C# 如何绑定MenuFlyout“;itemsource";当页面上有多个弹出按钮时是否使用collection?
我有一个gridview,每个gridview项目上都有一个弹出式菜单。由于我需要将每个弹出菜单的ItemsSource绑定到一个集合,所以这一点很复杂。由于默认情况下menuflyout没有ItemsSource属性,因此我尝试使用Jerry Nixon在此处发布的解决方案: 当我第一次单击gridview项目时,一切正常。但是,当我单击另一个gridview项目时,我得到以下错误:“元素已经是另一个元素的子元素。” 我猜Visual Studio正在抱怨,因为当我单击下一个网格项时,弹出式菜单已经附加到第一个网格项,并且它试图重用数据模板。有人能帮忙吗 XAML:C# 如何绑定MenuFlyout“;itemsource";当页面上有多个弹出按钮时是否使用collection?,c#,xaml,uwp,C#,Xaml,Uwp,我有一个gridview,每个gridview项目上都有一个弹出式菜单。由于我需要将每个弹出菜单的ItemsSource绑定到一个集合,所以这一点很复杂。由于默认情况下menuflyout没有ItemsSource属性,因此我尝试使用Jerry Nixon在此处发布的解决方案: 当我第一次单击gridview项目时,一切正常。但是,当我单击另一个gridview项目时,我得到以下错误:“元素已经是另一个元素的子元素。” 我猜Visual Studio正在抱怨,因为当我单击下一个网格项时,弹出式菜
<GridView
ItemsSource="{x:Bind ViewModel.SourceForOfferorsList}"
IsItemClickEnabled="True"
IsTapEnabled="True"
IsSwipeEnabled="False"
CanDragItems="False"
SelectionMode="Single"
>
<GridView.ItemTemplate>
<DataTemplate x:DataType="models:SetupCompany" >
<Grid x:Name="MyGrid">
<FlyoutBase.AttachedFlyout>
<Flyout helpers:BindableFlyout.ItemsSource="{Binding ElementName=RankPage,Path=DataContext.SourceForSubfactorsFlyoutList,Mode=TwoWay}">
<helpers:BindableFlyout.ItemTemplate>
<DataTemplate>
<MenuFlyoutItem Text="{Binding Text}" />
</DataTemplate>
</helpers:BindableFlyout.ItemTemplate>
</Flyout>
</FlyoutBase.AttachedFlyout>
<i:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="Tapped">
<helpers:OpenFlyoutAction/>
</core:EventTriggerBehavior>
</i:Interaction.Behaviors>
<TextBlock Text="Hello"></TextBlock>
</Grid>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>
可绑定弹出型按钮类:
public class BindableFlyout : DependencyObject
{
#region ItemsSource
public static IEnumerable GetItemsSource(DependencyObject obj)
{
return obj.GetValue(ItemsSourceProperty) as IEnumerable;
}
public static void SetItemsSource(DependencyObject obj, IEnumerable value)
{
obj.SetValue(ItemsSourceProperty, value);
}
public static readonly DependencyProperty ItemsSourceProperty =
DependencyProperty.RegisterAttached("ItemsSource", typeof(IEnumerable),
typeof(BindableFlyout), new PropertyMetadata(null, ItemsSourceChanged));
private static void ItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{ Setup(d as Windows.UI.Xaml.Controls.Flyout); }
#endregion
#region ItemTemplate
public static DataTemplate GetItemTemplate(DependencyObject obj)
{
return (DataTemplate)obj.GetValue(ItemTemplateProperty);
}
public static void SetItemTemplate(DependencyObject obj, DataTemplate value)
{
obj.SetValue(ItemTemplateProperty, value);
}
public static readonly DependencyProperty ItemTemplateProperty =
DependencyProperty.RegisterAttached("ItemTemplate", typeof(DataTemplate),
typeof(BindableFlyout), new PropertyMetadata(null, ItemsTemplateChanged));
private static void ItemsTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{ Setup(d as Windows.UI.Xaml.Controls.Flyout); }
#endregion
