对于值1,2或3,将一组3个radiobuttons绑定到int类型属性的最简单方法是什么?
答案 0 :(得分:80)
我提出了一个简单的解决方案。
我有一个带有以下内容的model.cs类:
private int _isSuccess;
public int IsSuccess { get { return _isSuccess; } set { _isSuccess = value; } }
我有Window1.xaml.cs文件,DataContext设置为model.cs。 xaml包含radiobuttons:
<RadioButton IsChecked="{Binding Path=IsSuccess, Converter={StaticResource radioBoolToIntConverter}, ConverterParameter=1}" Content="one" />
<RadioButton IsChecked="{Binding Path=IsSuccess, Converter={StaticResource radioBoolToIntConverter}, ConverterParameter=2}" Content="two" />
<RadioButton IsChecked="{Binding Path=IsSuccess, Converter={StaticResource radioBoolToIntConverter}, ConverterParameter=3}" Content="three" />
这是我的转换器:
public class RadioBoolToIntConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
int integer = (int)value;
if (integer==int.Parse(parameter.ToString()))
return true;
else
return false;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return parameter;
}
}
当然,在Window1的资源中:
<Window.Resources>
<local:RadioBoolToIntConverter x:Key="radioBoolToIntConverter" />
</Window.Resources>
答案 1 :(得分:32)
实际上,使用像这样的转换器会打破双向绑定,加上我上面所说的,你也不能使用枚举。更好的方法是使用针对ListBox的简单样式,如下所示:
注意:与DrWPF.com在他们的示例中所说的相反,不将ContentPresenter放入RadioButton中,否则如果您添加包含按钮或其他内容的项目,您将无法设置焦点或与之交互。这种技术解决了这个问题。此外,您需要处理文本的灰色以及删除标签上的边距,否则它将无法正确呈现。这种风格也适合你。
<Style x:Key="RadioButtonListItem" TargetType="{x:Type ListBoxItem}" >
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<DockPanel LastChildFill="True" Background="{TemplateBinding Background}" HorizontalAlignment="Stretch" VerticalAlignment="Center" >
<RadioButton IsChecked="{TemplateBinding IsSelected}" Focusable="False" IsHitTestVisible="False" VerticalAlignment="Center" Margin="0,0,4,0" />
<ContentPresenter
Content = "{TemplateBinding ContentControl.Content}"
ContentTemplate = "{TemplateBinding ContentControl.ContentTemplate}"
ContentStringFormat = "{TemplateBinding ContentControl.ContentStringFormat}"
HorizontalAlignment = "{TemplateBinding Control.HorizontalContentAlignment}"
VerticalAlignment = "{TemplateBinding Control.VerticalContentAlignment}"
SnapsToDevicePixels = "{TemplateBinding UIElement.SnapsToDevicePixels}" />
</DockPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="RadioButtonList" TargetType="ListBox">
<Style.Resources>
<Style TargetType="Label">
<Setter Property="Padding" Value="0" />
</Style>
</Style.Resources>
<Setter Property="BorderThickness" Value="0" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="ItemContainerStyle" Value="{StaticResource RadioButtonListItem}" />
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBox}">
<ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="TextBlock.Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</Style.Triggers>
</Style>
<Style x:Key="HorizontalRadioButtonList" BasedOn="{StaticResource RadioButtonList}" TargetType="ListBox">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel Background="Transparent" Orientation="Horizontal" />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
您现在拥有单选按钮的外观,但您可以进行双向绑定,并且可以使用枚举。这是怎么......
