# Core Interfaces

Quick reference for command and query handler interfaces.

## ICommandHandler

```csharp
// Command without result
public interface ICommandHandler<in TCommand> where TCommand : class
{
    Task HandleAsync(TCommand command, CancellationToken ct = default);
}

// Command with result
public interface ICommandHandler<in TCommand, TResult> where TCommand : class
{
    Task<TResult> HandleAsync(TCommand command, CancellationToken ct = default);
}
```

## IQueryHandler

```csharp
public interface IQueryHandler<in TQuery, TResult> where TQuery : class
{
    Task<TResult> HandleAsync(TQuery query, CancellationToken ct = default);
}
```

## See Also

- [API Reference Overview](README.md)
- [Commands Documentation](../core-features/commands/README.md)