Aggiunta documentazione DbContext generics

Author: Angelo Pirola

src/NET6CustomLibrary/Docs/README-DbContext-Generics.md

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+# Entity Framework Core DbContext generics methods configuration
+
+
+## Example entity
+
+In this example, the entity is a data model that implements the *IEntity* interface and has a primary key of type *int*.
+
+```csharp
+namespace MyNet6Project;
+
+public class MyEntity : IEntity<int>
+{
+    public int Id { get; set; }
+    public string Name { get; set; }
+    public string Description { get; set; }
+}
+```
+
+
+## Example interface
+
+In this example, the interface is a service that implements the *IMyService* interface.
+
+```csharp
+namespace MyNet6Project;
+
+public interface IMyService
+{
+    Task<List<MyEntity>> GetListItemAsync();
+    Task<MyEntity> GetItemAsync(int id);
+    Task CreateItemAsync(MyEntity item);
+    Task UpdateItemAsync(MyEntity item);
+    Task DeleteItemAsync(MyEntity item);
+}
+```
+
+
+## Example class
+
+In this example, the class is a service that implements the *IMyService* interface.
+
+```csharp
+namespace MyNet6Project;
+
+public class MyService : IMyService
+{
+    private readonly IUnitOfWork<MyEntity, int> unitOfWork;
+
+    public MyService(IUnitOfWork<MyEntity, int> unitOfWork)
+    {
+        this.unitOfWork = unitOfWork;
+    }
+
+    public async Task<List<MyEntity>> GetListItemAsync()
+    {
+        var listItem = await unitOfWork.ReadOnly.GetAllAsync();
+        return listItem;
+    }
+
+    public async Task<MyEntity> GetItemAsync(int id)
+    {
+        var item = await unitOfWork.ReadOnly.GetByIdAsync(id);
+        return item;
+    }
+
+    public async Task CreateItemAsync(MyEntity item)
+    {
+        await unitOfWork.Command.CreateAsync(item);
+    }
+
+    public async Task UpdateItemAsync(MyEntity item)
+    {
+        await unitOfWork.Command.UpdateAsync(item);
+    }
+
+    public async Task DeleteItemAsync(MyEntity item)
+    {
+        await unitOfWork.Command.DeleteAsync(item);
+    }
+}
+```
+
+
+## Registering services at Startup
+
+```csharp
+public Startup(IConfiguration configuration)
+{
+  Configuration = configuration;
+}
+
+public IConfiguration Configuration { get; }
+	
+public void ConfigureServices(IServiceCollection services)
+{
+  //OMISSIS
+
+  services.AddDbContextGenericsMethods<MyDbContext>();
+  
+  //OMISSIS
+}
+```
+
+<b>Note:</b> You need to replace the <b>MyDbContext</b> value with the actual implementation of your DbContext