aspnet-core-api.md

Creating a ASP.NET Core Web API from scratch

Requires .NET 7 SDK

dotnet new sln -o MyApi
cd MyApi

dotnet new webapi -o MyApi

dotnet sln add ./MyApi/MyApi.csproj

dotnet new xunit -o MyApi.Tests

dotnet sln add ./MyApi.Tests/MyApi.Tests.csproj

dotnet add ./MyApi.Tests/MyApi.Tests.csproj reference ./MyApi/MyApi.csproj

cd MyApi

dotnet add package Microsoft.Extensions.DependencyInjection
dotnet add package DotNetEnv
dotnet add package MySql.Data
dotnet add package sqlkata
dotnet add package SqlKata.Execution

Read more

• https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-new
• https://learn.microsoft.com/en-us/dotnet/core/testing/unit-testing-with-dotnet-test

di-container.md

Replacing an already registered dependency for testing purposes

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
// ...

builder.ConfigureServices((hostBuilderContext, services) =>
{
    // Replacing an already registered dependency
    services.Replace(ServiceDescriptor.Transient<IFoo, Foo>());

    // Another syntax 
    services.Replace(ServiceDescriptor.Transient<IFoo>(_ => new Foo()));

    // Using a factory function for custom logic
    services.Replace(ServiceDescriptor.Transient<IFoo>((container) =>
    {
        // Custom logic
        // ...

        // var bar = container.GetRequiredService<Bar>();

        return new Foo();
    }));

    // Using a ServiceDescriptor
    var descriptor = new ServiceDescriptor(
            typeof(IFoo),
            typeof(Foo),
            ServiceLifetime.Transient);
    services.Replace(descriptor);
});

Note, this might not work with static class methods.