private static async void Setup(Windows.UI.Xaml.Controls.Flyout m)
{
if (Windows.ApplicationModel.DesignMode.DesignModeEnabled)
return;
var s = GetItemsSource(m);
if (s == null)
return;
var t = GetItemTemplate(m);
if (t == null)
return;
var c = new Windows.UI.Xaml.Controls.ItemsControl
{
ItemsSource = s,
ItemTemplate = t,
};
var n = Windows.UI.Core.CoreDispatcherPriority.Normal;
Windows.UI.Core.DispatchedHandler h = () => m.Content = c;
await m.Dispatcher.RunAsync(n, h);
}
}
我更改了代码中的一些位置,并制作了一个简单的代码示例供您参考:
<GridView x:Name="gridview"
IsItemClickEnabled="True"
IsTapEnabled="True"
IsSwipeEnabled="False"
CanDragItems="False"
SelectionMode="Single">
<GridView.ItemTemplate>
<DataTemplate >
<Grid x:Name="MyGrid">
<FlyoutBase.AttachedFlyout>
<Flyout local:BindableFlyout.ItemsSource="{Binding menuItems}">
<local:BindableFlyout.ItemTemplate>
<DataTemplate>
<MenuFlyoutItem Text="{Binding Text}" />
</DataTemplate>
</local:BindableFlyout.ItemTemplate>
</Flyout>
</FlyoutBase.AttachedFlyout>
<TextBlock Text="{Binding item}"></TextBlock>
<i:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="RightTapped">
<core:InvokeCommandAction Command="{Binding relayCommand}" CommandParameter="{Binding ElementName=MyGrid}"/>
</core:EventTriggerBehavior>
</i:Interaction.Behaviors>
</Grid>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>
公共密封部分类主页面:第页
{
公共主页()
{
this.InitializeComponent();
列表ls=新列表();
List myMenuItems=新列表();
添加(新的MyMenuItem(){Text=“menu1”});
添加(新的MyMenuItem(){Text=“menu2”});
添加(newtest(){item=“item1”,menuItems=myMenuItems});
添加(newtest(){item=“item2”,menuItems=myMenuItems});
gridview.ItemsSource=ls;
}
}
公共类测试:ViewModelBase
{
公共字符串项{get;set;}
公共列表菜单项{get;set;}
公共RelayCommand RelayCommand{get;set;}
公开考试()
{
relayCommand=新的relayCommand(显示弹出按钮);
}
专用空心显示弹出按钮(对象obj)
{
FrameworkElement senderElement=obj作为FrameworkElement;
FlyoutBase FlyoutBase=FlyoutBase.GetAttachedFlyout(senderElement);
飞出基地。ShowAt(senderElement);
}
}
公共类MyMenuItem
{
公共字符串文本{get;set;}
}
太棒了!!!成功了。我还尝试在ViewModel中实现这一点,以便更接近MVVM,但没有成功。但它在代码背后工作得很好。非常感谢!
<GridView x:Name="gridview"
IsItemClickEnabled="True"
IsTapEnabled="True"
IsSwipeEnabled="False"
CanDragItems="False"
SelectionMode="Single">
<GridView.ItemTemplate>
<DataTemplate >
<Grid x:Name="MyGrid">
<FlyoutBase.AttachedFlyout>
<Flyout local:BindableFlyout.ItemsSource="{Binding menuItems}">
<local:BindableFlyout.ItemTemplate>
<DataTemplate>
<MenuFlyoutItem Text="{Binding Text}" />
</DataTemplate>
</local:BindableFlyout.ItemTemplate>
</Flyout>
</FlyoutBase.AttachedFlyout>
<TextBlock Text="{Binding item}"></TextBlock>
<i:Interaction.Behaviors>
<core:EventTriggerBehavior EventName="RightTapped">
<core:InvokeCommandAction Command="{Binding relayCommand}" CommandParameter="{Binding ElementName=MyGrid}"/>
</core:EventTriggerBehavior>
</i:Interaction.Behaviors>
</Grid>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>