customize-the-generated-interface.md

April 28, 2026 · View on GitHub

Customize the generated interface

This example shows how to place a generated contract in a dedicated Contracts namespace.

DI.Setup(nameof(Composition))
    .Bind().To<InvoiceGenerator>()
    .Root<App>(nameof(App));

var composition = new Composition();
var app = composition.App;

app.InvoiceId.ShouldBe("INV-0042");

public class App(IMyInvoiceGenerator generator)
{
    public string InvoiceId { get; } = generator.Format(42);
}

namespace Contracts
{
    public partial interface IMyInvoiceGenerator;

    [GenerateInterface(namespaceName: "Contracts", interfaceName: nameof(IMyInvoiceGenerator))]
    public class InvoiceGenerator : IMyInvoiceGenerator
    {
        public string Format(int number) => $"INV-{number:0000}";
    }
}

Running this code sample locally

Make sure you have the .NET SDK 10.0 or later installed

dotnet --list-sdk

Create a net10.0 (or later) console application

dotnet new console -n Sample

Add a reference to the NuGet package
- Pure.DI

dotnet add package Pure.DI

Copy the example code into the Program.cs file

You are ready to run the example 🚀

dotnet run

The example shows how to:

Generate an interface into a custom namespace
Rename the generated interface
Keep the contract separate from implementation details