CODEWITHSUNDEEP
c#asp.net-coredependency-injection
aries
aries

Reputation: 45

.NET Core DI equivalent to Autofac's WithParameter

I am using this in Autofac with the following registration:

builder.RegisterType<SBOTaskerHelper>()
    .As<ISBOTaskerHelper>()
    .AsSelf()
    .UsingConstructor(
        typeof(IPrincipal),
        typeof(IPortalSettings),
        typeof(ILogger<SBOTaskerHelper>),
        typeof(bool))
    .WithParameter("debugMode", Portal.Site.DebugMode)
    .InstancePerRequest();

Moving to ASP.NET Core dependency injection. How to pass constructors and parameters to configure services DI?

Upvotes: 2

Views: 959

Answers (1)

Steven
Steven

Reputation: 172646

The following registration would be roughly the same:

services.AddScoped<SBOTaskerHelper>(
    p => ActivatorUtilities.CreateInstance<SBOTaskerHelper>(
        p, Portal.Site.DebugMode));
services.AddScoped<ISBOTaskerHelper>(
    p => p.GetRequiredService<SBOTaskerHelper>());

ActivatorUtilities.CreateInstance is a helper method of MS.DI. It allows creating the given type, where its dependencies are resolved from the supplied IServiceProvider, while allowing constructor arguments to be overridden. In this case we're instructing MS.DI to supply the Portal.Site.DebugMode to the first bool property in SBOTaskerHelper's constructor.

Note that there is no .As<T>().AsSelf() in MS.DI. You need to add a second registration and forward the registration to the previous one. This is done using services.AddXXX<IX>(p => p.GetRequiredService<X>()).

Upvotes: 2

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