umbraco 9 registering a service and exposing it to dependency injection

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David Armitage 505 posts 2073 karma points

Jun 07, 2021 @ 14:11

Umbraco 9

Hi All,

Does anyone know how to convert this code to Umbraco 9.

I am trying to compose a service I have created called SiteHelper: ISiteHelper so I can then use it in my controllers using DI

public class SiteHelperComposer : IUserComposer
{
        public void Compose(Composition composition)
        {
            composition.Register<ISiteHelper, SiteHelper>(Lifetime.Singleton);
        }
}

Here is an example of my service I am trying to compose.

public interface ISiteHelper
{
        string TestMethod();
}

public class SiteHelper : ISiteHelper
{
    private readonly ILogger _logger;

    public SiteHelper(ILogger logger)
    {
        _logger = logger;
    }

    public string TestMethod()
    {
        try
        {
            throw new Exception();
        }
        catch (Exception e)
        {
            _logger.LogError(e, "Index | Exception: {0} | Message: {1} | Stack Trace: {2}", e.InnerException != null ? e.InnerException.ToString() : "", e.Message != null ? e.Message.ToString() : "", e.StackTrace);
        }

        return "This returned a value";
    }
}

I have been playing around with the following code in V9 but haven't got it to work.

builder.Services.AddSingleton<ISiteHelper, SiteHelper>();

I kind of had some success with this if I got rid of the logger but couldn't get it to work including the logger or other dependencies.

builder.Services.AddSingleton<ISiteHelper>((s) =>
{
       return new SiteHelper();
});

Kind Regards

David

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Mathias Hove 11 posts 74 karma points

Jun 07, 2021 @ 16:28

public class SiteHelper : ISiteHelper
{
    private readonly ILogger<SiteHelper> _logger;

    public SiteHelper(ILogger<SiteHelper> logger)
    {
           _logger = logger;
    }

    public string TestMethod()
    {
        try
        {
            throw new Exception();
        }
        catch (Exception e)
        {
            _logger.LogError(e, "Index | Exception: {0} | Message: {1} | Stack Trace: {2}", e.InnerException != null ? e.InnerException.ToString() : "", e.Message != null ? e.Message.ToString() : "", e.StackTrace);
        }

        return "This returned a value";
    }
}

this should fix it :)

Explained here https://stackoverflow.com/questions/52921966/unable-to-resolve-ilogger-from-microsoft-extensions-logging/57590076#57590076

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Mathias Hove 11 posts 74 karma points

Jun 09, 2021 @ 05:42

0

Did it work out for you? :)

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David Armitage 505 posts 2073 karma points

Jun 09, 2021 @ 06:09

0

I haven't tried yet. I will have a look this evening when tuning in to code garden.

usually just work on this stuff a couple of hours on a night or on a weekend. I will let you know how I get on.

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David Armitage 505 posts 2073 karma points

Jun 09, 2021 @ 11:07

Hi Mathias,

Thanks for helping me get that working. You was correct the composing was failing because of the ILogger was injected inforrectly.

For completion here is my code.

using System;
using Umbraco.Cms.Core.Composing;
using Microsoft.Extensions.Logging;
using Umbraco.Cms.Core.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;

namespace Website.Core.Helpers
{
    public class SiteHelperComposer : IUserComposer
    {
        public void Compose(IUmbracoBuilder builder)
        {
            builder.Services.AddSingleton<ISiteHelper, SiteHelper>();
        }
    }

    public interface ISiteHelper
    {
        string TestMethod();
    }

    public class SiteHelper : ISiteHelper
    {
        private readonly ILogger<SiteHelper> _logger;

        public SiteHelper(ILogger<SiteHelper> logger)
        {
            _logger = logger;
        }

        public string TestMethod()
        {

            try
            {
                throw new Exception();
            }
            catch (Exception e)
            {
                _logger.LogError(e, "Index | Exception: {0} | Message: {1} | Stack Trace: {2}", e.InnerException != null ? e.InnerException.ToString() : "", e.Message != null ? e.Message.ToString() : "", e.StackTrace);
            }

            return "This returned a value";
        }
    }
}

Thanks again.

David

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David Armitage 505 posts 2073 karma points

Jun 09, 2021 @ 12:14

1

I actually wrote a more in depth blog article on this subject if anyone is interested.

https://www.umbrajobs.com/blog/posts/2021/june/how-to-compose-a-custom-service-in-umbraco-9/

hope this info helps someone. Feel free to comment here if you need further help.

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