Skip to content

Instantly share code, notes, and snippets.

What would you like to do?
.FormatWith() extension method that we use with some of our Umbraco sites
using System;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
namespace MyUmbracoSite.Core.Extensions
public static class StringExtensions
public static string FormatWith(this string format, params object[] args)
if (format == String.Empty) return format;
args = args ?? new object[0];
string result;
var numberedTemplateCount = (from object match in new Regex(@"\{\d{1,2}\}").Matches(format) select match.ToString()).Distinct().Count();
if (numberedTemplateCount != args.Length)
var argsDictionary = args[0].ToDictionary();
if (!argsDictionary.Any())
throw new InvalidOperationException("Please supply enough args for the numbered templates or use an anonymous object to identify the templates by name.");
result = argsDictionary.Aggregate(format, (current, o) => current.Replace("{" + o.Key + "}", (o.Value ?? string.Empty).ToString()));
result = string.Format(format, args);
if (result == format && result.Contains("{"))
throw new InvalidOperationException("You cannot mix template types. Use numbered templates or named ones with an anonymous object.");
return result;

This comment has been minimized.

Copy link
Owner Author

@ryanlewis ryanlewis commented Aug 31, 2016

"This string is {foo}".FormatWith(new { foo = "bar" };
// returns "This string is bar"
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.