Optional parameters with dependency injection

Is it possible to have an optional parameter for a constructor with dependency injection. I know that dependency injection usually it implies it is a required dependency, but for example if the only dependency is an

ILogger

ILogger

, then I don't really care if one was registered or not.

EDIT: Changed

ILogger<Test>

ILogger<Test>

to be nullable

public class Test
{
    private readonly ILogger<Test>? _logger;

    public Test(ILogger<Test>? logger = null) // does this work?
    {
        _logger = logger
    }

    public void DoSomething()
    {
        _logger?.LogInformation("Doing something...");
    }
}

public class Test
{
    private readonly ILogger<Test>? _logger;

    public Test(ILogger<Test>? logger = null) // does this work?
    {
        _logger = logger
    }

    public void DoSomething()
    {
        _logger?.LogInformation("Doing something...");
    }
}

C#•3y ago•

9 replies

nathanAjacobs

Optional parameters with dependency injection

ILogger

ILogger

, then I don't really care if one was registered or not.

EDIT: Changed

ILogger<Test>

ILogger<Test>

to be nullable

public class Test
{
    private readonly ILogger<Test>? _logger;

    public Test(ILogger<Test>? logger = null) // does this work?
    {
        _logger = logger
    }

    public void DoSomething()
    {
        _logger?.LogInformation("Doing something...");
    }
}

public class Test
{
    private readonly ILogger<Test>? _logger;

    public Test(ILogger<Test>? logger = null) // does this work?
    {
        _logger = logger
    }

    public void DoSomething()
    {
        _logger?.LogInformation("Doing something...");
    }
}

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