C# 在Windows通用应用程序中标记文本框

我试图在windows通用应用程序中使用C#和XAML实现一个带标签的

TextBox

，但我没有得到

TextBox

的值作为回报，只有空字符串

我的generic.xaml的代码如下所示：

<Style TargetType="template:LabeledTextBox">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="template:LabeledTextBox">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*" />
                        <RowDefinition Height="*" />
                    </Grid.RowDefinitions>
                    <TextBlock Text="{TemplateBinding Label}" FontWeight="Bold" VerticalAlignment="Center" Margin="10,0" />
                    <TextBox Text="{TemplateBinding Value}" IsReadOnly="{TemplateBinding IsReadOnly}" VerticalAlignment="Center" Margin="20,0,10,0" Grid.Row="1" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

public sealed class LabeledTextBox : Control, IParameterReturnable
{
    public static readonly DependencyProperty LabelProperty = DependencyProperty.Register("Label", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Label
    {
        get { return this.GetValue(LabelProperty).ToString(); }
        set { this.SetValue(LabelProperty, value); }
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Value
    {
        get { return this.GetValue(ValueProperty).ToString(); }
        set { this.SetValue(ValueProperty, value); }
    }

    public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(LabeledTextBox), new PropertyMetadata(false));
    public string IsReadOnly
    {
        get { return this.GetValue(IsReadOnlyProperty).ToString(); }
        set { this.SetValue(IsReadOnlyProperty, value); }
    }

    public LabeledTextBox()
    {
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public LabeledTextBox(Parameter parameter)
    {
        this.Label = parameter.DisplayName;
        this.Value = parameter.DefaultValue ?? "";
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public string GetKey()
    {
        return this.Label;
    }

    public string GetValue()
    {
        return this.Value;
    }
}

foreach (Parameter parameter in parameters)
{
    stackPanel.Children.Add(new LabeledTextBox(parameter));
}

foreach(IParameterReturnable parameter in stackPanel.Children)
{
    string val = parameter.GetValue() // <= this will always return the default value
}

[TemplatePart(Name = "PART_TextBox", Type = typeof(TextBox))]
public sealed class LabeledTextBox : Control, IParameterReturnable
{
    public static readonly DependencyProperty LabelProperty = DependencyProperty.Register("Label", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Label
    {
        get { return this.GetValue(LabelProperty).ToString(); }
        set { this.SetValue(LabelProperty, value); }
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Value
    {
        get { return this.GetValue(ValueProperty).ToString(); }
        set { this.SetValue(ValueProperty, value); }
    }

    public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(LabeledTextBox), new PropertyMetadata(false));
    public string IsReadOnly
    {
        get { return this.GetValue(IsReadOnlyProperty).ToString(); }
        set { this.SetValue(IsReadOnlyProperty, value); }
    }

    public LabeledTextBox()
    {
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    private TextBox _textBox;

    protected override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        _textBox = GetTemplateChild("PART_TextBox") as TextBox;

        if (_textBox != null)
        {
            _textBox.TextChanged += TextBoxOnTextChanged;
        }
    }

    private void TextBoxOnTextChanged(object sender, TextChangedEventArgs textChangedEventArgs)
    {
        this.Value = _textBox.Text;
    }

    public LabeledTextBox(Parameter parameter)
    {
        this.Label = parameter.DisplayName;
        this.Value = parameter.DefaultValue ?? "";
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public string GetKey()
    {
        return this.Label;
    }

    public string GetValue()
    {
        return this.Value;
    }
}

您可以随意忽略我的iPareMeterReturnable，我正在使用它访问

GetKey（）

和

GetValue（）

，同时循环使用这些带标签的控件的不同类型

那么我错过了什么，我做错了什么

非常感谢您提供的所有有用且善意的答案

编辑：用于添加控件的代码

控件是用C#动态添加的，如下所示：

<Style TargetType="template:LabeledTextBox">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="template:LabeledTextBox">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*" />
                        <RowDefinition Height="*" />
                    </Grid.RowDefinitions>
                    <TextBlock Text="{TemplateBinding Label}" FontWeight="Bold" VerticalAlignment="Center" Margin="10,0" />
                    <TextBox Text="{TemplateBinding Value}" IsReadOnly="{TemplateBinding IsReadOnly}" VerticalAlignment="Center" Margin="20,0,10,0" Grid.Row="1" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

public sealed class LabeledTextBox : Control, IParameterReturnable
{
    public static readonly DependencyProperty LabelProperty = DependencyProperty.Register("Label", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Label
    {
        get { return this.GetValue(LabelProperty).ToString(); }
        set { this.SetValue(LabelProperty, value); }
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Value
    {
        get { return this.GetValue(ValueProperty).ToString(); }
        set { this.SetValue(ValueProperty, value); }
    }

    public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(LabeledTextBox), new PropertyMetadata(false));
    public string IsReadOnly
    {
        get { return this.GetValue(IsReadOnlyProperty).ToString(); }
        set { this.SetValue(IsReadOnlyProperty, value); }
    }

    public LabeledTextBox()
    {
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public LabeledTextBox(Parameter parameter)
    {
        this.Label = parameter.DisplayName;
        this.Value = parameter.DefaultValue ?? "";
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public string GetKey()
    {
        return this.Label;
    }

    public string GetValue()
    {
        return this.Value;
    }
}

foreach (Parameter parameter in parameters)
{
    stackPanel.Children.Add(new LabeledTextBox(parameter));
}

foreach(IParameterReturnable parameter in stackPanel.Children)
{
    string val = parameter.GetValue() // <= this will always return the default value
}

