Wpf数据绑定到对象的properties属性[重复]

Question

所以我知道有很多数据绑定响应，但我找不到我要找的东西。或者我无法让它正常工作。

在我的例子中，我有一个类，它有两个属性类型 FootScan，如下所示：

public class ScanResult
{
    public FootScan LeftFoot { get; set; }
    public FootScan RightFoot { get; set; }

    public string Name { get; set; }

    ...
}

public class FootScan
{
    public string ImagePath { get; set; }

    public double FootLength { get; set; }

    ...
}

在我的窗口中，我有这个：

    public ScanResult CurrentScan
    {
        get { return (ScanResult)this.GetValue(CurrentScanProperty); }
        set { this.SetValue(CurrentScanProperty, value); }
    }

    public static readonly DependencyProperty CurrentScanProperty = DependencyProperty.Register(
      "CurrentScan", typeof(ScanResult), typeof(wndScanner), new PropertyMetadata(null));

在 Window_Loaded 上：

      CurrentScan = new ScanResult();
      CurrentScan.LeftFoot = new FootScan();
      CurrentScan.LeftFoot.FootLength = 285; //Normally comes from the scan result.

XAML 方面我想将我的文本块的文本属性绑定到 CurrentScan.LeftFoot.FootLength：

我试过了：

1-  <TextBlock x:Name="tbFootLength" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding CurrentScan.LeftFoot.FootLength}" VerticalAlignment="Top" Margin="10,0,0,0" FontFamily="Calibri" FontSize="15"/>
        


2-  <Grid x:Name="grdMeasures" DataContext="{Binding CurrentScan}" Margin="0,35,0,256" Background="#FFE7E7F3">

     <TextBlock x:Name="tbFootLength" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding LeftFoot.FootLength}" VerticalAlignment="Top" Margin="10,0,0,0" FontFamily="Calibri" FontSize="15"/>
   
    </Grid>       


3-   <Grid x:Name="grdMeasures" DataContext="{Binding CurrentScan.LeftFoot}" Margin="0,35,0,256" Background="#FFE7E7F3">

     <TextBlock x:Name="tbFootLength" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding FootLength}" VerticalAlignment="Top" Margin="10,0,0,0" FontFamily="Calibri" FontSize="15"/>
   
    </Grid>   

有什么想法吗？

谢谢。

Answer 1

如果CurrentScan 是定义TextBlock 的窗口的属性，则此绑定应该有效：

Text="{Binding CurrentScan.LeftFoot.FootLength, 
    RelativeSource={RelativeSource AncestorType=Window}}"

别忘了初始化CurrentScan属性，即设置它。