制作OneWayToSource /双向自定义控制绑定 [英] Making a OneWayToSource/TwoWay binding on custom control

问题描述

我有一个依赖属性的自定义控制，定义如下：

I have a custom control with a dependency property, defines as follows:

public class TemplatedTextBox : TextBox
{
    public static readonly DependencyProperty SearchStringProperty =
        DependencyProperty.Register("SearchString", typeof(string), typeof(TemplatedTextBox), new UIPropertyMetadata(string.Empty));

    public string SearchString
    {
        get { return (string)GetValue(SearchStringProperty); }
        set { SetValue(SearchStringProperty, value); }
    }
}

我用下面的控件模板：

I use the following control template:

    <WpfApp:TemplatedTextBox>
        <WpfApp:TemplatedTextBox.Template>
            <ControlTemplate TargetType="{x:Type WpfApp:TemplatedTextBox}">
                <StackPanel Height="20" Orientation="Horizontal">
                    <TextBlock Text="Search String :"/>
                    <TextBox x:Name="SearchTextBox"  Width="200" Text="NEED TO BE BINDED TO SearchString!"/>
                </StackPanel>
            </ControlTemplate>
        </WpfApp:TemplatedTextBox.Template>
    </WpfApp:TemplatedTextBox>

我要绑定 SearchTextBox 的文本属性，以我的 SearchString在属性在 OneWayToSource 或双向结合模式。

I want to bind SearchTextBox's Text property to my SearchString property in a OneWayToSource or TwoWay binding mode.

我试过：

Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=SearchString, Mode=OneWayToSource}"

这并不什么都不做

Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=SearchString, Mode=TwoWay}"

和

Text="{TemplateBinding SearchString}"

这在一个方向上工作得很好，当我编程的方法修改 SearchString在的文本在文本框的变化，而不是其他方式

Which works fine in one direction when I programatically change SearchString the Text on TextBox changes, but not the other way

我也试图使 SearchString在常规属性，并使用绑定的RelativeSource 在各种模式取值，但没有奏效。

I've also tried making SearchString a regular property and bind it using RelativeSource in all sorts of Modes but it didn't work.

这是定期查看到视图模型做绑定，所以我是什么在这里失踪？

This is a pretty straight forward thing to do in regular View-to-ViewModel binding, so what am I missing here?

推荐答案

我只是尝试它和它按预期工作。
难道是简单的东西，例如，你不会离开文本框输入字符，以便绑定不触发后？

I just tried it and it works as expected. Could it be something simply, e.g. you are not leaving the textbox after entering the characters so the binding does not trigger ?

尝试添加 UpdateSourceTrigger = PropertyChanged的，触发每个字符的结合输入。

Try to add UpdateSourceTrigger=PropertyChanged, to trigger the binding on each character entered.

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