C# (CSharp) IHealthService.GetConditionsAffectedByWeatherAsync示例

示例#1

文件： WeatherStationViewModel.cs 项目： abbottdev/WeatherStation

        public WeatherStationViewModel(AppViewModel screen, Core.Locations.Location location, IWeatherService service, IHealthService healthService)
        {
            this.HostScreen = screen;
            this.service    = service;
            this.location   = location;

#if DEBUG
            if ((bool)(DesignerProperties.IsInDesignModeProperty.GetMetadata(typeof(DependencyObject)).DefaultValue))
            {
            }
            else
            {
#endif

            this.refreshTodaysWeather  = ReactiveCommand.CreateFromTask(async() => await service.GetTodaysWeatherAsync(location));
            this.todaysWeatherProperty = this.refreshTodaysWeather.Select(weather => new TodaysForecastModel(weather, screen, service)).ToProperty(this, vm => vm.Today);

            this.forecastCommand = ReactiveCommand.CreateFromTask(async() =>
            {
                var forecasts = await service.GetWeatherForecastAsync(location);

                return(forecasts.Select(f => new DayForecastModel(f, screen, service)));
            });

            this.forecasts = this.forecastCommand.ToProperty(this, vm => vm.Forecasts);

            var refreshConditionsAffectedByWeatherCommand = ReactiveCommand.CreateFromTask(async(TodaysForecast weather) =>
            {
                var conditions = await healthService.GetConditionsAffectedByWeatherAsync(weather.WeatherCode, weather.Temperature);

                return(conditions.Select(c => new ConditionViewModel(screen, c.Id, c.Name, healthService)));
            });

            this.conditionsAffectedByWeatherProperty = refreshConditionsAffectedByWeatherCommand.ToProperty(this, vm => vm.ConditionsAffectedByWeather);

            this.refreshTodaysWeather.InvokeCommand(refreshConditionsAffectedByWeatherCommand);

            //Create a busy property to show the user we're busy doing something.
            Observable
            .CombineLatest(this.refreshTodaysWeather.IsExecuting, this.forecastCommand.IsExecuting, refreshConditionsAffectedByWeatherCommand.IsExecuting, (today, forecast, conditions) => today || forecast || conditions)
            .ToProperty(this, vm => vm.IsBusy, out this.isBusy);

            this.hasConditions = this.WhenAnyValue(vm => vm.ConditionsAffectedByWeather).Select(items => items != null && items.Count() > 0).ToProperty(this, vm => vm.HasConditionsAffectedByWeather);

            this.WhenNavigatedTo(() => Task.Run(async() =>
            {
                await this.refreshTodaysWeather.Execute();
                await this.forecastCommand.Execute();
            }));

#if DEBUG
        }
#endif
        }