如何基于条件在WPF应用中设置ContentControl内TextBox的可编辑性？

方案一：自定义ContentControl+依赖属性（推荐，扩展性强） #

通过给自定义ContentControl添加控制单个TextBox编辑状态的依赖属性，在模板中绑定这些属性来实现按需控制。

1. 定义自定义ContentControl

public class CustomTextBoxContainer : ContentControl
{
    // 控制第一个TextBox是否可编辑
    public static readonly DependencyProperty IsFirstTextBoxEditableProperty =
        DependencyProperty.Register("IsFirstTextBoxEditable", typeof(bool), typeof(CustomTextBoxContainer), new PropertyMetadata(false));
    
    public bool IsFirstTextBoxEditable
    {
        get => (bool)GetValue(IsFirstTextBoxEditableProperty);
        set => SetValue(IsFirstTextBoxEditableProperty, value);
    }

    // 控制第二个TextBox是否可编辑
    public static readonly DependencyProperty IsSecondTextBoxEditableProperty =
        DependencyProperty.Register("IsSecondTextBoxEditable", typeof(bool), typeof(CustomTextBoxContainer), new PropertyMetadata(false));
    
    public bool IsSecondTextBoxEditable
    {
        get => (bool)GetValue(IsSecondTextBoxEditableProperty);
        set => SetValue(IsSecondTextBoxEditableProperty, value);
    }

    // 控制第三个TextBox是否可编辑
    public static readonly DependencyProperty IsThirdTextBoxEditableProperty =
        DependencyProperty.Register("IsThirdTextBoxEditable", typeof(bool), typeof(CustomTextBoxContainer), new PropertyMetadata(false));
    
    public bool IsThirdTextBoxEditable
    {
        get => (bool)GetValue(IsThirdTextBoxEditableProperty);
        set => SetValue(IsThirdTextBoxEditableProperty, value);
    }
}

2. 添加布尔反转转换器
   因为IsEditable为true对应TextBox的IsReadOnly为false，需要转换器反转布尔值：

public class InverseBoolConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return !(bool)value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return !(bool)value;
    }
}

3. 编写ContentControl模板

<Window.Resources>
    <local:InverseBoolConverter x:Key="InverseBoolConverter"/>
    <ControlTemplate x:Key="ContentControl1" TargetType="{x:Type local:CustomTextBoxContainer}">
        <StackPanel>
            <TextBox IsReadOnly="{Binding IsFirstTextBoxEditable, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}"/>
            <TextBox IsReadOnly="{Binding IsSecondTextBoxEditable, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}"/>
            <TextBox IsReadOnly="{Binding IsThirdTextBoxEditable, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}"/>
        </StackPanel>
    </ControlTemplate>
</Window.Resources>

4. 场景使用

• 窗口1（全部不可编辑，默认属性值为false，无需额外设置）：

<local:CustomTextBoxContainer DockPanel.Dock="Top" Template="{StaticResource ContentControl1}"/>

• 窗口2（第一、第三个TextBox可编辑）：

<local:CustomTextBoxContainer DockPanel.Dock="Top" Template="{StaticResource ContentControl1}"
                              IsFirstTextBoxEditable="True"
                              IsThirdTextBoxEditable="True"/>

方案二：附加属性（无需自定义控件） #

通过附加属性给原生ContentControl标记编辑权限，模板中绑定这些附加属性实现控制。

1. 定义附加属性类

public static class TextBoxEditPermissions
{
    public static readonly DependencyProperty IsFirstEditableProperty =
        DependencyProperty.RegisterAttached("IsFirstEditable", typeof(bool), typeof(TextBoxEditPermissions), new PropertyMetadata(false));
    
    public static void SetIsFirstEditable(UIElement element, bool value)
    {
        element.SetValue(IsFirstEditableProperty, value);
    }
    
    public static bool GetIsFirstEditable(UIElement element)
    {
        return (bool)element.GetValue(IsFirstEditableProperty);
    }

    // 同理添加IsSecondEditable、IsThirdEditable附加属性
}

2. 修改模板绑定附加属性

<ControlTemplate x:Key="ContentControl1" TargetType="{x:Type ContentControl}">
    <StackPanel>
        <TextBox IsReadOnly="{Binding Path=(local:TextBoxEditPermissions.IsFirstEditable), RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}"/>
        <TextBox IsReadOnly="{Binding Path=(local:TextBoxEditPermissions.IsSecondEditable), RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}"/>
        <TextBox IsReadOnly="{Binding Path=(local:TextBoxEditPermissions.IsThirdEditable), RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}"/>
    </StackPanel>
</ControlTemplate>

3. 场景使用

• 窗口1（全部不可编辑）：

<ContentControl DockPanel.Dock="Top" Template="{StaticResource ContentControl1}"/>

• 窗口2（部分可编辑）：

<ContentControl DockPanel.Dock="Top" Template="{StaticResource ContentControl1}"
                local:TextBoxEditPermissions.IsFirstEditable="True"
                local:TextBoxEditPermissions.IsThirdEditable="True"/>

内容的提问来源于stack exchange，提问作者mukul nagpal