ClientApiPoC/ApiClient/MainWindowViewModel.cs

using ClientApiPoC.Shared;
using ClientApiPoC.Shared.Models;
using ClientApiPoC.Shared.Wpf;
using CommunityToolkit.Mvvm.Input;
using System.Net.Http;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Windows.Input;

namespace ClientApiPoC.ApiClient {
    public class MainWindowViewModel : BaseViewModel {
        #region Properties
        private string _apiServiceUrl = "http://localhost:5228/";
        public string ApiServiceUrl {
            get => _apiServiceUrl;
            set {
                _apiServiceUrl = value;
                OnPropertyChanged(nameof(ApiServiceUrl));
            }
        }

        private bool _isFetchingData = false;
        public bool IsFetchingData {
            get => _isFetchingData;
            set {
                _isFetchingData = value;
                OnPropertyChanged(nameof(IsFetchingData));
                OnPropertyChanged(nameof(ControlsEnabled));
            }
        }

        public bool ControlsEnabled => !this.IsFetchingData;

        private ExampleRequestResultModel? _requestResultData = null;
        public ExampleRequestResultModel? RequestResultData {
            get => _requestResultData;
            set {
                _requestResultData = value;
                OnPropertyChanged(nameof(RequestResultData));
                OnPropertyChanged(nameof(RequestResultDataString));
            }
        }

        public string RequestResultDataString {
            get {
                if (this.RequestResultData == null) return "NULL";
                var options = new JsonSerializerOptions() {
                    IndentCharacter = ' ',
                    IndentSize = 2,
                    NewLine = "\n",
                    WriteIndented = true
                };
                return JsonSerializer.Serialize(this.RequestResultData, options);
            }
        }
        #endregion

        #region Commands
        public ICommand HttpGetButtonCommand { get; }
        #endregion

        public MainWindowViewModel() {
            this.HttpGetButtonCommand = new AsyncRelayCommand(HttpGetButtonActionAsync);
        }

        private async Task HttpGetButtonActionAsync() {
            if (this.IsFetchingData) return;
            try {
                this.IsFetchingData = true;
                var url = this.ApiServiceUrl;
                if (string.IsNullOrWhiteSpace(url)) throw new InvalidOperationException("No base url specified.");
                while (url.EndsWith('/')) url = url[..^1];
                url += Routes.EXAMPLE_REQUEST;
                using (var httpClient = Tools.CreateHttpClient()) {
                    var request = new HttpRequestMessage(HttpMethod.Get, url);
                    var response = await httpClient.SendAsync(request);
                    response.EnsureSuccessStatusCode();
                    var responseString = await response.Content.ReadAsStringAsync();
                    var options = new JsonSerializerOptions() {
                        PropertyNameCaseInsensitive = true
                    };
                    var result = JsonSerializer.Deserialize<ExampleRequestResultModel>(responseString, options);
                    this.RequestResultData = result;
                }
            } catch (Exception ex) {
                await HandleErrorAsync(ex);
            } finally {
                this.IsFetchingData = false;
            }
        }
    }
}