Question

我有一个ContentControl，其内容由DataTemplateSelector基于属性Workspace确定。但是当数据模板被更改时，我必须根据ContentControl的初始大小和整个Window进行一些计算，所以我想知道它何时被加载。

<ContentControl Content="{Binding Path=Workspace}" ContentTemplateSelector="{StaticResource workspaceTemplateSelector}" />

的ResourceDictionary：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
                    xmlns:vw="clr-namespace:Capgemini.Sag.KeyEm.View">

    <DataTemplate x:Key="keyboardTemplate"  >
        <vw:Keyboard/>
    </DataTemplate>

    <DataTemplate x:Key="welcomeTemplate">
        <vw:Welcome/>
    </DataTemplate>

    <vw:WorkspaceTemplateSelector            
        KeyboardTemplate="{StaticResource keyboardTemplate}"             
        WelcomeTemplate="{StaticResource welcomeTemplate}"        
        x:Key="workspaceTemplateSelector"/>
</ResourceDictionary>

DataTemplateSelector：

using Capgemini.Sag.KeyEm.ViewModel.Interfaces;

namespace Capgemini.Sag.KeyEm.View
{
    using System.Windows;
    using System.Windows.Controls;

    class WorkspaceTemplateSelector : DataTemplateSelector
    {
        public DataTemplate WelcomeTemplate { get; set; }
        public DataTemplate KeyboardTemplate { get; set; }

        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            if (item is IWelcomeViewModel)
                return WelcomeTemplate;
            if (item is IKeyboardViewModel)
                return KeyboardTemplate;
            return null;
        }
    }
}

Answer 1

您可以做的一件事是将datatemplate内容包装在容器中并侦听加载的事件

<DataTemplate x:Key="keyboardTemplate">
        <Grid Loaded="Grid_Loaded">
            <vw:Welcome/>
        </Grid>
    </DataTemplate>

切换模板时会引发加载的事件。希望这会有所帮助。

我如何知道更改时何时加载ContentControl的内容

1 个答案: