[英]Boolean to Cursor Converter in Xaml
我写了一个继承自IValueConverter
的转换器类。 当我使用此转换器将控件的光标绑定到CheckBox或ToggleButton的Ischecked
属性时,什么也没有发生。 这是我的BooleanToCursorConverter
类:
using System;
using System.Windows.Data;
using System.Windows.Input;
namespace Machine_Vision
{
[ValueConversion(typeof(bool?), typeof(CursorType))]
public class BooleanToCursorConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if ((bool?)value==true)
{
return CursorType.Cross;
}
else
{
return CursorType.Arrow;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}
}
这是我的XAML代码(简体):
<Window x:Class="Machine_Vision.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Machine_Vision"
mc:Ignorable="d"
Title="MainWindow"
Height="650"
Width="1300"
WindowStartupLocation="CenterScreen"
WindowState="Maximized"
Closing="Window_Closing">
<Window.Resources>
<BooleanToVisibilityConverter x:Key="B2V" />
<local:BooleanToCursorConverter x:Key="C2V" />
</Window.Resources>
<Grid>
<Image x:Name="Original_View"
Cursor="{Binding IsChecked, Converter={StaticResource C2V}, ElementName=DrawPoints}" />
<ToggleButton x:Name="DrawPoints"
Content="Draw Points"
Margin="5" />
<Grid/>
您从转换器返回了错误的值类型。 Cursor
属性只能设置为System.Windows.Input.Cursor
:
[ValueConversion(typeof(bool?), typeof(Cursor))]
public class BooleanToCursorConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if ((bool?)value == true)
{
return Cursors.Cross;
}
else
{
return Cursors.Arrow;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}
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