NDLRGEN031: Provider class requires partial modifier¶

Diagnostic Info¶

Property	Value
ID	NDLRGEN031
Category	NexusLabs.Needlr.Generators
Severity	Error
Enabled	Yes

Description¶

This error is raised when a class has the [Provider] attribute but is not declared with the partial modifier. The generator needs to add an interface implementation and constructor to the class, which requires it to be partial.

Example¶

Code that triggers the error¶

using NexusLabs.Needlr.Generators;

// ❌ NDLRGEN031: Class needs partial modifier
[Provider(typeof(IOrderRepository))]
public class OrderProvider { }

How to fix¶

Add the partial modifier to the class:

using NexusLabs.Needlr.Generators;

// ✅ Correct: Class is partial
[Provider(typeof(IOrderRepository))]
public partial class OrderProvider { }

Why This Matters¶

When using [Provider] on a class (shorthand mode), the source generator creates:

A generated interface (IOrderProvider)
A partial class implementation with constructor and properties

Without the partial modifier, the compiler cannot merge the generated code with your class definition.

Alternative: Interface Mode¶

If you don't want a partial class, use interface mode instead:

[Provider]
public interface IOrderProvider
{
    IOrderRepository Repository { get; }
}

The generator will create the implementation class for you in the {AssemblyName}.Generated namespace.