编辑：

Question

我正在尝试将UserControl绑定到UserControl本身定义的依赖项属性，但我一直收到绑定错误：

BindingExpression路径错误：'DefinitionTypeResourceKeyProperty' 在'object'''DefinitionsList'（Name =''）'上找不到属性。 BindingExpression：路径= DefinitionTypeResourceKeyProperty; DataItem ='DefinitionsList'（Name =''）;目标元素是'ItemsControl' （名称= ''）; target属性是'ItemTemplate'（类型'DataTemplate'）

这是我的xaml：

<UserControl x:Class="Editor.Common.DefinitionsList"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:Editor.Common"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <local:StringToResourceConverter x:Key="StringToResource" />
    </UserControl.Resources>
    <Expander>
        <Expander.ContextMenu>
            <ContextMenu>
                <MenuItem Header="Add"
                              Command="{Binding AddItem}" />
                <MenuItem Header="Remove"
                              Command="{Binding RemoveItem}" CommandParameter="{Binding SelectedItem}" />
            </ContextMenu>
        </Expander.ContextMenu>

        <Grid>
            <ItemsControl ItemsSource="{Binding Items}" ItemTemplate="{Binding DefinitionTypeResourceKeyProperty, Converter={StaticResource StringToResource}, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}">
            </ItemsControl>
        </Grid>
    </Expander>
</UserControl>

这是它的.cs文件：

using System.Windows;
using System.Windows.Controls;

namespace Editor.Common
{
    public partial class DefinitionsList : UserControl
    {
        public string DefinitionTypeResourceKey
        {
            get { return (string)GetValue(DefinitionTypeResourceKeyProperty); }
            set { SetValue(DefinitionTypeResourceKeyProperty, value); }
        }

        public static readonly DependencyProperty DefinitionTypeResourceKeyProperty =
            DependencyProperty.Register("DefinitionTypeResourceKey", typeof(string), typeof(DefinitionsList));

        public string Header
        {
            get { return (string)GetValue(HeaderProperty); }
            set { SetValue(HeaderProperty, value); }
        }

        public static readonly DependencyProperty HeaderProperty =
            DependencyProperty.Register("Header", typeof(string), typeof(DefinitionsList));

        public DefinitionsList()
        {
            InitializeComponent();
        }
    }
}

我将此控件用作通用列表控件，因此我可以在此列表中添加不同类型的控件这就是我尝试将它用于特定类型的控件：

<UserControl x:Class="Editor.Item.ItemEditorControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:Editor.Item"
             xmlns:component="clr-namespace:Editor.Component"
             xmlns:common="clr-namespace:Editor.Common"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <DataTemplate x:Key="compListTemplate">
            <component:ComponentListEditorControl />
        </DataTemplate>
    </UserControl.Resources>
    <common:DefinitionsList Header="{Binding Name}" DefinitionTypeResourceKey="compListTemplate" />
</UserControl>

及其.cs文件：

使用System.Windows.Controls;

namespace Editor.Item
{
    public partial class ItemEditorControl : UserControl
    {
        public ItemEditorControl()
        {
            InitializeComponent();
            DataContext = new ItemDefinitionViewModel();
        }
    }
}

为什么我收到此错误？

编辑：

我正在添加ItemDefinitionViewModel代码：

using Editor.Common;

namespace Editor.Item
{
    public class ItemDefinitionViewModel : BaseViewModel<ItemEditorItem>
    {
        public ItemDefinitionViewModel()
        {

        }
    }
}

及其基类：

using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows.Input;

namespace Editor.Common
{
    public class BaseViewModel<T> : INotifyPropertyChanged
                    where T : new()
    {
        public event PropertyChangedEventHandler PropertyChanged;


        public ICommand AddItem { get; private set; }
        public ICommand RemoveItem { get; private set; }

        public ObservableCollection<T> Items { get; private set; }

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

        public BaseViewModel()
        {
            Items = new ObservableCollection<T>();
            AddItem = new RelayCommand(addItem);
            RemoveItem = new RelayCommand(removeItem);
        }

        private void removeItem(object obj)
        {
            T removedItem = (T)obj;
            Items.Remove(removedItem);
        }

        private void addItem(object obj)
        {
            T newItem = new T();
            Items.Add(newItem);
        }
    }
}

Answer 1

绑定到DefinitionTypeResourceKeyProperty而不是DefinitionTypeResourceKey。您尝试绑定到DP定义而不是DP。

＆＃34;烦恼＆＃34;我是你在RelativeSource RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}中寻找UserControl。

相反，您应该寻找DefinitionsList。如果你改变了，编辑会告诉你你在DP名称上犯了错误，节省你的时间。

尝试绑定到同一用户控件的依赖项属性时出错

编辑：

1 个答案: