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Developing-Step-By-Step-Angular-DevExtreme-Creating-New-Person.md

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Creating a New Person

Next step is to create a modal to add a new item to phone book.

Add a CreatePerson Method to PersonAppService

We first define CreatePerson method in IPersonAppService interface:

Task CreatePerson(CreatePersonInput input);

Then we create CreatePersonInput DTO that defines parameters of the method:

public class CreatePersonInput
{
    [Required]
    [MaxLength(PersonConsts.MaxNameLength)]
    public string Name { get; set; }

    [Required]
    [MaxLength(PersonConsts.MaxSurnameLength)]
    public string Surname { get; set; }

    [EmailAddress]
    [MaxLength(PersonConsts.MaxEmailAddressLength)]
    public string EmailAddress { get; set; }
}

Then we add configuration for AutoMapper into CustomDtoMapper.cs like below:

configuration.CreateMap<CreatePersonInput, Person>();

CreatePersonInput is mapped to Person entity (comment out related line in CustomDtoMapper.cs and we will use mapping below). All properties are decorated with data annotation attributes to provide automatic validation. Notice that we use same consts defined in PersonConsts.cs in .Core.Shared project for MaxLength properties. After adding this class, you can remove consts from Person entity and use this new consts class.

public class PersonConsts
{
    public const int MaxNameLength = 32;
    public const int MaxSurnameLength = 32;
    public const int MaxEmailAddressLength = 255;
}

Here, the implementation of CreatePerson method:

public async Task CreatePerson(CreatePersonInput input)
{
    var person = ObjectMapper.Map<Person>(input);
    await _personRepository.InsertAsync(person);
}

A Person entity is created by mapping given input, then inserted to database. We used async/await pattern here. All methods in ASP.NET Zero startup project is async. It's advised to use async/await wherever possible.

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