获取组中所选RadioButton的索引

本文关键字：RadioButton 索引 获取 | 更新日期: 2023-09-27 18:18:15

我有一个参考的RadioButton rb1。
如何获得rb1组中所选RadioButton的索引?
我用谷歌搜索了一会儿，但没有成功。

如有任何帮助，不胜感激

获取组中所选RadioButton的索引

对你的问题的简短回答是你不知道。你应该做的是将RadioButton.IsChecked绑定到视图模型的某些bool属性。您可以通过IValueConverter的实现绑定视图模型的int属性来实现类似于组索引的功能:

View Model属性:

private int _groupIndex = 1;
public int GroupIndex
{
   get { return _groupIndex; }
   set
   {
       if (_groupIndex == value) return;
       _groupIndex = value;
       OnPropertyChanged("GroupIndex");
   }
}

转换器:

public class IndexBooleanConverter : IValueConverter
{
  public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  {
      if (value == null || parameter == null)
          return false;
      else
          return (int)value == System.Convert.ToInt32(parameter);
  }
  public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  {
      if (value == null || parameter == null)
          return null;
      else if ((bool)value)
          return System.Convert.ToInt32(parameter);
      else
          return DependencyProperty.UnsetValue;
  }
}

然后像这样绑定:

<StackPanel Orientation="Horizontal">
   <StackPanel.Resources>
       <local:IndexBooleanConverter x:Key="IndexBooleanConverter"/>
   </StackPanel.Resources>
   <RadioButton Content="Option1" IsChecked="{Binding Path=GroupIndex, Converter={StaticResource IndexBooleanConverter}, ConverterParameter=1}"/>
   <RadioButton Content="Option2" IsChecked="{Binding Path=GroupIndex, Converter={StaticResource IndexBooleanConverter}, ConverterParameter=2}"/>
   <RadioButton Content="Option3" IsChecked="{Binding Path=GroupIndex, Converter={StaticResource IndexBooleanConverter}, ConverterParameter=3}"/>
</StackPanel>

在这种情况下，你的视图模型属性GroupIndex将有值1,2或3取决于什么RadioButton勾选

如果你走到这一步，那么你的设计可能有问题，你应该重新考虑。

也就是说，你可以遍历可视树并找到它，像这样:

        /// Returns the first GroupBox ancester            
        public DependencyObject  FindAncestor(DependencyObject current)
        {
            current = VisualTreeHelper.GetParent(current);
            while (current != null)
            {
                if (current is GroupBox)
                {
                    return (T)current;
                }
                current = VisualTreeHelper.GetParent(current);
            };
            return null;
        }

然后遍历子元素，找到选中的radioButton

    public RadioButton FindChild<T>(DependencyObject parent)       
    {
        // Confirm parent and childName are valid.
        if (parent == null) return null;
        RadioButton foundChild = null;
        int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            // If the child is not of the request child type child
            var childType = child as radioButton;
            if (childType == null)
            {
                // recursively drill down the tree
                foundChild = FindChild(child);
                // If the child is found, break so we do not overwrite the found child.
                if (foundChild != null) return foundChild ;
            }
            else if (childName.IsChecked == true)
            {
               return foundChild;  
            }
        }
        return null;
    }
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