<ListBox Style="{StaticResource RadioButtonList}"
SelectedValue="{Binding SomeVal}"
SelectedValuePath="Tag">
<ListBoxItem Tag="{x:Static l:MyEnum.SomeOption}" >Some option</ListBoxItem>
<ListBoxItem Tag="{x:Static l:MyEnum.SomeOtherOption}">Some other option</ListBoxItem>
<ListBoxItem Tag="{x:Static l:MyEnum.YetAnother}" >Yet another option</ListBoxItem>
</ListBox>
此外,由于我们明确地将传递ListBoxItem的样式分离出来而不是将其置于内联中,再次如其他示例所示,您现在可以创建一个新样式来自定义每个项目的内容,例如作为间距。 (如果你只是尝试将ListBoxItem作为键控样式来覆盖通用控件目标,那么这将不起作用。)
这是一个在每个项目的上方和下方放置6的边距的示例。 (注意你必须通过ItemContainerStyle属性显式地应用样式,而不是简单地在ListBox的资源部分中定位ListBoxItem,原因如上所述。)
<Window.Resources>
<Style x:Key="SpacedRadioButtonListItem" TargetType="ListBoxItem" BasedOn="{StaticResource RadioButtonListItem}">
<Setter Property="Margin" Value="0,6" />
</Style>
</Window.Resources>
<ListBox Style="{StaticResource RadioButtonList}"
ItemContainerStyle="{StaticResource SpacedRadioButtonListItem}"
SelectedValue="{Binding SomeVal}"
SelectedValuePath="Tag">
<ListBoxItem Tag="{x:Static l:MyEnum.SomeOption}" >Some option</ListBoxItem>
<ListBoxItem Tag="{x:Static l:MyEnum.SomeOtherOption}">Some other option</ListBoxItem>
<ListBoxItem Tag="{x:Static l:MyEnum.YetAnother}" >Ter another option</ListBoxItem>
</ListBox>
答案 2 :(得分:24)
我很惊讶没有人想出这种解决方案来绑定bool数组。它可能不是最干净的,但它可以很容易地使用:
private bool[] _modeArray = new bool[] { true, false, false};
public bool[] ModeArray
{
get { return _modeArray ; }
}
public int SelectedMode
{
get { return Array.IndexOf(_modeArray, true); }
}
在XAML中:
<RadioButton GroupName="Mode" IsChecked="{Binding Path=ModeArray[0], Mode=TwoWay}"/>
<RadioButton GroupName="Mode" IsChecked="{Binding Path=ModeArray[1], Mode=TwoWay}"/>
<RadioButton GroupName="Mode" IsChecked="{Binding Path=ModeArray[2], Mode=TwoWay}"/>
注意:如果您不想在默认情况下选中一个,则不需要双向绑定。 TwoWay绑定是此解决方案的最大缺点。
优点:
答案 3 :(得分:15)
我知道这是过时的方式,但我有一个替代解决方案,它更轻,更简单。从System.Windows.Controls.RadioButton
派生一个类,并声明两个依赖属性RadioValue
和RadioBinding
。然后在类代码中,覆盖OnChecked
并将RadioBinding
属性值设置为RadioValue
属性值的值。在另一个方向上,trap使用回调更改为RadioBinding
属性,如果新值等于RadioValue
属性的值,则将其IsChecked
属性设置为{{1 }}
以下是代码:
true
XAML用法:
public class MyRadioButton : RadioButton
{
public object RadioValue
{
get { return (object)GetValue(RadioValueProperty); }
set { SetValue(RadioValueProperty, value); }
}
// Using a DependencyProperty as the backing store for RadioValue.
This enables animation, styling, binding, etc...
public static readonly DependencyProperty RadioValueProperty =
DependencyProperty.Register(
"RadioValue",
typeof(object),
typeof(MyRadioButton),
new UIPropertyMetadata(null));
public object RadioBinding
{
get { return (object)GetValue(RadioBindingProperty); }
set { SetValue(RadioBindingProperty, value); }
}
// Using a DependencyProperty as the backing store for RadioBinding.
