Null services | C# Online Compiler

Null services by Dan Ingalla

using System;
using Microsoft.Extensions.DependencyInjection;
					
public class Program
{
	public class SomeDependency
	{
	}
	
	public class SomeService
	{
		public SomeService(SomeDependency dependency)
		{
		}
	}
	
	public static void Main()
	{
		var services = new ServiceCollection();
		
		services.AddTransient<SomeService>();
		
		var provider = services.BuildServiceProvider();
		
		// This will throw InvalidOperationException because SomeDependency is not registered
		var service = provider.GetRequiredService<SomeService>();
	}
}

 
using System;
using Microsoft.Extensions.DependencyInjection;
                    
public class Program
{
    public class SomeDependency
    {
    }
    
    public class SomeService
    {
        public SomeService(SomeDependency dependency)
        {
        }
    }
    
    public static void Main()
    {
        var services = new ServiceCollection();
        
        services.AddTransient<SomeService>();
        
        var provider = services.BuildServiceProvider();
        
        // This will throw InvalidOperationException because SomeDependency is not registered
        var service = provider.GetRequiredService<SomeService>();
    }
}

Unhandled exception. System.InvalidOperationException: Unable to resolve service for type 'Program+SomeDependency' while attempting to activate 'Program+SomeService'.
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateArgumentCallSites(ServiceIdentifier serviceIdentifier, Type implementationType, CallSiteChain callSiteChain, ParameterInfo[] parameters, Boolean throwIfCallSiteNotFound)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateConstructorCallSite(ResultCache lifetime, ServiceIdentifier serviceIdentifier, Type implementationType, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact(ServiceDescriptor descriptor, ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain, Int32 slot)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact(ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateCallSite(ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.GetCallSite(ServiceIdentifier serviceIdentifier, CallSiteChain callSiteChain)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(ServiceIdentifier serviceIdentifier)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(ServiceIdentifier serviceIdentifier, ServiceProviderEngineScope serviceProviderEngineScope)
   at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Program.Main()
Command terminated by signal 6

Last Run:	1:09:10 am
Compile:	0.016s
Execute:	0.19s
Memory:	8.09Mb
CPU:	0.206s

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