我如何绑定是否选择某个组的任何/无“RadioButton”
本文关键字:任何 RadioButton 何绑定 绑定 选择 是否 | 更新日期: 2023-09-27 18:01:34
如何绑定是否检查某组的RadioButton
?
假设有4个RadioButton
s。最初没有选中它们,因此"next"按钮被禁用。用户必须做出选择,才能启用"下一步"按钮,并能够继续。
第一个解决方案效率不高,因为每个新的RadioButton都需要添加额外的DataTrigger:
<StackPanel>
<RadioButton Name="x1"/>
<RadioButton Name="x2"/>
<RadioButton Name="x3"/>
<RadioButton Name="x4"/>
<Button Content="Click">
<Button.Style>
<Style TargetType="Button">
<Setter Property="IsEnabled" Value="False"/>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=x1, Path=IsChecked}" Value="True">
<Setter Property="IsEnabled" Value="True"/>
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=x2, Path=IsChecked}" Value="True">
<Setter Property="IsEnabled" Value="True"/>
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=x3, Path=IsChecked}" Value="True">
<Setter Property="IsEnabled" Value="True"/>
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=x4, Path=IsChecked}" Value="True">
<Setter Property="IsEnabled" Value="True"/>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</StackPanel>
后者又基于MVVM。你在ViewModel中创建属性IsChecked,当任何RadioButton被选中时,它将IsChecked值设置为True,你的按钮基于这个值设置它的IsEnabled属性。
XAML :
<StackPanel>
<StackPanel.Resources>
<Style TargetType="RadioButton">
<Setter Property="Command" Value="{Binding RadioButtonCheckedCommand}"/>
</Style>
</StackPanel.Resources>
<RadioButton Name="x1"/>
<RadioButton Name="x2"/>
<RadioButton Name="x3"/>
<RadioButton Name="x4"/>
<Button Content="Click" IsEnabled="{Binding IsChecked}"/>
</StackPanel>
ViewModel :
class MainViewModel : INotifyPropertyChanged
{
private bool _isChecked;
public bool IsChecked
{
get { return _isChecked; }
set
{
_isChecked = value;
OnPropertyChanged();
}
}
private RelayCommand _radioButtonCheckedCommand;
public RelayCommand RadioButtonCheckedCommand
{
get
{
return _radioButtonCheckedCommand ??
(_radioButtonCheckedCommand = new RelayCommand(() => IsChecked = true));
}
}
public void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
public event PropertyChangedEventHandler PropertyChanged;
}