c# - 将时间跨度绑定(bind)到 slider

Question

我的程序中有一个间隔保存为 TimeSpan。我想将该值绑定(bind)到 Slider 以轻松调整 TimeSpan。我的计划是这样的，但它不起作用(它什么都不做):

编辑:根据答案更改了一些代码，但我仍然遇到同样的问题

public partial class MainWindow : Window, INotifyPropertyChanged
{

    ...

TimeSpan measure_gap = TimeSpan.FromSeconds(1); //init
public double Measure_gap 
{
    get
    {
        return measure_gap.TotalSeconds;
    }
    set
    {
        if (value != measure_gap.TotalSeconds)
        {
            measure_gap = TimeSpan.FromSeconds(value);
            OnPropertyChanged("Measure_gap");
        }
    }
}

public event PropertyChangedEventHandler PropertyChanged;

public void OnPropertyChanged(string propertyName)
{
    if (PropertyChanged != null)
        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}

这是我的绑定(bind)(我认为问题出在这里)

<Slider HorizontalAlignment="Left" Height="25" Margin="38,202,0,0" 
 VerticalAlignment="Top" Width="217" Minimum="1" Maximum="10" SmallChange="1" 
 Value="{Binding ElementName=MainWindow, Path=Measure_gap, Mode=TwoWay}"/>

所以我的问题是，我做错了什么 :-) 谢谢编辑:this..BindingContext = this

Answer 1

是的，问题是更改的值不会更新到绑定(bind)。在这里我详细说明一下，

public partial class MainWindow : Window, INotifyPropertyChanged
{

    TimeSpan measure_gap = TimeSpan.FromSeconds(1); //init
    public double Measure_gap
    {
        get
        {
            return measure_gap.TotalSeconds;
        }
        set
        {
            if (value != measure_gap.TotalSeconds)
            {
                measure_gap = TimeSpan.FromSeconds(value);
                OnPropertyChanged("Measure_gap");
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnPropertyChanged(string propertyName)
    {
        if(PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}