Abp Infrastructure

public class MySettingDefinitionProvider : SettingDefinitionProvider
{
    public override void Define(ISettingDefinitionContext context)
    {
        context.Add(
            new SettingDefinition("MyApp.MaxItemCount", "10"),
            new SettingDefinition("MyApp.EnableFeature", "false"),
            new SettingDefinition("MyApp.SecretKey", isEncrypted: true)
        );
    }
}

public class MyService : ITransientDependency
{
    private readonly ISettingProvider _settingProvider;

    public async Task DoSomethingAsync()
    {
        var maxCount = await _settingProvider.GetAsync<int>("MyApp.MaxItemCount");
        var isEnabled = await _settingProvider.IsTrueAsync("MyApp.EnableFeature");
    }
}

public class MyFeatureDefinitionProvider : FeatureDefinitionProvider
{
    public override void Define(IFeatureDefinitionContext context)
    {
        var myGroup = context.AddGroup("MyApp");

        myGroup.AddFeature(
            "MyApp.PdfReporting",
            defaultValue: "false",
            valueType: new ToggleStringValueType()
        );

        myGroup.AddFeature(
            "MyApp.MaxProductCount",
            defaultValue: "10",
            valueType: new FreeTextStringValueType(new NumericValueValidator(1, 1000))
        );
    }
}

[RequiresFeature("MyApp.PdfReporting")]
public async Task<PdfReportDto> GetPdfReportAsync()
{
    // Only executes if feature is enabled
}

// Or programmatically
if (await _featureChecker.IsEnabledAsync("MyApp.PdfReporting"))
{
    // Feature is enabled for current tenant
}

var maxCount = await _featureChecker.GetAsync<int>("MyApp.MaxProductCount");

public class BookService : ITransientDependency
{
    private readonly IDistributedCache<BookCacheItem> _cache;
    private readonly IClock _clock;

    public BookService(IDistributedCache<BookCacheItem> cache, IClock clock)
    {
        _cache = cache;
        _clock = clock;
    }

    public async Task<BookCacheItem> GetAsync(Guid bookId)
    {
        return await _cache.GetOrAddAsync(
            bookId.ToString(),
            async () => await GetBookFromDatabaseAsync(bookId),
            () => new DistributedCacheEntryOptions
            {
                AbsoluteExpiration = _clock.Now.AddHours(1)
            }
        );
    }
}

[CacheName("Books")]
public class BookCacheItem
{
    public string Name { get; set; }
    public decimal Price { get; set; }
}

// Event class
public class OrderCreatedEvent
{
    public Order Order { get; set; }
}

// Handler
public class OrderCreatedEventHandler : ILocalEventHandler<OrderCreatedEvent>, ITransientDependency
{
    public async Task HandleEventAsync(OrderCreatedEvent eventData)
    {
        // Handle within same transaction
    }
}

// Publish
await _localEventBus.PublishAsync(new OrderCreatedEvent { Order = order });

// Event Transfer Object (in Domain.Shared)
[EventName("MyApp.Order.Created")]
public class OrderCreatedEto
{
    public Guid OrderId { get; set; }
    public string OrderNumber { get; set; }
}

// Handler
public class OrderCreatedEtoHandler : IDistributedEventHandler<OrderCreatedEto>, ITransientDependency
{
    public async Task HandleEventAsync(OrderCreatedEto eventData)
    {
        // Handle distributed event
    }
}

// Publish
await _distributedEventBus.PublishAsync(new OrderCreatedEto { ... });

public class EmailSendingArgs
{
    public string EmailAddress { get; set; }
    public string Subject { get; set; }
    public string Body { get; set; }
}

public class EmailSendingJob : AsyncBackgroundJob<EmailSendingArgs>, ITransientDependency
{
    private readonly IEmailSender _emailSender;

    public EmailSendingJob(IEmailSender emailSender)
    {
        _emailSender = emailSender;
    }

    public override async Task ExecuteAsync(EmailSendingArgs args)
    {
        await _emailSender.SendAsync(args.EmailAddress, args.Subject, args.Body);
    }
}

await _backgroundJobManager.EnqueueAsync(
    new EmailSendingArgs
    {
        EmailAddress = "user@example.com",
        Subject = "Hello",
        Body = "..."
    },
    delay: TimeSpan.FromMinutes(5) // Optional delay
);

[LocalizationResourceName("MyModule")]
public class MyModuleResource { }

{
  "culture": "en",
  "texts": {
    "HelloWorld": "Hello World!",
    "Menu:Books": "Books"
  }
}