标签: listpicker

当组合框中有更多项目时,组合框将显示listpicker弹出窗口.如果我选择第一个并向下滚动,则多个项目将显示为已选中.但ComboBox的SelectedItem将是我选择的那个.我修改了ListPickerFlyout的样式并关闭了ListView的虚拟化.如果我这样做,ListView将不会保留SelectedItem.这是ComboBox的错误吗？有没有解决这个问题的方法

这是我修改过的风格

 <DataTemplate x:Key="ListPickerFlyoutPresenterContentTemplate" >
                <ListView VirtualizingStackPanel.VirtualizationMode="Recycling" SelectionMode="Single"   > 
                    <!--<ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <VirtualizingStackPanel/>
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>-->
                    <ListView.ItemContainerStyle>

                           <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="ListViewItem">
                                        <Border x:Name="OuterContainer" RenderTransformOrigin="0.5,0.5">
                                            <VisualStateManager.VisualStateGroups>
                                                <VisualStateGroup x:Name="CommonStates">
                                                    <VisualState x:Name="Normal" />
                                                    <VisualState x:Name="Pressed"/>

                                                    <VisualState x:Name="Disabled"/>
                                                                                                                                                        <VisualStateGroup.Transitions>
                                                        <VisualTransition From="Pressed" To="Normal" />


                                                    </VisualStateGroup.Transitions>
                                                </VisualStateGroup>
                                                <VisualStateGroup x:Name="SelectionStates">
                                                    <VisualState x:Name="Unselected" />
                                                    <VisualState x:Name="Selected">
                                                        <Storyboard>
                                                            <DoubleAnimation Storyboard.TargetName="CheckGlyph" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                                            <DoubleAnimation Storyboard.TargetName="SelectedCheckMark" Storyboard.TargetProperty="Opacity" Duration="0" To="1" />
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="contentPresenter" Storyboard.TargetProperty="Foreground" Duration="0">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Green" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentBorder" Storyboard.TargetProperty="Background">
                                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ListPickerFlyoutPresenterSelectedItemBackgroundThemeBrush}" />
                                                            </ObjectAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState> …

我正在使用ListPicker,但很难让设计工作.我已经包括了我做过的测试:

 <ControlTemplate x:Key="listpicker_style" TargetType="toolkit:ListPicker">
        <StackPanel>
            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="PickerStates">
                    <VisualState x:Name="Normal"/>
                    <VisualState x:Name="Highlighted">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames
                                Storyboard.TargetName="UserControl"
                                Storyboard.TargetProperty="Foreground"
                                Duration="0">
                                <DiscreteObjectKeyFrame
                                    Value="{StaticResource PhoneTextBoxForegroundBrush}"
                                    KeyTime="0"/>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames
                                Storyboard.TargetName="Border"
                                Storyboard.TargetProperty="Background"
                                Duration="0">
                                <DiscreteObjectKeyFrame
                                    Value="{StaticResource PhoneTextBoxEditBackgroundColor}"
                                    KeyTime="0"/>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames
                                Storyboard.TargetName="Border"
                                Storyboard.TargetProperty="BorderBrush"
                                Duration="0">
                                <DiscreteObjectKeyFrame
                                    Value="{StaticResource PhoneTextBoxEditBorderBrush}"
                                    KeyTime="0"/>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Disabled">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames
                                Storyboard.TargetName="Border"
                                Storyboard.TargetProperty="Background"
                                Duration="0">
                                <DiscreteObjectKeyFrame
                                    Value="{StaticResource TransparentBrush}"
                                    KeyTime="0"/>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames
                                Storyboard.TargetName="Border"
                                Storyboard.TargetProperty="BorderBrush"
                                Duration="0">
                                <DiscreteObjectKeyFrame
                                    Value="{StaticResource PhoneDisabledBrush}"
                                    KeyTime="0"/>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames
                                Storyboard.TargetName="UserControl"
                                Storyboard.TargetProperty="Foreground"
                                Duration="0">
                                <DiscreteObjectKeyFrame
                                    Value="{StaticResource PhoneDisabledBrush}"
                                    KeyTime="0"/>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <ContentControl
                Content="{TemplateBinding Header}"
                ContentTemplate="{TemplateBinding …

我正在尝试在Windows Phone 7 UserControl中对ListPicker的SelectedIndex属性进行双向绑定.

