ContentControl 内的 Xaml 并绑定到 DependencyProperty

问题描述：

我有两个关于在 Windows Phone 上开发的问题:

I have two questions about developing at Windows Phone:

我想创建自定义控件并能够在其中提供一些额外的 XAML.所以我在 ControlTemplate 中使用 ContentControl 和 ContentPresenter.

I want to create custom control and be able to provide some extra XAML inside it. So I use ContentControl with ContentPresenter inside ControlTemplate.

<ContentControl>
    <ControlTemplate>
        <TextBlock Name="TextBlockControl" Text="Existing controls"/>
        <ContentPresenter/>
    </ControlTemplate>
</ContentControl>

它有效，但我无法从代码隐藏访问 ControlTemplate 内的 TextBlockControl.FindName 总是返回 null.

It worked, but I can't access TextBlockControl inside ControlTemplate from code-behind. FindName always returns null.

其次，我想为 Control 提供属性，所以我像这样创建 DependencyProperty:

Secondly, I want to provide attributes for Control, so I create DependencyProperty like this:

public string CustomText
{
    get { return (string)GetValue(CustomTextProperty); }
    set
    {
        SetValue(CustomTextProperty, value);
        TextBlockControl.Text = value;
    }
}

public static readonly DependencyProperty CustomTextProperty =
    DependencyProperty.Register("CustomText", typeof(string), typeof(MyControl), null);

如您所见，我编写了 TextBlockControl.Text = value; 来为控件内的 TextBlock 设置文本.当我设置静态字符串时 - 它有效

As you can see, I write TextBlockControl.Text = value; to set text for TextBlock inside of my Control. When I set static string - it works

<MyControl CustomText="Static Text"/>

但是当我想使用 Binding(例如对于 LocalizedStrings 资源)时 - 它不起作用.我是否缺少 PropertyMeta 回调或某些 IPropertyChanged 继承?我已经阅读了大量关于相同问题的 * 问题，但没有人回答我的问题.

But when I want to use Binding (e.g. for LocalizedStrings resource) - it doesn't work. Am i missing PropertyMeta Callback, or some IPropertyChanged inheritance? I have read tons of * questions with the same issue, but nothing answered my questions.

答

第一个问题的答案:

如果您创建自定义控件并分配模板，则可以使用以下方法访问该模板中的元素:

If you créate your custom-control, and you assign a template, you can Access to the elements in that template using :

[TemplatePart(Name = "TextBlockControl", Type = typeof(FrameworkElement))]

你必须把这个属性放在像blend这样的工具中，知道这个自定义控件的模板必须有一个名为TextBlockControl的文本块.然后从控件的OnApplyTemplate你应该得到一个对它的引用:

You have to put this attribute in order to tools like blend, know that the template for this custom-control has to have a textblock called TextBlockControl.Then from the control's OnApplyTemplate you should get a reference to it whit :

 protected override void OnApplyTemplate()
    {
        _part1 = this.GetTemplateChild("TextBlockControl") as FrameworkElement;
        base.OnApplyTemplate();
    }

ContentControl 内的 Xaml 并绑定到 DependencyProperty

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