Program.cs

using Mailtrap;
using Mailtrap.Accounts;
using Mailtrap.Contacts;
using Mailtrap.Contacts.Models;
using Mailtrap.Contacts.Requests;
using Mailtrap.Contacts.Responses;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;


HostApplicationBuilder hostBuilder = Host.CreateApplicationBuilder(args);

IConfigurationSection config = hostBuilder.Configuration.GetSection("Mailtrap");

hostBuilder.Services.AddMailtrapClient(config);

using IHost host = hostBuilder.Build();

ILogger<Program> logger = host.Services.GetRequiredService<ILogger<Program>>();
IMailtrapClient mailtrapClient = host.Services.GetRequiredService<IMailtrapClient>();

try
{
    var accountId = 12345;
    IAccountResource accountResource = mailtrapClient.Account(accountId);

    var contactEmail = "example@mailtrap.io";

    // Get resource for contacts collection
    IContactCollectionResource contactsResource = accountResource.Contacts();

    // Get all contacts for account
    // TODO: Enable when GetAll is implemented
    IList<Contact> contacts = /*await contactsResource.GetAll()*/ [];

    Contact? contact = contacts
        .FirstOrDefault(p => string.Equals(p.Email, contactEmail, StringComparison.OrdinalIgnoreCase));


    if (contact is null)
    {
        logger.LogWarning("No contact found. Creating.");

        // Create contact
        var createContactRequest = new CreateContactRequest(contactEmail);
        createContactRequest.Fields.Add("first_name", "John");
        createContactRequest.Fields.Add("last_name", "Doe");
        CreateContactResponse createContactResponse = await contactsResource.Create(createContactRequest);
        contact = createContactResponse.Contact;
    }
    else
    {
        logger.LogInformation("Contact found.");
    }

    // Get resource for specific contact
    IContactResource contactResource = accountResource.Contact(contact.Id);

    // Get details
    ContactResponse contactResponse = await contactResource.GetDetails();
    Contact contactDetails = contactResponse.Contact;
    logger.LogInformation("Contact: {Contact}", contactDetails);

    // Update contact details
    var updateContactRequest = new UpdateContactRequest("test@mailtrap.io");
    UpdateContactResponse updateContactResponse = await contactResource.Update(updateContactRequest);
    Contact updatedContact = updateContactResponse.Contact;
    logger.LogInformation("Updated Contact: {Contact}", updatedContact);

    // Delete contact
    // Beware that contact resource becomes invalid after deletion and should not be used anymore
    await contactResource.Delete();
    logger.LogInformation("Contact Deleted.");
}
catch (Exception ex)
{
    logger.LogError(ex, "An error occurred during API call.");
    Environment.FailFast(ex.Message);
    throw;
}