What causes "Service resources do not produce any services" in microsoft/aspire?

Filter resources by concrete type (e.g. pattern-match on ContainerResource/ProjectResource) before accessing ServicesProduced

microsoft/aspire · error · InvalidOperationException

Service resources do not produce any services

Error message

Service resources do not produce any services

What it means

In the DCP model, AppResource wrappers expose ServicesProduced/ServicesConsumed lists describing service-to-service relationships. A ServiceWithModelResource wraps a DCP Service object, which by definition does not produce services — the base class contract requires the property, so the getter throws InvalidOperationException to mark the operation as meaningless for this subtype.

Solutions

Filter resources by concrete type (e.g. pattern-match on ContainerResource/ProjectResource) before accessing ServicesProduced
Check whether the AppResource is a ServiceWithModelResource and skip it in service-graph traversal
Read service relationships from the EndpointAnnotation on ServiceWithModelResource instead

Example fix

// before
var produced = appResource.ServicesProduced; // throws for ServiceWithModelResource
// after
var produced = appResource is ServiceWithModelResource ? [] : appResource.ServicesProduced;

Defensive patterns

Strategy: type-guard

Validate before calling

if (appResource is ServiceWithModelResource)
{
    // No ServicesProduced data; skip this resource.
    return [];
}

Type guard

bool HasProducedServices(AppResource r) => r is not ServiceWithModelResource;

Try / catch

try
{
    var produced = appResource.ServicesProduced;
}
catch (InvalidOperationException) when (appResource is ServiceWithModelResource)
{
    var produced = [];
}

Prevention

Pattern-match the concrete AppResource type before touching service lists
Use EndpointAnnotation on ServiceWithModelResource for service relationships
Exclude Service resources when building produced/consumed service graphs
Add unit coverage for traversal code over all AppResource subtypes

When it happens

Trigger: Code iterating DCP app resources and reading ServicesProduced on a ServiceWithModelResource instance instead of filtering to container/project resource types first.

Common situations: Dashboard or executor code that generically walks all AppResource subtypes without checking the concrete type; new code assuming every AppResource carries service-production info.

Understand the failure class

Background: UnsupportedOperationException and "is not supported" errors: when a library deliberately refuses a call — this error's family across 30 libraries.

Related errors

AI-assisted analysis of microsoft/aspire@25830f84bd (2026-09-16). Data as JSON: /api/errors/9b33e64e9408080a. Report an issue: GitHub.

Appendix: source

Thrown at src/Aspire.Hosting/Dcp/AppResource.cs:89

    public IResource ModelResource { get; }

    public RenderedModelResource(IResource modelResource, TDcpResource dcpResource) : base(dcpResource)
    {
        ModelResource = modelResource;
    }

    public virtual List<ServiceWithModelResource> ServicesProduced { get; } = [];
    public virtual List<ServiceWithModelResource> ServicesConsumed { get; } = [];
}

internal sealed class ServiceWithModelResource : RenderedModelResource<Service>
{
    public Service Service => DcpResource;
    public EndpointAnnotation EndpointAnnotation { get; }

    public override List<ServiceWithModelResource> ServicesProduced
    {
        get { throw new InvalidOperationException("Service resources do not produce any services"); }
    }
    public override List<ServiceWithModelResource> ServicesConsumed
    {
        get { throw new InvalidOperationException("Service resources do not consume any services"); }
    }

    public ServiceWithModelResource(IResource modelResource, Service service, EndpointAnnotation sba) : base(modelResource, service)
    {
        EndpointAnnotation = sba;
    }
}

internal interface IResourceReference
{
    IResource ModelResource { get; }
    string DcpResourceName { get; }
}

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