CODEWITHSUNDEEP
asp.net-coredependency-injectionsingleton
n1k1
n1k1

Reputation: 61

Consume Scoped Service From Singleton

While consuming a scoped from singleton I am not getting any error

According to below article, i should get an error as soon as I start my service: https://dotnetcoretutorials.com/2018/03/20/cannot-consume-scoped-service-from-singleton-a-lesson-in-asp-net-core-di-scopes/

Dependency Registered :

builder.Services.AddScoped<ILogger, AppLogs>();
            builder.Services.AddSingleton<ICacheFactory>(x =>
            {
                string cacheConnectionString = "xyz";
                return new CacheFactory(cacheConnectionString, x.GetService<ILogger>());
            });

Consumed:

    public class Function1
    {
        private readonly ICacheFactory cacheProvider;
        public Function1(ICacheFactory cacheProvider) {
            this.cacheProvider = cacheProvider;
        }


        [FunctionName("Function1")]
        public  async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {


            var result = await this.cacheProvider.GetResultsAsync<IEnumerable<string>>("abc").ConfigureAwait(false);}
}

When does a scoped injected in a singleton give an issue?

Upvotes: 0

Views: 473

Answers (1)

Rosco
Rosco

Reputation: 2474

To get an error when using scoped services in singleton instances you must set the ValidateScopes option to true when building the service provider e.g.

var provider = services.BuildServiceProvider(validateScopes: true);

The validation is somewhat expensive so you can change it to only validate when you are developing like this:

var provider = services.BuildServiceProvider(validateScopes: Debugger.IsAttached);

Documentation on BuildServiceProvider

Upvotes: 1

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