ControlTemplate中的UWP TemplateBinding为固定值-Java 学习之路

我想将我的Controltemplate中的属性（myHeight）绑定到父级 . 以下是我目前的代码 .

Resource dict

<Style TargetType="local2:TestingControl" >
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local2:TestingControl">
                <Border
                    Height="{TemplateBinding myHeight}"
                    Background="Green"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}">
                    <StackPanel>                            
                        <ContentPresenter Content="{TemplateBinding Content}"/>
                    </StackPanel>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

TestingControl.cs

[ContentProperty(Name = "Content")]
public sealed class TestingControl : Control
{
    public TestingControl()
    {
        this.DefaultStyleKey = typeof(TestingControl);
    }

    public static readonly double myHeight = (double)100;

    public object Content
    {
        get { return (string)GetValue(ContentProperty); }
        set { SetValue(ContentProperty, value); }
    }

    public static readonly DependencyProperty ContentProperty =
        DependencyProperty.Register("Content", typeof(string), typeof(TestingControl), new PropertyMetadata(string.Empty));
}

我想要绑定的是myHeight . 我希望在.cs中有这个，因为我需要在它上面运行一些操作 . 这无法完全加载！

我也尝试了以下方法

Resource dict

<x:Double x:Key="myHeight">100</x:Double>
<Style TargetType="local2:TestingControl" >
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local2:TestingControl">
                <Border
                    Height="{ThemeResource myHeight}"
                    Background="Green"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}">

                    <ContentPresenter Content="{TemplateBinding Content}"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

TestingControl.cs

[ContentProperty(Name = "Content")]
public sealed class TestingControl : Control
{
    public TestingControl()
    {
        this.DefaultStyleKey = typeof(TestingControl);

        var x  = (double)Resources["myHeight"];
    }

    public object Content
    {
        get { return (string)GetValue(ContentProperty); }
        set { SetValue(ContentProperty, value); }
    }

    public static readonly DependencyProperty ContentProperty =
        DependencyProperty.Register("Content", typeof(string), typeof(TestingControl), new PropertyMetadata(string.Empty));
}

第二种方法的问题是，当在.cs代码中读取属性时， var x = (double)Resources["myHeight"]; 我得到一个异常 .

任何一个决议（最好是两个，因为我只是想学习UWP）将不胜感激 .

1 回答

第一件事是TemplateBinding应绑定依赖项属性，并编写无法绑定到Height的静态字段 .

第二件事是ThemeResource会找到主题，但你定义了一个静态源 .

<x:Double x:Key="myHeight">100</x:Double>
<Style TargetType="local2:TestingControl" >
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local2:TestingControl">
                <Border
                    Height="{StaticResource myHeight}"
                    Background="Green"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}">

                    <ContentPresenter Content="{TemplateBinding Content}"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

第三件事是你首先获得资源，但是在OnApplyTemplate之后获得资源 .

您应该将获取资源的代码移动到OnApplyTemplate .

protected override void OnApplyTemplate()
    {
        try
        {
            // find something in TestingControl.Resources
            var x = Resources["myHeight"];
        }
        catch (Exception e)
        {

        }

        try
        {
            // find something in App.Resources
            var x = App.Current.Resources["myHeight"];
        }
        catch (Exception e)
        {

        }

        base.OnApplyTemplate();
    }

如果您的资源是用App.xaml编写的，那么您应该使用App.Current.Resources来获取资源 .

如果您想在海关控制中获取资源，则应在控件中添加资源 .

<local:TestingControl>
        <local:TestingControl.Resources>
            <x:Double x:Key="myHeight">100</x:Double>
        </local:TestingControl.Resources>
    </local:TestingControl>

回复于 2024-05-08T03:56:17+08:00

ControlTemplate中的UWP TemplateBinding为固定值

1 回答

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