C# 如何将可见性绑定到在用户控件中作为参数传递的元素？

我有

用户控件

，如下所示：

public partial class TopBarUserControl : UserControl
{
    public System.Windows.Visibility menuVisibility { get; set; }

    public TopBarUserControl()
    {
        InitializeComponent();
    }
}

在我的另一页中，我使用：

<local:TopBarUserControl />

---

或者在

code-behind

中设置它，但我不知道应该在哪里设置它。

这里有两件事，首先，理想情况下，您应该将属性声明为

dependencProperty

，这样您就可以绑定它并获得自动更改通知，以便在正确的时间更新UI。然后，您需要更正绑定，使其指向在

UserCoontrol

级别声明的属性（编写时，它绑定到

DataContext

，这可能无法设置）

在XAML中尝试以下操作：

<UserControl x:Class="WpfApplication1.TopBarUserControl"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
             x:Name="MainControl">   <!--Give a XAML name to the whole control to bind to properties declared in code-behind-->

    <Menu Visibility="{Binding ElementName=MainControl, Path=MenuVisibility}"/>
</UserControl>

---

您需要创建一个依赖项属性。

Visibility="{Binding menuVisibility}"

<UserControl x:Class="WpfApplication1.TopBarUserControl"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
             x:Name="MainControl">   <!--Give a XAML name to the whole control to bind to properties declared in code-behind-->

    <Menu Visibility="{Binding ElementName=MainControl, Path=MenuVisibility}"/>
</UserControl>

using System.Windows;
using System.Windows.Controls;

namespace WpfApplication1
{
    public partial class TopBarUserControl : UserControl
    {
        public static readonly DependencyProperty MenuVisibilityProperty = DependencyProperty.Register("MenuVisibility", typeof(Visibility), typeof(TopBarUserControl), null);

        public Visibility MenuVisibility
        {
            get { return (Visibility)GetValue(MenuVisibilityProperty); }
            set { SetValue(MenuVisibilityProperty, value); }
        }

        public TopBarUserControl()
        {
            InitializeComponent();
        }
    }
}