如何从另一个控件中绑定到自定义控件按钮可见性

Question

我有一个自定义控件,它有一个按钮:

<UserControl x:Class="Gambit.Views.FileSelectionControl"
    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" 
    SnapsToDevicePixels="True" 
    mc:Ignorable="d">
    ...
    <Button Content="Load" 
            Margin="5,5,5,5" 
            Height="22" 
            Width="70" 
            IsDefault="True" 
            IsEnabled="{Binding SelectedFileExists}" 
            AttachedCommand:CommandBehavior.Event="Click" 
            AttachedCommand:CommandBehavior.Command="{Binding CloseDialogCommand}"/>
    ...
</UserControl>

我希望在另一个控件中包含此控件,但我想Load在主机控件中设置按钮的可见性; 就像是

<UserControl x:Class="Gambit.Views.SomeOtherControl"
    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" 
    SnapsToDevicePixels="True" 
    mc:Ignorable="d">
    ...
    <GroupBox Header="Select Test Data">
        <Views:FileSelectionControl <Here Set the Load Button Visibility>/>
    </GroupBox>
    ...
</UserControl>

在哪里<Here Set the Load Button Visibility>显示我想设置控件的可见性.如何完成[不破坏MVVM模式]？

谢谢你的时间.

Answer 1

你可以DependencyProperty在你的UserControl:

public partial class SomeView : UserControl
{
    ...

    public static DependencyProperty ButtonVisibilityProperty = DependencyProperty.Register("ButtonVisibility", typeof(Visibility), typeof(SomeView));

    public Visibility ButtonVisibility
    {
        get { return (Visibility)GetValue(ButtonVisibilityProperty); }
        set { SetValue(ButtonVisibilityProperty, value); }
    }
}

绑定到Button.Visibility:

<UserControl x:Class="WpfApplication2.SomeView"
             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">
    <Button Visibility="{Binding RelativeSource={RelativeSource AncestorType={x:Type UserControl}}, Path=ButtonVisibility}" Content="My Button"/>
</UserControl>

然后你可以Visibility从外面控制如下:

<local:SomeView ButtonVisibility="Collapsed"/>

因为它是一个DependencyProperty你可以使用Binding,以及