User2049598883 posted
I have made a blazor application, which can save data into database, however I am having trouble understanding how each part of my implementation wroks.
1. In my blazor page I am injecting ITagRepository , so does it mean that app starts
2. with blazor page -> where code line tagRepository.CreateTag(Tag) runs
3. this code line uses ITagRepository
4. which implements TagsRepository, and this TagRepository
contains code line :
private string url = "api/tags";
5. so this line activates controller which does the job?
Is it a correct order? If yes, what happens at this line below from TagRepository?
var response = await httpService.Post(url, tag);
The whole code is below.
//1. Blazor page:
@page "/tags"
@inject ITagRepository tagRepository
<h3>Tags</h3>
<TagForm Tag="Tag" OnValidSubmit="Create" />
@code {
Tag Tag = new Tag();
private async Task Create()
{
try
{
await tagRepository.CreateTag(Tag);
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.WriteLine("Creating tag..");
}
}
//2. ITagRepository:
public interface ITagRepository
{
Task CreateTag(Tag tag);
}
//3. TagRepository:
public class TagRepository : ITagRepository
{
private readonly IHttpService httpService;
private string url = "api/tags";
public TagRepository(IHttpService httpService)
{
this.httpService = httpService;
}
public async Task CreateTag(Tag tag)
{
var response = await httpService.Post(url, tag);
if (!response.Success)
{
throw new ApplicationException();
}
}
}
//4. Controller
[ApiController]
[Route("api/tags")]
public class TagController:ControllerBase
{
private readonly ApplicationDbContext context;
public TagController(ApplicationDbContext context)
{
this.context = context;
}
[HttpPost]
public async Task<ActionResult<int>> Post(Tag tag)
{
context.Add(tag);
await context.SaveChangesAsync();
return tag.Id;
}
}
// 5. IHttpService
public class HttpService:IHttpService
{
private readonly HttpClient httpClient;
public HttpService(HttpClient httpClient)
{
this.httpClient = httpClient;
}
public async Task<HttpResponseWrapper<object>> Post<T>(string url, T data)
{
var dataJson = JsonSerializer.Serialize(data);
var stringContent = new StringContent(dataJson, Encoding.UTF8, "application/json");
var response = await httpClient.PostAsync(url, stringContent);
return new HttpResponseWrapper<object>(null, response.IsSuccessStatusCode, response);
}
}
