.NET Core 3.1 GetService return null

user_4738685 0
Viewed 1366

I am new to .NET Core and I got stuck on this.

In my startup.cs, I have

services.AddScoped<IEmailService, EmailService>();

and I have created a IHostedService:

 services.AddHostedService<CooldownExpiredService>();

inside my CooldownExpiredService, I have the following code

using (var emailScope = _serviceScopeFactory.CreateScope())
{
    var _emailService = emailScope.ServiceProvider.GetService<EmailService>();
}

but the object I get is null. How can I get the EmailService inside from HostedService?

asp.net-core-hosted-services .net-core
2 Answers

i dont knwo why i should have use the interface.

emailScope.ServiceProvider.GetService<IEmailService>()
user_47386850

You can add Extension Method for all Services first : add class =>

public static class ServiceTool
    {
        private static IServiceProvider ServiceProvider { get; set; }
        public static IServiceCollection Create(IServiceCollection servicesProvider)
        {
            ServiceProvider = servicesProvider.BuildServiceProvider();
            return servicesProvider;
        }

        public static T Resolve<T>()
        {
            return ServiceProvider.GetService<T>();
        }
    }

And go to the Startup and add it

ServiceTool.Create(services);

For use in controller write on constructor controller example:

_logRepository = ServiceTool.Resolve<ILogRepository>();
user_65330450
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