There is a class that uses some dependencies that will come from the constructor.

public class FooHttpApiHostModule : AbpModule
{
    private readonly ICustomContext _customContext;

    public FooHttpApiHostModule(ICustomContext customContext)
    {
        _customContext = customContext;
    }

    // Some other code here.
}

Inside the ApplicationModule, There is a scope added for it.

public class FooApplicationModule : AbpModule
{
    public override void ConfigureServices(ServiceConfigurationContext context)
    {
        context.Services
            .AddScoped<ICustomContext, CustomContext>();
    }
}

But when the code is running, next exception occur:

System.MissingMethodException: Cannot dynamically create an instance of type FooHttpApiHostModule.
Reason: No parameterless constructor defined.

The exception happens inside the Startup class on next line.

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddApplication<FooHttpApiHostModule>(); // <-- Exception on this line.
    }
}

Is there any other way to inject ICustomContext into FooHttpApiHostModule?

Update 1:

When writing this line in the ConfigureServices of my FooHttpApiHostModule

var graphContext = context.Services.GetRequiredService<ICustomContext>();

Next error occur

System.ArgumentNullException: Value cannot be null.
(Parameter provider)

Full code:

public class FooHttpApiHostModule : AbpModule
{
    // Removed constructor and private readonly variable.

    public override void ConfigureServices(ServiceConfigurationContext context)
    {
        ICustomContext customContext = context.Services.GetRequiredService<ICustomContext>(); // <-- exception on this line.
    }

    // Other code here...
}

Did an extra check and ICustomContext is added to the scope.

CodePudding user response：

You cannot use constructor injection like as you did for FooHttpApiHostModule.

Instead, you should use code like the below:

public class FooHttpApiHostModule : AbpModule
{

     public override void ConfigureServices(ServiceConfigurationContext context)
     {
        var customContext = context.Services.GetRequiredService<ICustomContext>()
        // customContext.Do();
        // Some other code here.
     }
}

Reference:

1. https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-6.0#resolve-a-service-at-app-start-up