String concatenation using String interpolation

Question

I've something like below.

var amount = "$1,000.99";
var formattedamount = string.Format("{0}{1}{0}", "\"", amount);

How can I achieve same using String interpolation?

I tried like below

var formattedamount1 = $"\"{amount}\"";

Is there any better way of doing this using string interpolation?

Gilead green, I want wrap in quotes so that amount will not populate in multiple cells in CSV file. — Prasad Kanaparthi
– Prasad Kanaparthi, Commented Jun 1, 2018 at 5:32
@PrasadKanaparthi that what you have in your first example, will not even compile. — SᴇM
– SᴇM, Commented Jun 1, 2018 at 5:34

TheGeneral · Accepted Answer · 2018-06-01 05:52:58Z

2

Update

Is there any better way of doing this using string interpolation

No, this is just string interpolation, you cant make the following any shorter and more readable really

var formattedamount1 = $"\"{amount}\"";

Original answer

$ - string interpolation (C# Reference)

To include a brace, "{" or "}", in the text produced by an interpolated string, use two braces, "{{" or "}}". For more information, see Escaping Braces.

Quotes are just escaped as normal

Example

string name = "Horace";
int age = 34;

Console.WriteLine($"He asked, \"Is your name {name}?\", but didn't wait for a reply :-{{");
Console.WriteLine($"{name} is {age} year{(age == 1 ? "" : "s")} old.");

Output

He asked, "Is your name Horace?", but didn't wait for a reply :-{
Horace is 34 years old.

edited Jun 1, 2018 at 5:52

answered Jun 1, 2018 at 5:36

TheGeneral

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9 Comments

TheGeneral Over a year ago

@GiladGreen there definitely was some confusion going on there though

Prasad Kanaparthi Over a year ago

@TheGeneral, what was the confusion.

TheGeneral Over a year ago

@PrasadKanaparthi var formattedamount1 = $"{"\""{amount}{"\""}"; this line

SᴇM Over a year ago

@TheGeneral and this line - "How can I achieve same using String interpolation?"

TheGeneral Over a year ago

@PrasadKanaparthi the question is why

|

SᴇM · Accepted Answer · 2018-06-01 05:43:30Z

1

Same thing you can achieve by doing:

var formattedamount1 = $"\"{amount}\"";

OR

var formattedamount1 = $@"""{amount}""";

It's basically allowing you to write string.Format(), but instead of using one string with "placeholders"({0}, {1}, .. {N}), you are directly writing/using your variable inside string.

Please read more about String Interpolation (DotNetPerls), $ - string interpolation to fully understand whats going on.

edited Jun 1, 2018 at 5:43

answered Jun 1, 2018 at 5:35

SᴇM

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Comments

Jon Skeet · Accepted Answer · 2018-06-01 07:44:20Z

1

Just to give one more option, if you want to make sure you use the same quote at both the start and the end, you could use a separate variable for that:

string quote = "\"";
string amount = "$1,000.99";
string formattedAmount = $"{quote}{amount}{quote}";

I'm not sure I'd bother with that personally, but it's another option to consider.

answered Jun 1, 2018 at 7:44

Jon Skeet

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