Initial commit

ServiceRegistration.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29411.108
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ServiceRegistration", "ServiceRegistration\ServiceRegistration.csproj", "{647DC861-3B1F-4322-9A58-23BC11779D8A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ServiceRegistrationLibrary", "ServiceRegistrationLibrary\ServiceRegistrationLibrary.csproj", "{E6E64FE6-90A5-4728-9CB2-83A13666CD85}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{647DC861-3B1F-4322-9A58-23BC11779D8A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{647DC861-3B1F-4322-9A58-23BC11779D8A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{647DC861-3B1F-4322-9A58-23BC11779D8A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{647DC861-3B1F-4322-9A58-23BC11779D8A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E6E64FE6-90A5-4728-9CB2-83A13666CD85}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E6E64FE6-90A5-4728-9CB2-83A13666CD85}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E6E64FE6-90A5-4728-9CB2-83A13666CD85}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E6E64FE6-90A5-4728-9CB2-83A13666CD85}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {6490A37E-875F-4191-BFA1-5F96AAC81301}
+	EndGlobalSection
+EndGlobal

ServiceRegistration/Program.cs

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+using Microsoft.Extensions.DependencyInjection;
+using ServiceRegistration.Services;
+using ServiceRegistrationLibrary;
+using System;
+using System.Reflection;
+
+namespace ServiceRegistration
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+
+            var serviceCollection = new ServiceCollection();
+            serviceCollection.RegisterCustomServices();
+            var serviceProvider = serviceCollection.BuildServiceProvider();
+
+
+            var service = serviceProvider.GetService<ITestService>();
+            service.DoSth();   
+
+
+            Console.ReadLine();
+        }
+    }
+}

ServiceRegistration/ServiceRegistration.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ServiceRegistrationLibrary\ServiceRegistrationLibrary.csproj" />
+  </ItemGroup>
+
+</Project>

ServiceRegistration/Services/IMailService.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistration.Services
+{
+    public interface IMailService
+    {
+        void SendMail();
+    }
+}

ServiceRegistration/Services/ITestService.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistration.Services
+{
+    public interface ITestService
+    {
+        void DoSth();
+    }
+}

ServiceRegistration/Services/MailService.cs

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+using ServiceRegistrationLibrary.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistration.Services
+{
+    [TransientService]
+    public class MailService : IMailService
+    {
+        public void SendMail()
+        {
+            Console.WriteLine("Mail Sent");
+        }
+    }
+}

ServiceRegistration/Services/TestService.cs

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+using ServiceRegistrationLibrary.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistration.Services
+{
+    [SingletonService]
+
+    public class TestService : ITestService
+    {
+        private readonly IMailService _mailService;
+
+        public TestService(IMailService mailService)
+        {
+            _mailService = mailService;
+        }
+        public void DoSth()
+        {
+            Console.WriteLine("Working");
+            _mailService.SendMail();
+        }
+    }
+}

ServiceRegistrationLibrary/Attributes/ScopedServiceAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistrationLibrary.Attributes
+{
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+    public class ScopedServiceAttribute : Attribute
+    {
+    }
+}

ServiceRegistrationLibrary/Attributes/SingletonServiceAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistrationLibrary.Attributes
+{
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+
+    public class SingletonServiceAttribute : Attribute
+    {
+    }
+}

ServiceRegistrationLibrary/Attributes/TransientServiceAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ServiceRegistrationLibrary.Attributes
+{
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+    public class TransientServiceAttribute : Attribute
+    {
+    }
+}

ServiceRegistrationLibrary/ServiceExtension.cs

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+using Microsoft.Extensions.DependencyInjection;
+using ServiceRegistrationLibrary.Attributes;
+using System;
+using System.Linq;
+using System.Reflection;
+
+namespace ServiceRegistrationLibrary
+{
+    public static class ServiceExtension
+    {
+
+        public static ServiceCollection RegisterCustomServices(this ServiceCollection services)
+        {
+            var assembly = Assembly.GetCallingAssembly();
+            return RegisterCustomServicesFunctionality(services, assembly, "Service");
+        }
+
+        public static ServiceCollection RegisterCustomServices(this ServiceCollection services, Assembly assembly)
+        {
+            return RegisterCustomServicesFunctionality(services, assembly, "Service");
+        }
+
+
+        public static ServiceCollection RegisterCustomServices(this ServiceCollection services, string name)
+        {
+            var assembly = Assembly.GetCallingAssembly();
+            return RegisterCustomServicesFunctionality(services, assembly, name);
+        }
+        public static ServiceCollection RegisterCustomServices(this ServiceCollection services, Assembly assembly, string name)
+        {
+            return RegisterCustomServicesFunctionality(services, assembly, name);
+        }
+
+
+
+        private static ServiceCollection RegisterCustomServicesFunctionality(ServiceCollection services, Assembly assembly, string name)
+        {
+            var types = assembly.GetTypes().Where(x => x.Name.Contains(name) && x.IsClass);
+            foreach (var type in types)
+            {
+                var intrfce = type.GetInterfaces().FirstOrDefault(x => x.Name.Contains(name));
+                if (intrfce == null) continue;
+                var attribute = type.CustomAttributes.FirstOrDefault(x => x.AttributeType.Name.Contains("ServiceAttribute"));
+
+                if (attribute == null)
+                {
+                    services.AddTransient(intrfce, type);
+                }
+                else if (attribute.AttributeType.Equals(typeof(TransientServiceAttribute)))
+                {
+                    services.AddTransient(intrfce, type);
+                }
+                else if (attribute.AttributeType.Equals(typeof(SingletonServiceAttribute)))
+                {
+                    services.AddSingleton(intrfce, type);
+                }
+                else if (attribute.AttributeType.Equals(typeof(ScopedServiceAttribute)))
+                {
+                    services.AddScoped(intrfce, type);
+                }
+            }
+            return services;
+        }
+    }
+}

ServiceRegistrationLibrary/ServiceRegistrationLibrary.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.0.0" />
+  </ItemGroup>
+
+</Project>