是否可以使用 XAML 文件中的 XamlReader 加载 XAML 文本块？

Question

我在许多控件中使用以下 DataTemplate：

<pages:BasePageManageItems x:Class="TestApp.Pages.PageManageAddresses"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:pages="clr-namespace:TestHistorierung.Pages"
    xmlns:tk="http://schemas.microsoft.com/wpf/2008/toolkit"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Background="#eee"
             VerticalAlignment="Stretch">
    <pages:BasePageManageItems.Resources>
        <DataTemplate x:Key="manageAreaCellTemplate">
            <Border Padding="2">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                    Tag="{Binding Id}" Text="Delete" MouseDown="System_Delete_Click"
                    Margin="0 0 5 0"/>
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                   Tag="{Binding Id}" Text="Edit" MouseDown="System_Edit_Click"
                    Margin="0 0 5 0"/>
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                   Tag="{Binding Id}" Text="Add" MouseDown="System_Add_Click"
                    Margin="0 0 5 0"/>
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                   Tag="{Binding Id}" Text="Copy" MouseDown="System_Copy_Click"
                    Margin="0 0 5 0"/>
                </StackPanel>
            </Border>
        </DataTemplate>
    </pages:BasePageManageItems.Resources>

有没有办法从 XAML 使用 XamlReader，以便我可以简单地将 DataTemplate 的文本加载到 XAML 文件中动态？我正在想象这样的事情（伪代码）：

<pages:BasePageManageItems x:Class="TestApp.Pages.PageManageAddresses"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:pages="clr-namespace:TestHistorierung.Pages"
    xmlns:tk="http://schemas.microsoft.com/wpf/2008/toolkit"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Background="#eee"
             VerticalAlignment="Stretch">
    <pages:BasePageManageItems.Resources>
        <XamlReader Load="XamlBlocks/DateTemplateManageButtons.xaml"/>
    </pages:BasePageManageItems.Resources>

Answer 1

您不应该将 XamlReader 标记放置在 Xaml 中（我什至不知道是否可能）。相反，您可以使用 XamlReader 类在代码中创建编译的 Xaml，并将其附加到父元素：

 var element = XamlReader.Load(stringContainingXaml);
 this.somePanel.Children.Insert(0, element as FrameworkElement);

Answer 2

您可以将常见的 XAML 放入 ResourceDictionary 中：

XamlBlocks/DateTemplateManageButtons.xaml （添加到项目中，构建操作 = 页面）

<ResourceDictionary x:Class="myNmaespace.DateTemplateManageButtons"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <DataTemplate x:Key="manageAreaCellTemplate">
            <Border Padding="2">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                    Tag="{Binding Id}" Text="Delete" MouseDown="System_Delete_Click"
                    Margin="0 0 5 0"/>
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                   Tag="{Binding Id}" Text="Edit" MouseDown="System_Edit_Click"
                    Margin="0 0 5 0"/>
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                   Tag="{Binding Id}" Text="Add" MouseDown="System_Add_Click"
                    Margin="0 0 5 0"/>
                    <TextBlock Style="{DynamicResource ManageLinkStyle}"
                   Tag="{Binding Id}" Text="Copy" MouseDown="System_Copy_Click"
                    Margin="0 0 5 0"/>
                </StackPanel>
            </Border>
        </DataTemplate>
    </ResourceDictionary>

XamlBlocks/DateTemplateManageButtons.xaml.cs ：

namespace myNamespace
{
    public partial class DateTemplateManageButtons : ResourceDictionary
    {
        private void System_Delete_Click(object sender, RoutedEventArgs e)
        {
            // event handler code
        }
        // other event handlers
    }
}

在您的页面中：

<pages:BasePageManageItems x:Class="TestApp.Pages.PageManageAddresses"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:pages="clr-namespace:TestHistorierung.Pages"
    xmlns:tk="http://schemas.microsoft.com/wpf/2008/toolkit"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Background="#eee"
             VerticalAlignment="Stretch">
    <pages:BasePageManageItems.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="XamlBlocks/DateTemplateManageButtons.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </pages:BasePageManageItems.Resources>

如果您需要事件处理程序代码在页面而不是资源字典，您可以执行以下操作：

定义事件接口：

public interface IDateTemplateManageButtonsEvents 
{
    void System_Delete_Click(object sender, RoutedEventArgs e); 
}

在使用数据模板的所有页面中实现该接口

在资源字典 cs 文件中：

private IDateTemplateManageButtonsEvents FindPage(object sender)
{
    DependencyObject current = sender as DependencyObject;
    while(current != null && !(current is IDateTemplateManageButtonsEvents))
    {
        current = VisualTreeHelper.GetParent(current);
    }
    return (IDateTemplateManageButtonsEvents)current;
}
private void System_Delete_Click(object sender, RoutedEventArgs e)
{
    FindPage(sender).System_Delete_Click(sender, e);
}