Question

我正在尝试使用 ComboBox 创建一个 UserControl，并绑定到 ItemSource 和 SelectedItem（我在 UserControl 中还有一些其他具有绑定功能的控件，但这些控件工作正常，已被删除以简化下面的代码）。< /p>

ItemSource 绑定似乎正在工作，并且 ComboBox 填充了 MainWindow 中指定的列表，但 SelectedItem 不会在任一方向发生变化时更新。尽管 VersionText 在 UserControl 之外的 SelectedSoftwareVersion.Version 更改时更新。

我可能在这里遗漏了一些基本的东西，但我看不到它。我对 UserControls 的经验有限。

SoftwareTile.xaml

<UserControl x:Class="MyApp.Controls.SoftwareTile"
             x:Name="softwareTile"
             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:MyApp.Controls"
             mc:Ignorable="d" 
             d:DesignHeight="100" d:DesignWidth="150">

    <Grid DataContext="{Binding RelativeSource={RelativeSource AncestorLevel=1, AncestorType={x:Type UserControl}, Mode=FindAncestor}}">

        <StackPanel>

            <TextBlock x:Name="VersionText"
                       Text="{Binding ElementName=softwareTile, Path=Version}"/>


            <TextBlock x:Name="VersionLabel"
                       Text="Version"/>

            <ComboBox x:Name="VersionSelect"
                      ItemsSource="{Binding ElementName=softwareTile, Path=VersionList}"
                      SelectedItem="{Binding ElementName=softwareTile, Path=VersionSelected}"/>

        </StackPanel>
            
    </Grid>

</UserControl>

SoftwareTile.cs

using System.Windows;
using System.Windows.Controls;
using System.Collections;
        
namespace MyApp.Controls
{

    public partial class SoftwareTile : UserControl
    {
        public static readonly DependencyProperty VersionProperty = DependencyProperty.Register("Version", typeof(string), typeof(SoftwareTile), new PropertyMetadata(string.Empty));
        public static readonly DependencyProperty VersionListProperty = DependencyProperty.Register("VersionList", typeof(IEnumerable), typeof(SoftwareTile), new UIPropertyMetadata(null));
        public static readonly DependencyProperty VersionSelectedProperty = DependencyProperty.Register("VersionSelected", typeof(object), typeof(SoftwareTile), new UIPropertyMetadata(null));

        public string Version
        {
            get { return (string)GetValue(VersionProperty); }
            set { SetValue(VersionProperty, value); }
        }

        public IEnumerable VersionList
        {
            get { return (IEnumerable)GetValue(VersionListProperty); }
            set { SetValue(VersionListProperty, value); }
        }

        public object VersionSelected
        {
            get { return (object)GetValue(VersionSelectedProperty); }
            set { SetValue(VersionSelectedProperty, value); }
        }
    }
}

主窗口.xaml

<uc:SoftwareTile x:Name="ST1"
                 Version="{Binding SelectedSoftwareVersion.Version}" 
                 VersionList="{Binding SoftwareVersions.VersionList}" 
                 VersionSelected="{Binding SelectedSoftwareVersion.Version, Mode=TwoWay}" />

WPF 绑定到 UserControl 中的 ComboBox

0 个答案: