WebAPI.md

Wep API

This example demonstrates the creation of a Web API application in the pure DI paradigm using the Pure.DI code generator.

Composition setup file is Composition.cs:

using Pure.DI;
using static Pure.DI.Lifetime;

internal partial class Composition: ServiceProviderFactory<Composition>
{
    void Setup() => DI.Setup()
        .DependsOn(Base)
        // Specifies not to attempt to resolve types whose fully qualified name
        // begins with Microsoft.Extensions., Microsoft.AspNetCore.
        // since ServiceProvider will be used to retrieve them.
        .Hint(
            Hint.OnCannotResolveContractTypeNameRegularExpression,
            @"^Microsoft\.(Extensions|AspNetCore)\..+$")

        .Bind().As(Singleton).To<WeatherForecastService>()
        // Provides the composition root for Weather Forecast controller
        .Root<WeatherForecastController>();
}

The composition class inherits from the ServiceProviderFactory<T> class, where T is the composition class itself. It depends on the Base setup.

Te web application entry point is in the Program.cs file:

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews().AddControllersAsServices();

// Uses Composition as an alternative IServiceProviderFactory
builder.Host.UseServiceProviderFactory(new Composition());

The project file looks like this:

<Project Sdk="Microsoft.NET.Sdk.Web">

    <PropertyGroup>
        <TargetFramework>net8.0</TargetFramework>
        <Nullable>enable</Nullable>
        <ImplicitUsings>enable</ImplicitUsings>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Pure.DI" Version="2.1.38">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
        <PackageReference Include="Pure.DI.MS" Version="2.1.36" />
    </ItemGroup>

</Project>

It contains additional references to NuGet packages:

Pure.DI		DI Source code generator
Pure.DI.MS		Tools for working with Microsoft DI