WPF数据列为结构化数据属性

Question

如何将数据上下文的儿童财产注册为依赖属性？

在下种情况下，我想将两个属性“欧盟”和“模拟”注册为模拟输入的依赖关系属性。这两个属性是缩放类的一部分，这是数据上下文AI类的一部分。我该怎么做？

在XAML侧：

<TextBlock Text="{Binding EU, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:AnalogInput}}}"
                                                       FontSize="11" FontFamily="Verdana" Foreground="Black" HorizontalAlignment="Center" VerticalAlignment="Center" />

背后的代码：

public class AnalogInput : BaseUserDynamo
{
    public static readonly DependencyProperty EUProperty = DependencyProperty.Register("EU", typeof(float), typeof(Scaling));
    public static readonly DependencyProperty UnitProperty = DependencyProperty.Register("Unit", typeof(string), typeof(AnalogInput));
    public static readonly DependencyProperty SimulateProperty = DependencyProperty.Register("Simulate", typeof(bool), typeof(Scaling));
    public static readonly DependencyProperty ResolutionProperty = DependencyProperty.Register("Resolution", typeof(int), typeof(AnalogInput));

    static AnalogInput()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(AnalogInput), new FrameworkPropertyMetadata(typeof(AnalogInput)));
    }

    public AnalogInput()
    {
        try
        {
            AI myAI = new AI();
            DataContext = myAI;
            myAI.PropertyChanged += MyObj_PropertyChanged;
      
        }
        catch (Exception)
        {
            throw;
        }

    }
}

缩放是AI类的一部分。

internal class AI : PLCBaseObject
{
    private Scaling _ScaleIn;
    private string _Unit;
    private int _Resolution;

    public Scaling ScaleIn { get { return _ScaleIn; } set { if (value != _ScaleIn) { _ScaleIn = value; OnPropertyChanged(); } } }
    public string Unit { get { return _Unit; } set { if (value != _Unit) { _Unit = value; OnPropertyChanged(); } } }
    public int Resolution { get { return _Resolution; } set { if (value != _Resolution) { _Resolution = value; OnPropertyChanged(); } } }
}

缩放类具有许多属性。

public class Scaling : PLCBaseObject
{
    private bool _Simulate;
    private float _EU;

    public bool Simulate { get { return _Simulate; } set { if (value != _Simulate) { _Simulate = value; OnPropertyChanged(); } } }
    public float EU { get { return _EU; } set { if (value != _EU) { _EU = value; OnPropertyChanged(); } } }

}

Answer 1

您要么使用depentencyProperty仿真property或_模拟字段。你不能两者都混合。依赖关系不与_示例字段同步。

// class Scaling 
public static readonly DependencyProperty SimulateProperty = DependencyProperty.Register(
        "Simulate", typeof(bool), typeof(Scaling), new PropertyMetadata(default(bool)));

public bool Simulate {
    get { return (bool) GetValue(SimulateProperty); }
    set { SetValue(SimulateProperty, value); }
}

如果您的DataContext是AI，则AI类必须从依赖项对象派生。否则模拟input可以容纳依赖项，但是您必须自己同步值（复制缩放值。模拟以模拟property），因此模拟插图充当包装器。

// class AnalogInput
public static readonly DependencyProperty SimulateProperty = DependencyProperty.Register(
        "Simulate", typeof(bool), typeof(AnalogInput), new PropertyMetadata(default(bool)));

public bool Simulate {
    get { return (bool) GetValue(SimulateProperty); }
    set { SetValue(SimulateProperty, value); }
}