Hands-On RESTful Web Services with ASP.NET Core 3

Asynchronous code in I/O bound operations

When we implement code in an asynchronous way we should ask ourselves if the underlying process involves any kind of I/O operation. If this is the case, we should proceed by using an asynchronous approach for that stack. For example, the Get operation of the ItemRepository class involves a query to the database:

namespace Catalog.Infrastructure.Repositories{    public class ItemRepository : IItemRepository    {        ..        public async Task<Item> GetAsync(Guid id)        {            var item = await _context.Items                .AsNoTracking()                .Where(x => x.Id == id)                .Include(x => x.Genre)                .Include(x => x.Artist).FirstOrDefaultAsync();            return item;        }        ...    }}

In this case, we are using the FirstOrDefaultAsync method to execute the operation in ...