Description

Adds support for keyed service injection in data portal operations (.NET 8.0+). Developers can now specify a service key on the [Inject] attribute to retrieve keyed services registered with AddKeyed* methods.

Changes

• InjectAttribute: Added Key property (type object?) to specify service key
• ServiceProviderMethodInfo: Added ServiceKeys array to track keys per parameter, populated during PrepForInvocation()
• ServiceProviderMethodCaller: Updated CallMethodTryAsync() to resolve keyed services:
  • Optional: Cast to IKeyedServiceProvider and call GetKeyedService(Type, object?)
  • Required: Use extension method GetRequiredKeyedService(Type, object?)
  • Keyed service logic gated by #if NET8_0_OR_GREATER
• Tests: Added 6 tests covering keyed service scenarios with/without criteria, optional/required services

Usage

// Register keyed services
services.AddKeyedTransient<IEmailService, SendGridService>("sendgrid");
services.AddKeyedTransient<IEmailService, SmtpService>("smtp");

// Inject by key
[Create]
private void Create([Inject(Key = "sendgrid")] IEmailService emailService)
{
    // Gets SendGridService instance
}

[Fetch]
private void Fetch(int id, [Inject(Key = "smtp")] IEmailService emailService)
{
    // Gets SmtpService instance
}

// Optional keyed service
[Update]
private void Update([Inject(Key = "optional", AllowNull = true)] IService? service)
{
    // Returns null if key not registered
}

Fully backward compatible - existing [Inject] without keys work unchanged.

• Fixes Support keyed DI services in data portal parameter injection #4488

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