EmptyMauiApp/MauiApp/Core/RestClient/ApiRestClient.cs

using System.Net;
using System.Text;
using System.Text.Json;
using MauiApp.Core.Converter;
using MauiApp.Core.RestClient.Contracts;

namespace MauiApp.Core.RestClient;

public abstract class ApiRestClient : IApiRestClient
{
    public string BaseUrl { get; init; }

    public static readonly JsonSerializerOptions JsonSerializerOptions = new()
    {
        
        Converters =
        {
            new DateTimeConverter(),
            new NullableDateTimeConverter(),
        }
    };


    public async Task<T> Get<T>(string url, IDictionary<string, object> queryParams = null, HttpClient httpClient = null)
    {
        queryParams ??= new Dictionary<string, object>();

        var queryParamString = string.Join("&",
            queryParams.Select(kvp =>
                $"{kvp.Key}={kvp.Value}"));

        httpClient ??= new HttpClient();
        httpClient.BaseAddress = new Uri(BaseUrl);

        T response = default;
        try
        {
            var content = await httpClient.GetStreamAsync($"{url}?{queryParamString}");

            response = await JsonSerializer.DeserializeAsync<T>(content, JsonSerializerOptions);
        }
        catch (Exception ex)
        {
            throw new Exception("Errore interno " + ex + response);
        }
        finally
        {
            httpClient.Dispose();
        }

        return response;
    }

    public async Task<T> Post<T>(string url, object body, IDictionary<string, object> queryParams = null, HttpClient httpClient = null)
    {
        queryParams ??= new Dictionary<string, object>();

        var queryParamString = string.Join("&",
            queryParams.Select(kvp =>
                $"{kvp.Key}={kvp.Value}"));

        httpClient ??= new HttpClient();
        httpClient.BaseAddress = new Uri(BaseUrl);

        var jsonBody = JsonSerializer.Serialize(body, JsonSerializerOptions);
        var content = new StringContent(jsonBody, Encoding.UTF8, "application/json");

        HttpResponseMessage response = await httpClient.PostAsync($"{url}?{queryParamString}", content);

        if (response.StatusCode != HttpStatusCode.OK)
            throw new Exception(response.ReasonPhrase);

        var jsonResponse = await response.Content.ReadAsStreamAsync();

        var result = await JsonSerializer.DeserializeAsync<T>(jsonResponse, JsonSerializerOptions);

        httpClient.Dispose();

        return result;
    }
}