[英]How to bind data to a control's Visibility property
我知道控件的Visibility
属性不能像其他属性一样绑定到数据。 它需要某种转换器(?)。 在尝试从这个问题实现解决方案时,我遇到了一个编译器错误: The resource "BoolToVisible" could not be resolved
。 我猜我必须创建一个名为BoolToVisible
的ResourceKey
,我只是不知道如何。
我要求有人告诉我绑定到控件的Visibility属性的正确方法。
*我添加的控件是一个单选按钮。 *我的数据模型中有一个isVisible
的bool
属性,该属性将绑定到此单选按钮。
数据模型属性:
private bool _isVisible = true;
public bool IsVisible
{
get { return _isVisible; }
set
{
_isVisible = value;
NotifyPropertyChange(() => IsVisible);
}
}
XAML:
<RadioButton Visibility="{Binding DataModel.IsVisible,Converter={StaticResource ResourceKey=BoolToVisible},RelativeSource={RelativeSource TemplatedParent}}" ... />
谢谢。
2个例子:
第一个使用像问题中所述的转换器:
public class BooleanToVisibilityConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null || !(value is bool))
return Binding.DoNothing;
return (bool)value ? Visibility.Visible : Visibility.Collapsed;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return value;
}
}
在xaml中:
<Window x:Class="Stackoverflow.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:local="clr-namespace:Stackoverflow"
>
<Window.Resources>
<local:BooleanToVisibilityConverter x:Key="booleanToVisibiltyConverter"/>
</Window.Resources>
<Grid>
<Button Visibility="{Binding IsSomeThing,Converter={StaticResource booleanToVisibiltyConverter}}"/>
</Grid>
第二 :
在您的DataContext中,您可以保持一个可见性属性
cs:
private Visibility _myControlVisibility;
public Visibility MyControlVisibility
{
get { return _myControlVisibility; }
set { _myControlVisibility = value; }
}
xaml:
<Button Visibility="{Binding MyControlVisibility}"/>
您可以使用属性绑定可见性,只需要具有“可见性”的“依赖关系属性”字段:
Public Property MyVisibility As Windows.Visibility
Get
Return GetValue(MyVisibilityProperty)
End Get
Set(ByVal value As Windows.Visibility)
SetValue(MyVisibilityProperty, value)
End Set
End Property
Public Shared ReadOnly MyVisibilityProperty As DependencyProperty = _
DependencyProperty.Register("MyVisibility", _
GetType(Windows.Visibility), GetType(MyWindow), _
New PropertyMetadata(Nothing))
然后像往常一样进行绑定(代码在VB中)。
请记住,在New PropertyMetadata中,您可以为对象设置初始状态,例如:
Public Shared ReadOnly MyVisibilityProperty As DependencyProperty = _
DependencyProperty.Register("MyVisibility", _
GetType(Windows.Visibility), GetType(MyWindow), _
New PropertyMetadata(Windows.Visibility.Hidden))
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