Every now and again, there is a need to produce a list in a random order. 

I've found a very reliable way to do this using linq and the Guid class.

It might sound complicated, but when you see the example, it should make sense and you should see how simple it is.

using System;
using System.Collections.Generic;
using System.Linq; namespace PaulSeal.Library.Utility
{
class Example
{
public List<int> GetRandomListOfNumbers()
{
List<int> results = new List<int>() { 1, 2, 3, 4, 5, 6 };
var sortedResults = from r in results orderby Guid.NewGuid() ascending select r;
return sortedResults.ToList();
}
}
}

On the first line, we create the list of results which is in ascending order.

Then we select each record from the results, ordered by a new Guid each time. This is what gives the randomness.

Finally we return the list.

Paul Seal

Umbraco MVP and .NET Web Developer from Derby (UK) who specialises in building Content Management System (CMS) websites using MVC with Umbraco as a framework. Paul is passionate about web development and programming as a whole. Apart from when he's with his wife and son, if he's not writing code, he's thinking about it or listening to a podcast about it.

Proudly sponsored by

Moriyama

  • Moriyama build, support and deploy Umbraco, Azure and ASP.NET websites and applications.
AppVeyor

  • CI/CD service for Windows, Linux and macOS
  • Build, test, deploy your apps faster, on any platform.
elmah.io

  • elmah.io is the easy error logging and uptime monitoring service for .NET.
  • Take back control of your errors with support for all .NET web and logging frameworks.
uSync Complete

  • uSync.Complete gives you all the uSync packages, allowing you to completely control how your Umbraco settings, content and media is stored, transferred and managed across all your Umbraco Installations.
uSkinned

  • More than a theme for Umbraco CMS, take full control of your content and design with a feature-rich, award-nominated & content editor focused website platform.
UmbHost

  • Affordable, Geo-Redundant, Umbraco hosting which gives back to the community by sponsoring an Umbraco Open Source Developer with each hosting package sold.