WPF MVVM 从 BackgroundWorker 更新 UI 绑定属性

使用WPF MVVM模式时，我们经常需要在后台线程中执行一些耗时的操作，然后将结果更新到UI绑定的属性中。为了实现这一目标，我们可以使用BackgroundWorker来处理后台操作，并通过数据绑定机制将结果同步到UI界面上。

csharp
private double _number1;
public double Number1
{
    get { return _number1; }
    set
    {
        if (_number1 != value)
        {
            _number1 = value;
            OnPropertyChanged(nameof(Number1));
        }
    }
}
private double _number2;
public double Number2
{
    get { return _number2; }
    set
    {
        if (_number2 != value)
        {
            _number2 = value;
            OnPropertyChanged(nameof(Number2));
        }
    }
}
private double _result;
public double Result
{
    get { return _result; }
    set
    {
        if (_result != value)
        {
            _result = value;
            OnPropertyChanged(nameof(Result));
        }
    }
}

csharp
private ICommand _calculateCommand;
public ICommand CalculateCommand
{
    get
    {
        if (_calculateCommand == null)
        {
            _calculateCommand = new RelayCommand(() =>
            {
                BackgroundWorker worker = new BackgroundWorker();
                worker.DoWork += (sender, e) =>
                {
                    // 执行计算操作
                    double result = Number1 + Number2;
                    // 将结果赋值给Result属性
                    Result = result;
                };
                worker.RunWorkerAsync();
            });
        }
        return _calculateCommand;
    }
}

xaml