Is there a Linq method to add a single item to an IEnumerable?

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One way would be to create a singleton-sequence out of the item (such as an array), and then Concat it onto the original:

image.Layers.Concat(new[] { image.ParentLayer } )

If you’re doing this really often, consider writing an Append (or similar) extension-method, such as the one listed here, which would let you do:

image.Layers.Append(image.ParentLayer)

.NET Core Update (per the “best” answer below):

Append and Prepend have now been added to the .NET Standard framework, so you no longer need to write your own. Simply do this:

image.Layers.Append(image.ParentLayer)

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