This enables animation, styling, binding, etc...
public static readonly DependencyProperty RadioBindingProperty =
DependencyProperty.Register(
"RadioBinding",
typeof(object),
typeof(MyRadioButton),
new FrameworkPropertyMetadata(
null,
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
OnRadioBindingChanged));
private static void OnRadioBindingChanged(
DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
MyRadioButton rb = (MyRadioButton)d;
if (rb.RadioValue.Equals(e.NewValue))
rb.SetCurrentValue(RadioButton.IsCheckedProperty, true);
}
protected override void OnChecked(RoutedEventArgs e)
{
base.OnChecked(e);
SetCurrentValue(RadioBindingProperty, RadioValue);
}
}
希望有人在这段时间后发现这个有用:)
答案 4 :(得分:1)
有时可以在模型中解决它,如下所示: 假设您有3个布尔属性OptionA,OptionB,OptionC。
XAML:
<RadioButton IsChecked="{Binding OptionA}"/>
<RadioButton IsChecked="{Binding OptionB}"/>
<RadioButton IsChecked="{Binding OptionC}"/>
CODE:
private bool _optionA;
public bool OptionA
{
get { return _optionA; }
set
{
_optionA = value;
if( _optionA )
{
this.OptionB= false;
this.OptionC = false;
}
}
}
private bool _optionB;
public bool OptionB
{
get { return _optionB; }
set
{
_optionB = value;
if( _optionB )
{
this.OptionA= false;
this.OptionC = false;
}
}
}
private bool _optionC;
public bool OptionC
{
get { return _optionC; }
set
{
_optionC = value;
if( _optionC )
{
this.OptionA= false;
this.OptionB = false;
}
}
}
你明白了。 不是最干净的事情,但很容易。
答案 5 :(得分:1)
Aviad P.s 的回答效果很好。但是,我必须更改相等检查以比较 OnRadioBindingChanged 中的字符串,否则将枚举与字符串值进行比较,并且最初没有检查单选按钮。
private static void OnRadioBindingChanged(
DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
BindableRadioButton rb = (BindableRadioButton) d;
if (rb.RadioValue.Equals(e.NewValue?.ToString()))
{
rb.SetCurrentValue(IsCheckedProperty, true);
}
}
答案 6 :(得分:0)
这个例子可能看起来有点冗长,但其意图应该非常明确。
它在ViewModel中使用3个布尔属性,称为FlagForValue1
,FlagForValue2
和FlagForValue3
。
这三个属性中的每一个都由一个名为_intValue
的私有字段支持。
视图(xaml)的3个单选按钮每个都绑定到视图模型中对应的Flag属性。这意味着显示“值1”的单选按钮绑定到视图模型中的FlagForValue1
bool属性,并相应地绑定到其他两个。
在视图模型中设置其中一个属性(例如FlagForValue1
)时,重要的是还要为其他两个属性(例如FlagForValue2
和FlagForValue3
)引发属性更改事件所以UI(WPF INotifyPropertyChanged
基础设施)可以正确选择/取消选择每个单选按钮。
private int _intValue;
public bool FlagForValue1
{
get
{
return (_intValue == 1) ? true : false;
}
set
{
_intValue = 1;
RaisePropertyChanged("FlagForValue1");
RaisePropertyChanged("FlagForValue2");
RaisePropertyChanged("FlagForValue3");
}
}
public bool FlagForValue2
{
get
{
return (_intValue == 2) ? true : false;
}
set
{
_intValue = 2;
RaisePropertyChanged("FlagForValue1");
RaisePropertyChanged("FlagForValue2");
RaisePropertyChanged("FlagForValue3");
}
}
public bool FlagForValue3
{
get
{
return (_intValue == 3) ? true : false;
}
set
{
_intValue = 3;
RaisePropertyChanged("FlagForValue1");
RaisePropertyChanged("FlagForValue2");
RaisePropertyChanged("FlagForValue3");
}
}
xaml看起来像这样:
<RadioButton GroupName="Search" IsChecked="{Binding Path=FlagForValue1, Mode=TwoWay}"
>Value 1</RadioButton>
<RadioButton GroupName="Search" IsChecked="{Binding Path=FlagForValue2, Mode=TwoWay}"
>Value 2</RadioButton>
<RadioButton GroupName="Search" IsChecked="{Binding Path=FlagForValue3, Mode=TwoWay}"
>Value 3</RadioButton>
答案 7 :(得分:0)
我使用转换器返回的Binding.DoNothing
来提出解决方案,但不会破坏双向绑定。
public class EnumToCheckedConverter : IValueConverter
{
public Type Type { get; set; }
