Backporting C# interpolated string operator $

Question

I have some code I want to reuse in older versions of c#

List<string> programId = new List<string>(){"1","2","3"}
string.Join(",", Id.Select(x => $"'{x}'"))

How would $ operator be translated to older version of C# ?

@Tim: Even if you select .NET 2 in VS2015 and use it, the C# 6 compiler will compile compatible code. — leppie
– leppie, Commented Jul 18, 2016 at 20:11
@Tim: Mostly, for newer .NET, IFormattable could come into play (but I have not really seen this in practice) Edit: Oops, it could be some other interface I dont recall now :D — leppie
– leppie, Commented Jul 18, 2016 at 20:13

Robert Harvey · Accepted Answer · 2016-07-18 20:06:22Z

10

$"'{x}'"

translates to

string.Format("'{0}'", x)

in older versions of C#.

In fact, the String Interpolation version is just compiler syntactic sugar. If you decompile the resulting assembly, you'll find out it all resolves to string.Format calls.

answered Jul 18, 2016 at 20:06

Robert Harvey

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4 Comments

Uwe Keim Over a year ago

I do think, ReSharper can forward and backward translate between $ interpolation and string.Format.

Robert Harvey Over a year ago

It can. At my current job we use CSScript, which doesn't do string interpolation, so I'm always ignoring Resharper's helpful suggestions to convert to string interpolation.

Uwe Keim Over a year ago

I do love CSScript and use it all the time for all my setup build and deploy scripts! Oleg does an awesome work and support.

Mafii Over a year ago

@RobertHarvey I dont know much about CSScript, but you could always set the c# language level to a lower one, so It doesnt suggest interpolation

Jared Lovin · Accepted Answer · 2016-07-18 20:05:35Z

4

How about this?

string.Join(",", Id.Select(x => string.Format("'{0}'", x)))

answered Jul 18, 2016 at 20:05

Jared Lovin

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