C# String Interpolation or Curley Brackets

Blog Date 4 June 2021

The Code Behind

using System;

public partial class xxx : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)
        string[] x = { "Andy", "Sarah", "Sally Smith" };
        MyShow.Text = $"Hello {x[0]} and {x[1]} and also {x[2]}";
        MyShow.Text += "<br />";
        MyShow.Text += $"Shorten {x[2]} to {x[2].Substring(0, 5)}";
        MyShow.Text += "<br />";
        MyShow.Text += $"UpperCase {x[1].ToUpper()}";


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="xxx.aspx.cs" Inherits="xxx" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Test Page</title>
    <form id="form1" runat="server">

            <asp:Literal ID="MyShow" runat="server" />


The Explanation

I've come across "Interpolation" before watching a Javascript coder. I wasn't sure if it worked in C# but it does. It's not absolutely necessary, it's one of them "there's many ways to skin a cat" things. 

You can build a string as I've always done like this...

string qwe = "Hello " + Input.Text + " to this website";

...and there's nothing wrong with that at all. Interpolation is just a bit quicker and, depending on your preference, a little easier to read.

string qwe = $"Hello {Input.Text} to this website";

It's also worth noting that you can do all the regular manipulations WITHIN the curly brackets. If you wish to actually print/show some curly brackets these can be escaped by using 2 or them together

string qwe = $"Brackets are escaped thus {{ and }}"

Need a nerd? Contact ren@techsolus.co.uk

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