C# WPF UserControl:集合绑定到所有实例?
我在WPF中看到了一个奇怪的行为,有多个UserControl实例。我正在尝试设置ComboBoxItems的集合,并将其绑定到UserControl的实例。但它却把所有的人都绑在上面,如下图所示。有人知道我如何更改代码,使项目显示在预期框中吗 非常感谢 窗口XamlC# WPF UserControl:集合绑定到所有实例?,c#,wpf,C#,Wpf,我在WPF中看到了一个奇怪的行为,有多个UserControl实例。我正在尝试设置ComboBoxItems的集合,并将其绑定到UserControl的实例。但它却把所有的人都绑在上面,如下图所示。有人知道我如何更改代码,使项目显示在预期框中吗 非常感谢 窗口Xaml <Window x:Class="WpfUserControlSample.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/p
<Window x:Class="WpfUserControlSample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfUserControlSample"
Title="MainWindow" Height="350" Width="525">
<StackPanel Orientation="Horizontal" Height="30">
<local:ToolbarButtonCombo x:Name="one" Text="Combo 1...">
<local:ToolbarButtonCombo.MenuItems>
<ComboBoxItem>Item 1</ComboBoxItem>
<ComboBoxItem>Item 2</ComboBoxItem>
</local:ToolbarButtonCombo.MenuItems>
</local:ToolbarButtonCombo>
<local:ToolbarButtonCombo x:Name="two" Text="Combo 2...">
<local:ToolbarButtonCombo.MenuItems>
<ComboBoxItem>Item 3</ComboBoxItem>
<ComboBoxItem>Item 4</ComboBoxItem>
</local:ToolbarButtonCombo.MenuItems>
</local:ToolbarButtonCombo>
<local:ToolbarButtonCombo x:Name="three" Text="Combo 3..."></local:ToolbarButtonCombo>
</StackPanel>
</Window>
<UserControl x:Class="WpfUserControlSample.ToolbarButtonCombo"
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"
mc:Ignorable="d"
d:DesignHeight="30"
Name="Control">
<StackPanel Orientation="Horizontal">
<Button Name="btn" Command="{Binding Path=ButtonCommand,ElementName=Control}">
<TextBlock Text="{Binding Path=Text, ElementName=Control, FallbackValue=Label}"></TextBlock>
</Button>
<ComboBox x:Name="cmb" Margin="0,0,0,0"
ItemsSource="{Binding Path=MenuItems,ElementName=Control}">
</ComboBox>
</StackPanel>
</UserControl>
项目1
项目2
项目3
项目4
用户控制Xaml
<Window x:Class="WpfUserControlSample.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfUserControlSample"
Title="MainWindow" Height="350" Width="525">
<StackPanel Orientation="Horizontal" Height="30">
<local:ToolbarButtonCombo x:Name="one" Text="Combo 1...">
<local:ToolbarButtonCombo.MenuItems>
<ComboBoxItem>Item 1</ComboBoxItem>
<ComboBoxItem>Item 2</ComboBoxItem>
</local:ToolbarButtonCombo.MenuItems>
</local:ToolbarButtonCombo>
<local:ToolbarButtonCombo x:Name="two" Text="Combo 2...">
<local:ToolbarButtonCombo.MenuItems>
<ComboBoxItem>Item 3</ComboBoxItem>
<ComboBoxItem>Item 4</ComboBoxItem>
</local:ToolbarButtonCombo.MenuItems>
</local:ToolbarButtonCombo>
<local:ToolbarButtonCombo x:Name="three" Text="Combo 3..."></local:ToolbarButtonCombo>
</StackPanel>
</Window>
<UserControl x:Class="WpfUserControlSample.ToolbarButtonCombo"
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"
mc:Ignorable="d"
d:DesignHeight="30"
Name="Control">
<StackPanel Orientation="Horizontal">
<Button Name="btn" Command="{Binding Path=ButtonCommand,ElementName=Control}">
<TextBlock Text="{Binding Path=Text, ElementName=Control, FallbackValue=Label}"></TextBlock>
</Button>
<ComboBox x:Name="cmb" Margin="0,0,0,0"
ItemsSource="{Binding Path=MenuItems,ElementName=Control}">
</ComboBox>
</StackPanel>
</UserControl>
用户控制代码隐藏
namespace WpfUserControlSample
{
/// <summary>
/// Interaction logic for ToolbarButtonCombo.xaml
/// </summary>
public partial class ToolbarButtonCombo : UserControl
{
public ToolbarButtonCombo()
{
InitializeComponent();
}
public static readonly DependencyProperty ButtonCommandProperty =
DependencyProperty.Register("ButtonCommand", typeof(ICommand), typeof(ToolbarButtonCombo));
public ICommand ButtonCommand
{
get { return (ICommand)GetValue(ButtonCommandProperty); }
set { SetValue(ButtonCommandProperty,value);}
}
public static readonly DependencyProperty MenuItemsProperty =
DependencyProperty.Register("MenuItems", typeof(ObservableCollection<ComboBoxItem>),
typeof(ToolbarButtonCombo), new FrameworkPropertyMetadata(new ObservableCollection<ComboBoxItem>()));
public ObservableCollection<ComboBoxItem> MenuItems
{
get { return (ObservableCollection<ComboBoxItem>)GetValue(MenuItemsProperty); }
set { SetValue(MenuItemsProperty, value); }
}
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof(string), typeof(ToolbarButtonCombo));
public string Text
{
get { return (string) GetValue(TextProperty);}
set { SetValue(TextProperty, value); }
}
}
}
命名空间WpfUserControlSample
{
///
///ToolbarButtonCombo.xaml的交互逻辑
///
公共部分类ToolbarButtonCombo:UserControl
{
公共工具栏按钮mbo()
{
初始化组件();
}
公共静态只读从属属性ButtonCommandProperty=
DependencyProperty.Register(“ButtonCommand”、typeof(ICommand)、typeof(Toolbar ButtonCombo));
公用ICommand按钮命令
{
获取{return(ICommand)GetValue(ButtonCommandProperty);}
set{SetValue(ButtonCommandProperty,value);}
}
公共静态只读从属属性菜单项属性=
DependencyProperty.Register(“菜单项”),类型(ObservableCollection),
typeof(ToolbarButtonCombo),新的框架属性ymetadata(新的observedcollection());
公共可观测集合菜单项
{
get{return(ObservableCollection)GetValue(MenuItemsProperty);}
集合{SetValue(MenuItemsProperty,value);}
}
公共静态只读DependencyProperty TextProperty=
Register(“Text”、typeof(string)、typeof(ToolbarButtonCombo));
公共字符串文本
{
获取{return(string)GetValue(TextProperty);}
set{SetValue(TextProperty,value);}
}
}
}
您的MenuItems
属性错误
WPF中的集合属性应该是依赖属性,您需要为每个类实例(在构造函数中)创建一个新集合
您正在为控件的所有实例使用相同的observateCollection
实例(默认值),因此它们都共享相同的项