[英]How to bind data to a control's Visibility property
我知道控件的Visibility
屬性不能像其他屬性一樣綁定到數據。 它需要某種轉換器(?)。 在嘗試從這個問題實現解決方案時,我遇到了一個編譯器錯誤: The resource "BoolToVisible" could not be resolved
。 我猜我必須創建一個名為BoolToVisible
的ResourceKey
,我只是不知道如何。
我要求有人告訴我綁定到控件的Visibility屬性的正確方法。
*我添加的控件是一個單選按鈕。 *我的數據模型中有一個isVisible
的bool
屬性,該屬性將綁定到此單選按鈕。
數據模型屬性:
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}}" ... />
謝謝。
2個例子:
第一個使用像問題中所述的轉換器:
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,您可以保持一個可見性屬性
cs:
private Visibility _myControlVisibility;
public Visibility MyControlVisibility
{
get { return _myControlVisibility; }
set { _myControlVisibility = value; }
}
xaml:
<Button Visibility="{Binding MyControlVisibility}"/>
您可以使用屬性綁定可見性,只需要具有“可見性”的“依賴關系屬性”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))
然后像往常一樣進行綁定(代碼在VB中)。
請記住,在New PropertyMetadata中,您可以為對象設置初始狀態,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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