Fixed: Value cannot be null Parameter Name: source

I ran into this message whilst coding an app for Xamarin, but this is definitely an odd way to report the error that's actually happening, but as always there's always one error in a project where you think. What the hell is that? Value cannot be null Parameter Name: source usually happens on an IEnumerable for one reason.

Chances are that the List/IEnumerable you're trying to work on is null or an object within the list is null, but I'd check the former first as it's more likely.

That's it. Short post but an annoying error message for such a simple answer.


Published at

Tags: C#

Luke Alderton

Comments

Post a comment
Sit tight...
We're adding your comment.
Thank you.
Your comment has been added.
There's been a problem.
Please try again later.
Share with
Tags
Latest Comments
By Luke Alderton on Replacing the Xamarin Header/Navigation bar with a custom view/template
17 Jan 2018, 15:30 PM
By Luke Alderton on My experience at Umbraco UK Festival 2017
17 Jan 2018, 14:51 PM
By Victor La Fortuna on Solved: 'Debug/ibTool/LaunchScreen.storyboardc/Info.plist does not exist' Xamarin
10 Jan 2018, 14:32 PM
By Jose Luis on Replacing the Xamarin Header/Navigation bar with a custom view/template
7 Jan 2018, 11:06 AM
By Chris Howarth on My experience at Umbraco UK Festival 2017
28 Dec 2017, 10:32 AM
By Luke Alderton on Xamarin forms - Stop/Cancel back button event
20 Dec 2017, 05:49 AM
By Antony on Xamarin forms - Stop/Cancel back button event
18 Dec 2017, 11:19 AM
By dipbleds on Raspberry Pi - Bluetooth using Bluecove on Raspbian
12 Dec 2017, 21:29 PM
Categories
App Development
Event
Game Development
Mapping
Modelling
Programming
Review
Robotics
Tutorial
Web Development