获取电池信息报告更新MVVM窗口10

本文关键字：MVVM 窗口 更新 报告 信息 获取 | 更新日期: 2023-09-27 18:14:28

我可以从ViewModel中调用reportUpdated事件吗？

<code>
        public MainPage() 
        { 
            this.InitializeComponent(); 
            Battery.AggregateBattery.ReportUpdated += AggregateBattery_ReportUpdated; 
        } 
 </code>

这里有一个如何做这项工作的明确例子。问题是如何使用MVVM 实现此功能

获取电池信息报告更新MVVM窗口10

几个选项。。。

  1. 将事件处理程序附加到VM内部，而不是使用代码隐藏。编辑：正如评论中所指出的，这不是有史以来最干净的MVVM解决方案。一个更干净的方法是在VM中拥有某种独立于平台的接口(IAggregateBattery(，并通过构造函数注入提供平台实现
  2. 从AggregateBattery_ReportUpdated调用VM上的方法
  3. 当事件发生时，使用某种信使发送带有事件信息的消息(MVVM Light有，其他框架可能也有(

我找到了解决方案：

在构造函数中我的ViewModel

    <code>
    public MainViewModel()
    {
    //The firs time, launch to method for get the current status battery
            this.RequestAggregateBatteryReport();
    // This event is launch each time, when the status battery change
            Battery.AggregateBattery.ReportUpdated += AggregateBattery_ReportUpdated1;
        }
        private async void AggregateBattery_ReportUpdated1(Battery sender, object args)
            {
    //The Dispatcher is used when in other thread because is important use the other thread for avoid issue.
Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
                () =>
                {
                    RequestAggregateBatteryReport();
                });
        }
   private void RequestAggregateBatteryReport()
        {
            // Create aggregate battery object
            var aggBattery = Battery.AggregateBattery;
            // Get report
            var report = aggBattery.GetReport();
            // Update UI
            AddReportUI(report, aggBattery.DeviceId);
        }
        private void AddReportUI(BatteryReport report, string DeviceID)
        {
            this.BatteryEnergy = new BatteryEnergy();
            // Disable progress bar if values are null
            if ((report.FullChargeCapacityInMilliwattHours == null) ||
                (report.RemainingCapacityInMilliwattHours == null))
            {
                this.BatteryEnergy.ProgressBarMaxium = 0.0;
                this.BatteryEnergy.ProgressBarValue = 0.0;
                this.BatteryEnergy.ProgressBarPorcent = "N/A";
            }
            else
            {

                this.BatteryEnergy.ProgressBarMaxium = Convert.ToDouble(report.FullChargeCapacityInMilliwattHours);
                this.BatteryEnergy.ProgressBarValue = Convert.ToDouble(report.RemainingCapacityInMilliwattHours);
                this.BatteryEnergy.ProgressBarPorcent = ((Convert.ToDouble(report.RemainingCapacityInMilliwattHours) / Convert.ToDouble(report.FullChargeCapacityInMilliwattHours)) * 100).ToString("F2") + "%";
            }
        }

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