Wpf 在MVVM中更新滑块值

最初，我在代码隐藏中有一个按钮事件

private async void SomeCommand(object sender, RoutedEventArgs e)
{
    MySlider.Value = MySlider.Value - 1;

在我的XAML中

 <Button Command="{Binding SomeCommand}">Do Something</Button>

---

我不知道方法

DoSomething

中的代码是什么？

如果要使用MVVM方法，应该使用可以绑定的属性

值。
您的xaml看起来像

<Slider x:Name="MySlider" Value="{Binding Value}" />
<Button Command="{Binding SomeCommand}">Do Something</Button>

public class MyViewModel : ViewModel
{
    private readonly ICommand someCommand;
    public MyViewModel()
    {
        this.someCommand = new DelegateCommand(this.DoSomething, this.CanDoSomething);
    }

    public ICommand SomeCommand
    {
        get { return this.someCommand; }
    }

    private void DoSomething(object state)
    {
        Value = Value - 1;
    }

    private bool CanDoSomething(object state)
    {
       //something like boundaries check of slider values and async is running and so on
    }

    private int _value;
    public int Value
    {
        get { return _value; }
        set 
        {
             if (_value != value)
             {
                 _value = value;
                 OnPropertyChanged(); //raise your propertyChanged event handler.
             }
        }
    }
}

public class MyViewModel : ViewModel
{
    private readonly ICommand someCommand;
    public MyViewModel()
    {
        this.someCommand = new DelegateCommand(this.DoSomething, this.CanDoSomething);
    }

    public ICommand SomeCommand
    {
        get { return this.someCommand; }
    }

    private void DoSomething(object state)
    {
        Value = Value - 1;
    }

    private bool CanDoSomething(object state)
    {
       //something like boundaries check of slider values and async is running and so on
    }

    private int _value;
    public int Value
    {
        get { return _value; }
        set 
        {
             if (_value != value)
             {
                 _value = value;
                 OnPropertyChanged(); //raise your propertyChanged event handler.
             }
        }
    }
}