我有ListView
,内容为List<MyListItem>
,我需要使用ControlTemplate
才能在选择项目时更改效果。现在我遇到{Binding MyProperty}
在ControlTemplate
内部无效的问题。如何在模板中访问MyListItem
的属性?
我的XAML看起来像这样(简化):
<ListView
Name="ListView"
Grid.Column="1"
IsSwipeEnabled="False">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
</VisualStateGroup>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected">
<Storyboard>
<ColorAnimation Duration="0" Storyboard.TargetName="myColoredText" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" To="Orange"/>
</Storyboard>
</VisualState>
<VisualState x:Name="SelectedUnfocused">
<Storyboard>
<ColorAnimation Duration="0" Storyboard.TargetName="myColoredText" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" To="Red"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<!-- Here I have my custom layout, removed for readability -->
<TextBlock
Name="myColoredText"
Foreground="Green"
Text="{Binding MyProperty}"/><!-- This does not work -->
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
</ListView>
以下是此XAML背后的课程:
public sealed partial class MyPage : Page
{
public MyPage()
{
InitializeComponent();
ListView.ItemsSource = new List<MyListItem>()
{
new MyListItem("Title1", "SubTitle1"),
new MyListItem("Title2", "SubTitle2")
}
}
}
和MyListItem类:
class MyListItem
{
public string MyProperty { get; set; }
public string MyOtherProperty { get; set; }
public MyListItem(string myProperty, string myOtherProperty)
{
MyProperty = myProperty;
MyOtherProperty = myOtherProperty;
}
}
问题最小的项目:
答案 0 :(得分:9)
在TextBox
中,使用:
Text="{Binding Content.MyProperty,
RelativeSource={RelativeSource TemplatedParent}}"
答案 1 :(得分:1)
Wpf仅支持绑定属性,而不支持绑定到字段。所以,MyItemClass应该是:
public class MyListItem {
public string MyProperty { get; set; }
public string MyOtherProperty { get; set; }
public MyListItem(string myProperty, string myOtherProperty) {
MyProperty = myProperty;
MyOtherProperty = myOtherProperty;
}
}
希望,这有帮助
答案 2 :(得分:0)
在处理自定义{TemplateBinding}
时,您需要使用ControlTemplate
表达式。这会将属性值绑定到与控件实例关联的任何相应属性。
<TextBlock Name="myColoredText"
Foreground="Green"
Text="{TemplateBinding MyProperty}" />
这将直接绑定到控件中的指定实例属性。由于WPF / WinRT控件为DependencyObjects
,因此常用DependencyProperties
:
public static readonly DependencyProperty MyPropertyProperty =
DependencyProperty.Register(
"MyProperty",
typeof(Boolean),
typeof(ListViewItem),
null
);
public bool MyProperty
{
get { return (bool)GetValue(MyPropertyProperty); }
set { SetValue(MyPropertyProperty, value); }
}
然后在声明一个新实例时,会在XAML中标准填充此属性:
<someNamespace:ListViewItem MyProperty={Binding ViewModelProperty} />
您可以在MSDN上阅读有关TemplateBinding标记表达式的更多信息。
答案 3 :(得分:0)
ControlTemplate
通常用于定义控件的外观。因此,将XAML放入DataTemplate
并将其分配给ListView.ItemTemplate
属性要容易得多。您可以从DataTemplate
:
<ListView.ItemTemplate>
<DataTemplate>
<TextBlock Name="myColoredText" Foreground="Green"
Text="{Binding MyProperty}" /><!-- This will now work -->
</DataTemplate>
</ListView.ItemTemplate>
更新&gt;&gt;&gt;
您还可以使用DataTemplate
属性中的ItemContainerStyle
,如下所示:
<Style x:Key="SomeStyle" TargetType="{x:Type ListBoxItem}">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate DataType="{x:Type Your:DataType}">
<TextBlock Name="myColoredText" Foreground="Green"
Text="{Binding MyProperty}" /><!-- This will now work -->
</DataTemplate>
</Setter.Value>
</Setter>
</Style>