[TemplatePart(Name = "PART_TextBox", Type = typeof(TextBox))]
public sealed class LabeledTextBox : Control, IParameterReturnable
{
    public static readonly DependencyProperty LabelProperty = DependencyProperty.Register("Label", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Label
    {
        get { return this.GetValue(LabelProperty).ToString(); }
        set { this.SetValue(LabelProperty, value); }
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Value
    {
        get { return this.GetValue(ValueProperty).ToString(); }
        set { this.SetValue(ValueProperty, value); }
    }

    public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(LabeledTextBox), new PropertyMetadata(false));
    public string IsReadOnly
    {
        get { return this.GetValue(IsReadOnlyProperty).ToString(); }
        set { this.SetValue(IsReadOnlyProperty, value); }
    }

    public LabeledTextBox()
    {
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    private TextBox _textBox;

    protected override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        _textBox = GetTemplateChild("PART_TextBox") as TextBox;

        if (_textBox != null)
        {
            _textBox.TextChanged += TextBoxOnTextChanged;
        }
    }

    private void TextBoxOnTextChanged(object sender, TextChangedEventArgs textChangedEventArgs)
    {
        this.Value = _textBox.Text;
    }

    public LabeledTextBox(Parameter parameter)
    {
        this.Label = parameter.DisplayName;
        this.Value = parameter.DefaultValue ?? "";
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public string GetKey()
    {
        return this.Label;
    }

    public string GetValue()
    {
        return this.Value;
    }
}

但在Xaml中看起来是这样的：

<templates:LabeledTextBox Label="[Label]" Value="[Value]" IsReadOnly="False" />

它将这样读出来：

<Style TargetType="template:LabeledTextBox">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="template:LabeledTextBox">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*" />
                        <RowDefinition Height="*" />
                    </Grid.RowDefinitions>
                    <TextBlock Text="{TemplateBinding Label}" FontWeight="Bold" VerticalAlignment="Center" Margin="10,0" />
                    <TextBox Text="{TemplateBinding Value}" IsReadOnly="{TemplateBinding IsReadOnly}" VerticalAlignment="Center" Margin="20,0,10,0" Grid.Row="1" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

public sealed class LabeledTextBox : Control, IParameterReturnable
{
    public static readonly DependencyProperty LabelProperty = DependencyProperty.Register("Label", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Label
    {
        get { return this.GetValue(LabelProperty).ToString(); }
        set { this.SetValue(LabelProperty, value); }
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Value
    {
        get { return this.GetValue(ValueProperty).ToString(); }
        set { this.SetValue(ValueProperty, value); }
    }

    public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(LabeledTextBox), new PropertyMetadata(false));
    public string IsReadOnly
    {
        get { return this.GetValue(IsReadOnlyProperty).ToString(); }
        set { this.SetValue(IsReadOnlyProperty, value); }
    }

    public LabeledTextBox()
    {
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public LabeledTextBox(Parameter parameter)
    {
        this.Label = parameter.DisplayName;
        this.Value = parameter.DefaultValue ?? "";
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public string GetKey()
    {
        return this.Label;
    }

    public string GetValue()
    {
        return this.Value;
    }
}

foreach (Parameter parameter in parameters)
{
    stackPanel.Children.Add(new LabeledTextBox(parameter));
}

foreach(IParameterReturnable parameter in stackPanel.Children)
{
    string val = parameter.GetValue() // <= this will always return the default value
}

[TemplatePart(Name = "PART_TextBox", Type = typeof(TextBox))]
public sealed class LabeledTextBox : Control, IParameterReturnable
{
    public static readonly DependencyProperty LabelProperty = DependencyProperty.Register("Label", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Label
    {
        get { return this.GetValue(LabelProperty).ToString(); }
        set { this.SetValue(LabelProperty, value); }
    }

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LabeledTextBox), new PropertyMetadata(default(string)));
    public string Value
    {
        get { return this.GetValue(ValueProperty).ToString(); }
        set { this.SetValue(ValueProperty, value); }
    }

    public static readonly DependencyProperty IsReadOnlyProperty = DependencyProperty.Register("IsReadOnly", typeof(bool), typeof(LabeledTextBox), new PropertyMetadata(false));
    public string IsReadOnly
    {
        get { return this.GetValue(IsReadOnlyProperty).ToString(); }
        set { this.SetValue(IsReadOnlyProperty, value); }
    }

    public LabeledTextBox()
    {
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    private TextBox _textBox;

    protected override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        _textBox = GetTemplateChild("PART_TextBox") as TextBox;

        if (_textBox != null)
        {
            _textBox.TextChanged += TextBoxOnTextChanged;
        }
    }

    private void TextBoxOnTextChanged(object sender, TextChangedEventArgs textChangedEventArgs)
    {
        this.Value = _textBox.Text;
    }

    public LabeledTextBox(Parameter parameter)
    {
        this.Label = parameter.DisplayName;
        this.Value = parameter.DefaultValue ?? "";
        this.DefaultStyleKey = typeof(LabeledTextBox);
    }

    public string GetKey()
    {
        return this.Label;
    }

    public string GetValue()
    {
        return this.Value;
    }
}

foreach（stackPanel.Children中的iParmeTerreTurnable参数）
{
string val=parameter.GetValue（）/您没有使用模板化的
文本框中的新值更新
值
属性

在您的
generic.xaml
文本框中添加一个名称
：
您可以在放置LabeledTextBox的位置共享xaml吗？对于我循环浏览这些控件的特殊情况，控件是通过c#而不是通过xaml动态添加到stackpanel的。那么如何设置标签和文本属性？您可以将代码添加到列表中吗然后，输入用代码更新。如果您不使用
标记
属性，您可以使用它来显示标签，而无需扩展
文本框
控件。也许我可以在这里自由地问您：当我得到一个LabeledBoxBox并想要绑定SelectionChanged事件时，静态依赖项应该是什么样子？我添加了我的问题是一个新的话题：