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Showing posts from March, 2022

Service Location in Umbraco 9

I should probably start this post with a caveat saying, "don't do this... unless you really, really have to!" With Umbraco 9, built on .NET 5, we have support for the dependency injection design pattern , and where possible, the recommedation is to use that, to promote testability and other best practices. Within the Umbraco CMS source code though, and also in the add-on products Forms and Deploy, we have found it necessary to use service location in a couple of instances. Primarily, to avoid breaking changes. For example, when a public class requires a new dependency, we don't just add it to the constructor as that would potentially break integrations that are already using it. Instead we obsolete the existing constructor, create a new one with the additional parameter, and have the original constructor delegate to the new one - using service location to provide the parameter for the added dependency. In code it looks like this: To use, you need to be ref