从任何地方更新 Usercontrol 中的 TextBox.Text

Question

我面临一个似乎经常出现的问题，并且有很多解决方案，但我很抱歉，我不能/不能申请我的情况。让我总结一下拓扑：我有一个带有网格的主窗口 (MainWindow)，在底部单元格中，我放置了一个由我编写的用户控件 (UC_StatusMonitor)，带有一个用户控件 (LBL_CONN_Message) 内的文本框，我想在其中更新操作结果（例如“连接到设备 X”、“无法从 Y 读取数据”、“缺少字段”等）。这基本上用于通知用户某些事情是对还是错。我知道我必须使用 Dependancy 来解决这个问题，但我的实现不起作用（肯定我错过了一些东西）。

让我展示一下代码：

MainWindows.xaml

<Window x:Class="LUX.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:LUX"
        mc:Ignorable="d"
        Title="LUX" Name ="MainForm" Height="600" Width="800"  MinHeight="600" MinWidth="800">

    <Border Padding="10">

        <Grid Name="Main_Grid">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="160"/>
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="100"/>
                <RowDefinition Height="*"/>
                <RowDefinition Height="22"/>
            </Grid.RowDefinitions>

            <!-- others controls ....   -->


            <!-- Monitor   -->
            <StackPanel Name="Stack_Monitor" Grid.Row="2" Grid.Column="1">
                <Grid Name="BottomBar" Height="20">
                    <local:UC_StatusMonitor Height="100" Grid.Row="2" Grid.Column="1"/>
                </Grid>
            </StackPanel>
        </Grid>



    </Border>
</Window>

然后是控件的代码

UC_StatusMonitor.xaml

<UserControl x:Class="LUX.UC_StatusMonitor"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:LUX"
             mc:Ignorable="d" 
             xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"
             d:DesignHeight="20" d:DesignWidth="300">
    <Grid Name="UCR_Base" Background="White">
        <WrapPanel>
            ...
            <TextBox Name="LBL_CONN_Message" Margin = "10 0 0 0" VerticalAlignment="Center" IsReadOnly="True" BorderThickness="0" Text="{Binding MyTextProperty, ElementName=control}"/>
            ...
        </WrapPanel>
    </Grid>
</UserControl>

UC_StatusMonitor.xaml.cs

namespace LUX {
    /// <summary>
    /// Interaction logic for StatusMonitor.xaml
    /// </summary>
    public partial class UC_StatusMonitor : UserControl
    {
        Button[] MenuButtons;

        //// The dependency property which will be accessible on the UserControl
        public static readonly DependencyProperty MyTextPropertyProperty = DependencyProperty.Register("MyTextProperty", typeof(string), typeof(UC_StatusMonitor), new UIPropertyMetadata(String.Empty));

        public string MyTextProperty
        {
            get { return (string)GetValue(MyTextPropertyProperty); }
            set { SetValue(MyTextPropertyProperty, value); }

所以，我期望在任何地方（在所有进入工作区的类中，我都声明了一个状态监视器静态对象），我应该使用类似的指令

MyTextProperty = "已连接";

然后在文本框上看到这条消息进入用户控件。

显然，不会发生 :(

感谢和问候

Answer 1

我已经设法让 UserControl 与 Binding 一起使用。
以下是我的做法：
UserControlWithBinding.xaml:

<UserControl x:Class="SO_app.UserControlWithBinding"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:local="clr-namespace:SO_app"
         mc:Ignorable="d" 
         d:DesignHeight="20" d:DesignWidth="300">
<Grid Name="IAmGroot"> <!-- Name this grid as you want as this is what we will use for internal Binding -->
    <TextBlock Text="{Binding Status}"/><!-- Because this grid is bound to the control it self you will always use this property, unless you rename it :-) -->
</Grid>

现在UserControlWithBinding.xaml.cs后面的代码：

/// <summary>
/// Interaction logic for UserControlWithBinding.xaml
/// </summary>
public partial class UserControlWithBinding : UserControl
{
    public UserControlWithBinding()
    {
        InitializeComponent();
        IAmGroot.DataContext = this;// this is where we set the data context for the grid so it uses the UserControl and not the inherited one. This will allow us to have the DataContext for User Control to be still inherited but the grid will look into a UserControl as an object to assign it to it's data context.
    }

    public string Status
    {
        get { return (string)GetValue(StatusProperty); }
        set { SetValue(StatusProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Status.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty StatusProperty =
        DependencyProperty.Register("Status", typeof(string), typeof(UserControlWithBinding), new PropertyMetadata(null));//note that I am using null and not string.Empty


}  

---

现在让我们在 xaml 中使用我们的控件：

<local:UserControlWithBinding Status="{Binding PropertyThatYouWantToBindThisControlsText}"/>  

这应该可以解决您的问题。