WPF DataGrid - 折叠除第一个以外的所有组 [英] WPF DataGrid - collapse all groups except the first one

问题描述

我有一个DataGrid分组的ItemsSource。每个组有一个扩展器，所以我可以扩展/折叠所有组。现在，我试图默认折叠所有组，但让第一组展开。项目源是动态的，所以我不能构建任何转换器来检查组名称。我必须按组索引来执行。

是否可以在XAML中执行？或代码隐藏？

请帮忙。

请问，

Paul

解决方案

这可能有点迟了，但为了帮助类似的问题，在这种情况下，定义一个Visual tree helper class将会很有帮助。

  //视觉树助手类
 public static class VisualTreeHelper 
 {
 public static Collection< T> GetVisualChildren< T>（DependencyObject current）其中T：DependencyObject 
 {
 if（current == null）
 return null; 
 
 var children = new Collection< T>（）; 
 GetVisualChildren（current，children）; 
返回孩子; 
} 
 private static void GetVisualChildren< T（DependencyObject current，Collection< T> child）其中T：DependencyObject 
 {
 if（current！= null）
 {
 if（current.GetType（）== typeof（T））
 children.Add（（T）current）; （int i = 0; i< System.Windows.Media.VisualTreeHelper.GetChildrenCount（current）; i ++）
 
 GetVisualChildren（System.Windows.Media。 VisualTreeHelper.GetChild（current，i），children）; 
} 
} 
} 
} 
 
 //那么你可以这样使用上面的类：
 Collection< Expander> collection = VisualTreeHelper.GetVisualChildren< Expander>（dataGrid1）; 
 
 foreach（扩展器扩展器在集合中）
 expander.IsExpanded = false; 
 
 collection [0] .IsExpanded = true; 
  

信用额为这个论坛

i have a DataGrid with grouped ItemsSource. There are an expander on each group, so i can expand/collapse all the groups. Now, i'm trying to collapse all groups by default, but leave the first group expanded. The items source is dynamic, so i can't build any converter to check the group name. I must do it by group index.

Is it possible to do in in XAML? Or in code-behind?

Please, help.

Kind regards,

Paul

解决方案

This might be a little late, but in order to help with similar problems, defining a "Visual tree helper class" would be helpful in this case.

    // the visual tree helper class
public static class VisualTreeHelper
{
    public static Collection<T> GetVisualChildren<T>(DependencyObject current) where T : DependencyObject
    {
        if (current == null)
            return null;

        var children = new Collection<T>();
        GetVisualChildren(current, children);
        return children;
    }
    private static void GetVisualChildren<T>(DependencyObject current, Collection<T> children) where T : DependencyObject
    {
        if (current != null)
        {
            if (current.GetType() == typeof(T))
                children.Add((T)current);

            for (int i = 0; i < System.Windows.Media.VisualTreeHelper.GetChildrenCount(current); i++)
            {
                GetVisualChildren(System.Windows.Media.VisualTreeHelper.GetChild(current, i), children);
            }
        }
    }
}

// then you can use the above class like this:
Collection<Expander> collection = VisualTreeHelper.GetVisualChildren<Expander>(dataGrid1);

    foreach (Expander expander in collection)
        expander.IsExpanded = false;

collection[0].IsExpanded = true;

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