CODEWITHSUNDEEP
c#dependency-injectionninjectproviderninject-extensions
Hooman Bahreini
Hooman Bahreini

Reputation: 15559

How to pass an argument to custome provider using ninject

I have a service called MyRepository, I was to write my own custom provider for MyRepository. How can I pass an argument to the constructor of MyRepository using the provider?

This is my code:

public class MyRepository : IMyRepository
{
    private string _path;

    public MyRepository(string path)
    { 
        _path = path;
    }

    // more code...
}

public class MyRepositotyProvider : Provider<IMyRepositoty>
{
    public static IMyRepositoty CreateInstance()
    {
        return new MyRepository(/*how to pass an argument?*/);
    }

    protected override IMyRepositoty CreateInstance(IContext context)
    {
        // I need to pass path argument?
        return CreateInstance();
    }
}

// I need to pass the path argument to the provider
var instance = OrganisationReportPersisterProvider.CreateInstance(/*pass path arg*/);

Upvotes: 1

Views: 52

Answers (1)

Nkosi
Nkosi

Reputation: 247008

Based on your comment you could consider using an abstraction that can be passed to lower layers 

public interface ISomeSetting { 
    string Path { get; } 
}

and can then be resolved via the context in the provider

public class MyRepositotyProvider : Provider<IMyRepositoty> {

    public static IMyRepositoty CreateInstance(string path) {
        return new MyRepository(path);
    }

    protected override IMyRepositoty CreateInstance(IContext context) {
        ISomeSetting setting = context.Kernel.Get<ISomeSetting>()
        var path = setting.Path;
        return CreateInstance(path);
    }
}

The implementation will live in a higher layer and allows for decoupling.

Ideally the repository could have been refactored to depend on the abstraction

public class MyRepository : IMyRepository {
    private readonly string _path;

    public MyRepository(ISomeSetting setting)  
        _path = setting.Path;
    }

    // more code...
}

and avoid the need to have a provider to begin with.

Upvotes: 1

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