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  • Roberto Modica 13 posts 53 karma points
    Aug 07, 2019 @ 22:03
    Roberto Modica
    0

    WorkflowType Dependency Injection (DI)

    Hi all,

    I have a custom workflow, which requires a set of external dependencies. and i am having trouble injecting them.

    I tried to update the constructor but that leads to a boot error and i can't get past it. Also tried to property inject (i know not ideal) but my properties are always null.

    Is there way to do this via a constructor? if not, how do i get property injection to work with the Umbraco DI wrapper around LightInject which seems to do it out of the box?

    Thanks,

    Rob

  • Nathan Woulfe 421 posts 1578 karma points MVP 3x c-trib
    Aug 08, 2019 @ 06:01
    Nathan Woulfe
    0

    Hi Rob

    Have you looked at the Composer/Component pattern? There's a solid set of docs at https://our.umbraco.com/documentation/Implementation/Composing/

    Essentially what you need to do is create a component to register your dependencies (or any other code that needs to run on startup), then register that component in a collection, which is implemented by a composer. Probably over-simplifying the explanation, but that's the guts of it.

    Key part from the docs:

    namespace My.Website
    {
        public class SubscribeToContentServiceSavingComposer : IUserComposer
        {
            public void Compose(Composition composition) {
                Composition.Components().Append<SubscribeToContentServiceSavingComponent>();
            }
        }
    
        public class SubscribeToContentServiceSavingComponent : IComponent
        {
            // initialize: runs once when Umbraco starts
            public void Initialize()
            {
                ContentService.Saving += ContentService_Saving;
            }
    
            // terminate: runs once when Umbraco stops
            public void Terminate()
            {
            }
    
            private void ContentService_Saving(IContentService sender, ContentSavingEventArgs e)
            {
                // do something when content saves
            }
        }
    } 
    
  • Roberto Modica 13 posts 53 karma points
    Aug 08, 2019 @ 08:26
    Roberto Modica
    0

    Hi Nathan,

    Does something like this work with a Umbraco Forms workflow as that is what i am dealing with, if so does anyone know where i could find any examples to take a look at as well as the docs?

    Also, i have a bunch of dependencies, would i have to create a component for each one, i was hoping this was simple case of me not getting the Umbraco composer wrapper around light inject which has property injection out of the box.

  • Nathan Woulfe 421 posts 1578 karma points MVP 3x c-trib
    Aug 12, 2019 @ 03:57
    Nathan Woulfe
    0

    Not sure about Forms sorry... Not being OSS, Forms can be tricky to work with since there's no repo to poke through...

    Re multiple dependencies, these can be registered in a single component, or you could create multiple components to logically group the dependencies. As far as I know, either option is fine.

  • Roberto Modica 13 posts 53 karma points
    Aug 08, 2019 @ 12:47
    Roberto Modica
    0

    I am not sure a component would work here. I mean the underlying theory works but there doesn't seem to be a function to hook into, the RecordService no longer seems to exist from samples i have found.

    I am trying to hijack the On Approve event of the form, so when a record is approved some other processing works.

    The custom workflow works, but i have to hard code all dependencies and i also need the UmbracoHelper so i used the IUmbracoContextFactory in the dependendency that needed it, but it becomes pretty useless if i can't inject.

    LightInject states it has this out of the box (property injection) not sure why the Umbraco wrapper cripples this or its not well documented.

    Any help would be greatly appreciated.

  • Tony 104 posts 162 karma points
    Nov 05, 2019 @ 10:55
    Tony
    0

    Did you find a way to inject into a workflow? I'm facing the same issue and at the moment I'm having to use the AutoFac dependency resolver to get the service which isn't ideal.

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