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 jack of ass on Replacing the Xamarin Header/Navigation bar with a custom view/template
16 Feb 2019, 03:13 AM
By Zal on Xamarin MasterDetailPage has large margin/padding at top
7 Feb 2019, 12:20 PM
By AndrewEcopE1 on MVC forms in Umbraco
7 Feb 2019, 01:16 AM
By AndrewEcopE1 on MVC forms in Umbraco
4 Feb 2019, 23:53 PM
By Ramachandran on Reducing Umbraco memory usage by enabling 32-bit applications
4 Feb 2019, 17:39 PM
By encoderu9 on MVC forms in Umbraco
4 Feb 2019, 10:51 AM
By AndrewEcopE1 on MVC forms in Umbraco
28 Jan 2019, 19:48 PM
By Luca Ziegler on Xamarin Forms app not updating after deploy
25 Jan 2019, 11:00 AM
Categories
App Development
Event
Game Development
Mapping
Modelling
Programming
Review
Robotics
Tutorial
Web Development