StyleSelector 类

定义

public ref class StyleSelector

public class StyleSelector

type StyleSelector = class

Public Class StyleSelector

继承

Object

StyleSelector

示例

以下示例演示如何定义 StyleSelector 为行定义 的 Style 。 此示例根据行索引定义 Background 颜色。

public class ListViewItemStyleSelector : StyleSelector
{
    public override Style SelectStyle(object item, 
        DependencyObject container)
    {
        Style st = new Style();
        st.TargetType = typeof(ListViewItem);
        Setter backGroundSetter = new Setter();
        backGroundSetter.Property = ListViewItem.BackgroundProperty;
        ListView listView = 
            ItemsControl.ItemsControlFromItemContainer(container) 
              as ListView;
        int index = 
            listView.ItemContainerGenerator.IndexFromContainer(container);
        if (index % 2 == 0)
        {
            backGroundSetter.Value = Brushes.LightBlue;
        }
        else
        {
            backGroundSetter.Value = Brushes.Beige;
        }
        st.Setters.Add(backGroundSetter);
        return st;
    }
}

Public Class ListViewItemStyleSelector
    Inherits StyleSelector
    Public Overrides Function SelectStyle(ByVal item As Object, ByVal container As DependencyObject) As Style
        Dim st As New Style()
        st.TargetType = GetType(ListViewItem)
        Dim backGroundSetter As New Setter()
        backGroundSetter.Property = ListViewItem.BackgroundProperty
        Dim listView As ListView = TryCast(ItemsControl.ItemsControlFromItemContainer(container), ListView)
        Dim index As Integer = listView.ItemContainerGenerator.IndexFromContainer(container)
        If index Mod 2 = 0 Then
            backGroundSetter.Value = Brushes.LightBlue
        Else
            backGroundSetter.Value = Brushes.Beige
        End If
        st.Setters.Add(backGroundSetter)
        Return st
    End Function
End Class

以下示例演示如何为 StyleSelector定义 ResourceKey 。 前缀 namespc 映射到 CLR 命名空间和定义 的 StyleSelector 相应程序集。 有关详细信息，请参阅 XAML 命名空间和 WPF XAML 的命名空间映射。

<namespc:ListViewItemStyleSelector x:Key="myStyleSelector"/>

以下示例演示如何将 的 ListView 属性设置为ItemContainerStyleSelector此StyleSelector资源。

<ListView 
      ItemsSource="{Binding Source={StaticResource EmployeeData}, 
                                        XPath=Employee}"
      ItemContainerStyleSelector="{DynamicResource myStyleSelector}" >      
  <ListView.View>
    <GridView>
      <GridViewColumn DisplayMemberBinding="{Binding XPath=FirstName}" 
                      Header="First Name" Width="120"/>
      <GridViewColumn DisplayMemberBinding="{Binding XPath=LastName}" 
                      Header="Last Name" Width="120"/>
      <GridViewColumn DisplayMemberBinding="{Binding XPath=FavoriteCity}" 
                      Header="Favorite City" Width="120"/>
    </GridView>
  </ListView.View>
</ListView>

有关如何创建选择器以选择定义的样式资源的示例，请参阅 的 DataTemplateSelector.SelectTemplate实现，它允许你根据类似的概念使用自定义逻辑来选择 DataTemplate。

注解

若要创建 StyleSelector 基于自定义逻辑应用样式的 ，请创建 类的 StyleSelector 子类并实现 SelectStyle 方法。

构造函数

方法

适用于

另请参阅

• ItemContainerStyleSelector
• ContainerStyleSelector
• DataTemplateSelector