TemplateBinding不适用于文本框文本 [英] TemplateBinding not working for textbox text

问题描述

我有一个名为 EnhancedTextBox 的自定义控件，它是一个具有 TextBox 和按钮。对于消费者来说，我希望它看起来像一个文本框，所以我做了以下操作：

I have a custom control called EnhancedTextBox which is a UserControl that has a TextBox and a Button. To the consumer I want it to mostly look like a TextBox, so I did the following:

<UserControl.Template>
    <ControlTemplate TargetType="textBoxes:EnhancedTextBox">
    ...
    <TextBox Text="{TemplateBinding Text}"...

并且在EnhancedTextBox中，我有

And in EnhancedTextBox I have

public static readonly DependencyProperty TextProperty =
  DependencyProperty.Register("Text", typeof (String), typeof (EnhancedTextBox));

public String Text
{
  get { return (String) GetValue(TextProperty); }
  set { SetValue(TextProperty, value); }
}

但是，当我按以下方式使用它时：

Yet, when I use it as the following:

<EnhancedTextBox Text="{Binding MyText, Mode=TwoWay, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}}" />

然后， MyText 从未更新，因为以及检查 EnhancedTextBox.Text 时，它为null。我想念什么？我一直盯着这个看了一眼，不知道出什么问题了。我什至认为这可能是我使用相同名称的事实，因此创建一个名为 Text1 的属性，该属性不起作用....

Then, MyText is never updated, as well as I inspect EnhancedTextBox.Text and it is null. What am I missing? I have been staring at this for a bit and can't figure out what is wrong. I even thought it might be the fact that I was using the same name, so create a property called Text1 which did not work....

还要注意，如果我使用常规的 TextBox ，那么这一切都可行。因此，我相当确定问题出在 EnhancedTextBox 本身

Also of note, if I use a regular TextBox, then this all works. So, I am fairly certain the problem is with the EnhancedTextBox itself

推荐答案

在阅读有关模板绑定的MSDN 后，我就知道了。具体来说，

I figured it out after reading this MSDN about TemplateBinding. Specifically,

TemplateBinding是针对模板方案的Binding的优化形式，类似于使用 {Binding RelativeSource = {RelativeSource TemplatedParent}} 。

因此，我决定明确地执行此操作...这将允许我进行设置 UpdateSourceTrigger （仍然不确定为什么它不默认为 PropertyChanged ）

So, I decided to do this explicitly...which would allow me to set the UpdateSourceTrigger (still not sure why it doesn't default to PropertyChanged)

<TextBox Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Text, UpdateSourceTrigger=PropertyChanged}"....

现在，它正在工作。 TemplateBinding 甚至都没有公开这些属性....再次不确定为什么

And, now it is working. TemplateBinding does not even expose these properties....again, not sure why

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