First commit

.gitignore

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+/.vs/*
+/*/obj/*

DaSaSo.Domain/DaSaSo.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

DaSaSo.Domain/Model/Client.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Domain.Model
+{
+    public class Client : DomainObject
+    {
+        public string Firstname { get; set; }
+        public string LastName { get; set; }
+    }
+}

DaSaSo.Domain/Model/DomainObject.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Domain.Model
+{
+    public class DomainObject
+    {
+        public int Id { get; set; }
+    }
+}

DaSaSo.Domain/Model/Project.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Domain.Model
+{
+    public class Project : DomainObject
+    {
+        public string Name {  get; set; }
+        public Client Client { get; set; }
+    }
+}

DaSaSo.Domain/Services/IDataService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Domain.Service
+{
+    public interface IDataService<T>
+    {
+        Task<IEnumerable<T>> GetAll();
+        Task<T> Get(int id);
+        Task<T> Create(T entity);
+        Task<T> Update(int id, T entity);
+        Task<bool> Delete(int id);
+    }
+}

DaSaSo.EntityFramework/DaSaSo.EntityFramework.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

DaSaSo.EntityFramework/DaSaSoDbContext.cs

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+using DaSaSo.Domain.Model;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.EntityFramework
+{
+    public class DaSaSoDbContext : DbContext
+    {
+        public DaSaSoDbContext(DbContextOptions options) : base(options)
+        {
+        }
+
+        public DbSet<Client> Clients { get; set; }
+    }
+}

DaSaSo.EntityFramework/DaSaSoDbContextFactory.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.EntityFramework
+{
+    public class DaSaSoDbContextFactory : IDesignTimeDbContextFactory<DaSaSoDbContext>
+    {
+        public DaSaSoDbContext CreateDbContext(string[] args)
+        {
+            var options = new DbContextOptionsBuilder<DaSaSoDbContext>();
+            options.UseNpgsql("server = localhost");
+            return new DaSaSoDbContext(options.Options);
+        }
+    }
+}

DaSaSo.EntityFramework/Services/GenericDataService.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Service;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.EntityFramework.Services
+{
+    public class GenericDataService<T> : IDataService<T> where T : DomainObject
+    {
+        private readonly DaSaSoDbContextFactory _contextFactory;
+
+        public GenericDataService(DaSaSoDbContextFactory contextFactory)
+        {
+            this._contextFactory = contextFactory;
+        }
+
+        public async Task<T> Create(T entity)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                EntityEntry<T> createdEntity = await context.Set<T>().AddAsync(entity);
+                await context.SaveChangesAsync();
+                return createdEntity.Entity;
+            }
+        }
+
+        public async Task<bool> Delete(int id)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                T entity = await context.Set<T>().FirstOrDefaultAsync((e) => e.Id == id);
+                context.Set<T>().Remove(entity);
+                await context.SaveChangesAsync();
+                return true;
+            }
+        }
+
+        public async Task<T> Get(int id)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                T entity = await context.Set<T>().FirstOrDefaultAsync((e) => e.Id == id);
+                
+                return entity;
+            }
+        }
+
+        public async Task<IEnumerable<T>> GetAll()
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                IEnumerable<T> entities = await context.Set<T>().ToListAsync();
+
+                return entities;
+            }
+        }
+
+        public async Task<T> Update(int id, T entity)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                entity.Id = id;
+                await context.Set<T>().Update(entity);
+
+                return entity;
+            }
+        }
+    }
+}

DaSaSo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31612.314
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DaSaSo.Domain", "DaSaSo.Domain\DaSaSo.Domain.csproj", "{9434EB7A-C6EE-46C7-8306-BE806375E852}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DaSaSo.EntityFramework", "DaSaSo.EntityFramework\DaSaSo.EntityFramework.csproj", "{E75F15AE-D49B-4768-A5EA-DC05AB60A898}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9434EB7A-C6EE-46C7-8306-BE806375E852}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9434EB7A-C6EE-46C7-8306-BE806375E852}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9434EB7A-C6EE-46C7-8306-BE806375E852}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9434EB7A-C6EE-46C7-8306-BE806375E852}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E75F15AE-D49B-4768-A5EA-DC05AB60A898}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E75F15AE-D49B-4768-A5EA-DC05AB60A898}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E75F15AE-D49B-4768-A5EA-DC05AB60A898}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E75F15AE-D49B-4768-A5EA-DC05AB60A898}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {0C7F29DD-63BA-4EC1-80F3-0688F866C9B6}
+	EndGlobalSection
+EndGlobal