当我设置DataContext时,它引发以下异常: SelectedIndex must always be set to a valid value.

这是XAML代码

<Grid x:Name="LayoutRoot">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>

    <toolkit:ListPicker
        Grid.Row="0"
        x:Name="List1"
        SelectionChanged="Picker_SelectionChanged"
        SelectedIndex="{Binding PickerSelectedIndex, Mode=TwoWay}"
        ItemTemplate="{StaticResource PickerTemplate}"
        ItemsSource="{Binding MyList}"/>
</Grid>

和DataContext背后的代码

    private ObservableCollection<MyClass> myList = null;
    public ObservableCollection<MyClass> MyList
    {
        get { return this.myList; }
        set
        {
            if (value != this.myList)
            {
                this.myList= value;
                NotifyPropertyChanged("MyList");

                this.PickerSelectedIndex = 0;
            }
        }
    }

    private int pickerSelectedIndex = 0;
    public int PickerSelectedIndex
    {
        get
        {
            return this.pickerSelectedIndex;
        } …

我在WP7上有以下XAML代码:

<toolkit:ListPicker x:Name="ListPickerBwFactors" ItemsSource="{Binding BwFactors}" 
                            cal:Message.Attach="[Event SelectionChanged]=[Action ChangeBinarizeFactor(ListPickerBwFactors.ItemSelected)]">
</toolkit:ListPicker>

我收到错误:Target必须是FrameworkElement或CollectionViewSource

我想要做的就是从ListPicker传递给我的VM,SelectedItem.我究竟做错了什么 ？

我有一个具有以下结构的ListPicker:

toolkit:ListPicker x:Name="mListPicker" HorizontalAlignment="Right" Margin="0,75,43,0" Width="100" VerticalAlignment="Top">
< toolkit:ListPickerItem Content="5"/>
< toolkit:ListPickerItem Content="10"/>
< toolkit:ListPickerItem Content="15"/>
< toolkit:ListPickerItem Content="20"/>
< toolkit:ListPickerItem Content="25"/>
< toolkit:ListPickerItem Content="30"/>
< /toolkit:ListPicker>

每当我尝试运行此命令时,会出现以下消息:

System.Windows.Markup.XamlParseException occurred
  Message= [Line: 0 Position: 0]
   --- Inner Exception ---
The parameter is incorrect. 

  LineNumber=0
  LinePosition=0
  StackTrace:
       at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
       at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
       at MS.Internal.XcpImports.FrameworkElement_ApplyTemplate(FrameworkElement frameworkElement)
       at System.Windows.FrameworkElement.ApplyTemplateInternal()
       at System.Windows.Controls.ScrollContentPresenter.HookupScrollingComponents()
       at System.Windows.Controls.ScrollContentPresenter.OnApplyTemplate()
       at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)
       at MS.Internal.XcpImports.MeasureNative(IntPtr element, Single inWidth, Single inHeight)
       at MS.Internal.XcpImports.UIElement_Measure(UIElement element, …

我正在为一个新项目尝试使用caliburn.micro框架,但我坚持使用绑定ListPicker(工具包中的那个).当我将控件更改为简单的DropDown时,一切都按预期工作.我假设DropDown工作正常,因为这里实现了默认约定:

AddElementConvention<Selector>(Selector.ItemsSourceProperty, "SelectedItem", "SelectionChanged")
    .ApplyBinding = (viewModelType, path, property, element, convention) => {
        if (!SetBinding(viewModelType, path, property, element, convention))
            return false;

        ConfigureSelectedItem(element, Selector.SelectedItemProperty,viewModelType, path);
        ApplyItemTemplate((ItemsControl)element, property);

        return true;
    };

ListPicker没有实现Selector,所以我试图在我的引导程序中添加一个自定义约定:

static void AddCustomConventions() {
    AddElementConvention<ListPicker>(ListPicker.ItemsSourceProperty, "SelectedItem", "SelectionChanged")
        .ApplyBinding = (viewModelType, path, property, element, convention) => {
            ConventionManager.ConfigureSelectedItem(element, ListPicker.SelectedItemProperty,viewModelType, path);
            return true;
        };
}

不幸的是,这不起作用.你能帮我吗？

我试图在wp7中创建一个下拉列表,它将具有文本属性和值.

