.Name))

which is more verbose that Python’s version, but equally nice in my eyes.

If you can understand why allowing the language to be extendable in one aspect was a win here, then you can understand why so many, me included, love Lisp that is extendable in every possible way.

Reviewed by Daniel Magliola. Thank you!

Update 2009-09-17: For those complaining that I didn’t show how I did it, here is the Args method:

public static class StringExtensions {
    public static string Args(this string str, params object[] args) {
        return String.Format(str, args);
    }
}

You may also like:


Leave a Reply

Hi, I'm Pablo, this is my web site. You can follow me or connect with me:

Or get new content delivered directly to your inbox.

Join 4,025 other subscribers

I'm writing a book

Stack of copies of How to Hire and Manage Remote Teams

How to Hire and Manage Remote Teams, where I distill all the techniques I've been using to build and manage distributed teams for the past 10 years.

I write about:

announcement blogging book book review book reviews books building Sano Business C# Clojure ClojureScript Common Lisp database Debian Esperanto Git history idea Java Kubuntu Lisp music Non-Fiction OpenID programming Python Rails rant re-frame release Ruby Ruby on Rails Sano science science fiction security self-help Star Trek startups technology Ubuntu video web Windows WordPress

I've been writing for a while:

%d bloggers like this: