问ASP.NET Core中的异步

EN

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;

namespace PatientManagement.Models
{
    public class PatientService : IPatientService
    {
        private List<Patient> patients;

        public PatientService()
        {
            patients = new List<Patient>()
            {
                new Patient(){ ID = 1, Name = "Akash", Email = "aakash1027@gmail.com" },
                new Patient(){ ID = 2, Name = "John", Email = "John@gmail.com" },
                new Patient(){ ID = 3, Name = "Mike", Email = "Mike@gmail.com" },
            };
        }

        public async Task<Patient> GetPatient(int id)
        {
            return await patients.FirstOrDefaultAsync(x => x.ID == id);
        }
    }
}