我将使用什么控件,是否有人有一个显示如何将其绑定到Odata的exmaple？

谢谢

我想确定当前在ListPicker中选择的项目的名称.我不确定在SelectionChanged事件中要做什么来获取项目的名称.

XAML

<Grid.Resources>
        <DataTemplate x:Name="PickerItemTemplate">
            <TextBlock Text="{Binding Name}"/>
        </DataTemplate>
    </Grid.Resources>

<toolkit:ListPicker x:Name="ThemeListPicker" Header="{Binding Path=LocalizedResources.SettingsPage_ThemeListPicker_Header, Source={StaticResource LocalizedStrings}}"
                                        ItemTemplate="{StaticResource PickerItemTemplate}"
                                        SelectionChanged="ThemeListPicker_SelectionChanged"/>

XAML.CS

protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);

        themeList = new List<Theme>();
        themeList.Add(new Theme() { Name = "light" });
        themeList.Add(new Theme() { Name = "dark" });
        ThemeListPicker.ItemsSource = themeList;
    }

private void ThemeListPicker_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        //get the name of the current item in the listpicker?
    }

这是空闲时的样子:

在这里,当我点击它时,应该弹出全屏选择模式(根据我读过的内容):

如您所见,它似乎没有打开全屏选择模式.

这是我的XAML:

<phone:PhoneApplicationPage 
    x:Class="GameLense.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <Grid>
        <Grid.Resources>
            <DataTemplate x:Name="PickerItemTemplate">
                <StackPanel Orientation="Horizontal">
                    <Border Background="Transparent" Width="34" Height="34">
                        <Image Source="{Binding ImagePath}" Margin="12 0 0 0" 
                               VerticalAlignment="Center" 
                               HorizontalAlignment="Center" 
                               Stretch="Fill"/>
                    </Border>
                    <TextBlock Text="{Binding Name}" Margin="12 0 0 0"/>
                </StackPanel>
            </DataTemplate>
            <DataTemplate x:Name="PickerFullModeItemTemplate">
                <StackPanel Orientation="Horizontal">
                    <Border Background="Gold" Width="34" Height="34">
                        <Image Source="{Binding ImagePath}" Margin="12 0 0 0" VerticalAlignment="Center" HorizontalAlignment="Center" />
                    </Border>
                    <TextBlock Text="{Binding Name}" Margin="12 0 0 …

我在WCF中有一个类:

[DataContract]
public class Usuario
{
    [DataMember]
    public int ID { get; set; }

    [DataMember]
    public string Nombre { get; set; }

    [DataMember]
    public string Contraseña { get; set; }
}

在WP7 Proyect中从WCF读取ObservableCollection并加载ListPicker:

lpUsuarios.ItemSource = listUsuarios;

这项工作还可以.

现在,在WP7中使用"Usuario _usuario = new Usuario()"作为局部变量.

问题是,如果我使用IsolatedStorage保存变量_usuario然后加载并应用:lpUsuarios.SelectedItem = _usuario,则会导致错误:SelectedItem必须始终设置为有效值.

例:

Usuarios _usuario = new Usuario();

private void ButtonSave_Click(object sender, RoutedEventArgs e)
{
     var settings = IsolatedStorageSettings.ApplicationSettings;
     _usuario = lpUsuarios.SelectedItem as Usuario;

     settings.Add("test", _usuario);
     settings.Save();
}

现在,关闭应用程序,然后打开:

private void ButtonLoad_Click(object sender, RoutedEventArgs e)
{
     settings.TryGetValue<Usuario>("test", …