wpf,visibility属性的多元素绑定及值转换
visibility实现多元素绑定。
实现多绑定转换
public class VisibilityConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values.Length == 2 && values[0] != null && values[1] != null)
{
if ((values[0].ToString() + values[1].ToString()).Length > 10)
{
return Visibility.Visible;
}
else
{
return Visibility.Collapsed;
}
}
else
{
return Visibility.Collapsed;
}
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
使用资源style对元素设置visibility多元素绑定
<Window> <Window.Resource>
<ResourceDictionary>
<ConvertTool:VisibilityConverter x:Key="VisibilityValueConvert" />
<Style x:key="MultiBindingStyle" TargetType="TextBlock">
<Setter Property="Visibility">
<Setter.Value>
<MultiBinding Converter="{StaticResource ResourceKey=VisibilityValueConvert}"><!--被使用的资源需在使用前定义-->
<Binding ElementName="text1" Path="Text" />
<Binding ElementName="text2" Path="Text" />
</MultiBinding>
</Setter.Value>
</Setter>
</Style>
</ResourceDicionary>
</Window.Resource>
</Window>
界面
<TextBox x:Name="text1"/> <TextBox x:Name = "text2"/> <TextBlock Text="字符长度大于10" Style = "{StaticResource MultiBindingStyle}"/>