WPF：如何在主窗口中使用用户控件的属性？

Question

我制作了一个有效的用户控件，并希望在主窗口中多次使用它。它具有标签中显示的属性结果。在我的主窗口中，我有一个标签，该标签应显示所有结果的总和。

这是用户控件（它起作用，很重要，我想使用一个属性结果）：

using System.ComponentModel;
using System.Windows;

namespace WpfApp2
{
    public partial class CardSelectionControl : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int Level
        {
            get { return (int)GetValue(LevelProperty); }
            set { SetValue(LevelProperty, value); }
        }
        public int SelectedIndex
        {
            get { return (int)GetValue(SelectedIndexProperty); }
            set { SetValue(SelectedIndexProperty, value); }
        }

        public int Result
        {
            get { return (int)GetValue(ResultProperty); }
            set { SetValue(ResultProperty, value); }
        }


        public static readonly DependencyProperty ResultProperty =
            DependencyProperty.Register("Result", typeof(int), typeof(CardSelectionControl), new PropertyMetadata(20));

        public static readonly DependencyProperty LevelProperty =
            DependencyProperty.Register("Level", typeof(int), typeof(CardSelectionControl), new PropertyMetadata(4, new PropertyChangedCallback(OnChanged)));

        public static readonly DependencyProperty SelectedIndexProperty =
            DependencyProperty.Register("SelectedIndex", typeof(int), typeof(CardSelectionControl), new PropertyMetadata(0));

        private static void OnChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            CardSelectionControl control = (CardSelectionControl)d;
            control.Recalculate();
        }

        public void Recalculate()
        {
            //calculates a new value for level
        }



        public CardSelectionControl()
        {
            DataContext = this;
            InitializeComponent();
        }
    }
}

此主窗口：

<Window x:Class="WpfApp2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp2" xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
        mc:Ignorable="d"
        Title="MainWindow">
    <StackPanel x:Name="panel1">
        <local:CardSelectionControl x:Name="control1" Result="{Binding Costs1}" ></local:CardSelectionControl>
        <local:CardSelectionControl x:Name="control2" Result="{Binding Costs2}" ></local:CardSelectionControl>

        <Label Height="50" Content="{Binding TotalCosts}"></Label>
    </StackPanel>
</Window>

它的代码背后：

using System.ComponentModel;
using System.Windows;

namespace WpfApp2
{
    public partial class MainWindow : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int Costs1
        {
            get { return (int)GetValue(CostsProperty); }
            set { SetValue(CostsProperty, value); }
        }

        public static readonly DependencyProperty CostsProperty =
            DependencyProperty.Register("Costs1", typeof(int), typeof(CardSelectionControl), new PropertyMetadata(0));

        public int Costs2
        {
            get { return (int)GetValue(Costs2Property); }
            set { SetValue(Costs2Property, value); }
        }

        public static readonly DependencyProperty Costs2Property =
            DependencyProperty.Register("Costs2", typeof(int), typeof(CardSelectionControl), new PropertyMetadata(0));



        public int TotalCosts
        {
            get { return (int)GetValue(TotalCostsProperty); }
            set { SetValue(TotalCostsProperty, value); }
        }

        public static readonly DependencyProperty TotalCostsProperty =
            DependencyProperty.Register("TotalCosts", typeof(int), typeof(MainWindow), new PropertyMetadata(0));



        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }
    }
}

我如何绑定到结果？成本1和成本2没有价值。 以及如何将这些绑定结合并将其结合到标签上？我考虑过创建一种方法calctotal（）并为每个成本属性实现新的属性changedcallback，这是可能的吗？

Answer 1

我认为您应该使用其他绑定：

Result="{Binding Costs1, RelativeSource={RelativeSource AncestorType={x:Type Window}}}

或使用x：name =“ mainwindow” window 元素和

Result="{Binding Costs1, ElementName=MainWindow}