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value != null && value.GetType() == Type)
{
try
{
var parameterFlag = Enum.Parse(Type, parameter as string);
if (Equals(parameterFlag, value))
{
return true;
}
}
catch (ArgumentNullException)
{
return false;
}
catch (ArgumentException)
{
throw new NotSupportedException();
}
return false;
}
else if (value == null)
{
return false;
}
throw new NotSupportedException();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value != null && value is bool check)
{
if (check)
{
try
{
return Enum.Parse(Type, parameter as string);
}
catch(ArgumentNullException)
{
return Binding.DoNothing;
}
catch(ArgumentException)
{
return Binding.DoNothing;
}
}
return Binding.DoNothing;
}
throw new NotSupportedException();
}
}
用法:
<converters:EnumToCheckedConverter x:Key="SourceConverter" Type="{x:Type monitor:VariableValueSource}" />
单选按钮绑定:
<RadioButton GroupName="ValueSource"
IsChecked="{Binding Source, Converter={StaticResource SourceConverter}, ConverterParameter=Function}">Function</RadioButton>
答案 8 :(得分:0)
我基于Aviad的答案创建了一个附加属性,不需要创建新的类
public static class RadioButtonHelper
{
[AttachedPropertyBrowsableForType(typeof(RadioButton))]
public static object GetRadioValue(DependencyObject obj) => obj.GetValue(RadioValueProperty);
public static void SetRadioValue(DependencyObject obj, object value) => obj.SetValue(RadioValueProperty, value);
public static readonly DependencyProperty RadioValueProperty =
DependencyProperty.RegisterAttached("RadioValue", typeof(object), typeof(RadioButtonHelper), new PropertyMetadata(new PropertyChangedCallback(OnRadioValueChanged)));
private static void OnRadioValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is RadioButton rb)
{
rb.Checked -= OnChecked;
rb.Checked += OnChecked;
}
}
public static void OnChecked(object sender, RoutedEventArgs e)
{
if (sender is RadioButton rb)
{
rb.SetCurrentValue(RadioBindingProperty, rb.GetValue(RadioValueProperty));
}
}
[AttachedPropertyBrowsableForType(typeof(RadioButton))]
public static object GetRadioBinding(DependencyObject obj) => obj.GetValue(RadioBindingProperty);
public static void SetRadioBinding(DependencyObject obj, object value) => obj.SetValue(RadioBindingProperty, value);
public static readonly DependencyProperty RadioBindingProperty =
DependencyProperty.RegisterAttached("RadioBinding", typeof(object), typeof(RadioButtonHelper), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, new PropertyChangedCallback(OnRadioBindingChanged)));
private static void OnRadioBindingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is RadioButton rb && rb.GetValue(RadioValueProperty).Equals(e.NewValue))
{
rb.SetCurrentValue(RadioButton.IsCheckedProperty, true);
}
}
}
用法:
<RadioButton GroupName="grp1" Content="Value 1"
helpers:RadioButtonHelper.RadioValue="val1" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>
<RadioButton GroupName="grp1" Content="Value 2"
helpers:RadioButtonHelper.RadioValue="val2" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>
<RadioButton GroupName="grp1" Content="Value 3"
helpers:RadioButtonHelper.RadioValue="val3" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>
<RadioButton GroupName="grp1" Content="Value 4"
helpers:RadioButtonHelper.RadioValue="val4" helpers:RadioButtonHelper.RadioBinding="{Binding SelectedValue}"/>