DataGrid中的Silverlight DataGridRows -如何有选择地隐藏它们？

Question

我有一个正在更新的DataGrid的ObservableCollection。

要点:我想过滤(折叠)行，而不从集合中删除它们。

有没有办法做到这一点，或者像普通的.Net一样在网格上放置一个视图？

Answer 1

我刚做了published a post on my blog that addresses this exact issue。

这篇文章附带了一个简单的演示应用程序，演示了如何实现你想要的东西。

该解决方案应该足够通用，以便可重用，并基于以下自定义扩展方法：

public static class Extensions
{
    /// <summary>
    /// Applies an action to each item in the sequence, which action depends on the evaluation of the predicate.
    /// </summary>
    /// <typeparam name="TSource">The type of the elements of source.</typeparam>
    /// <param name="source">A sequence to filter.</param>
    /// <param name="predicate">A function to test each element for a condition.</param>
    /// <param name="posAction">An action used to mutate elements that match the predicate's condition.</param>
    /// <param name="negAction">An action used to mutate elements that do not match the predicate's condition.</param>
    /// <returns>The elements in the sequence that matched the predicate's condition and were transformed by posAction.</returns>
    public static IEnumerable<TSource> ApplyMutateFilter<TSource>(this IEnumerable<TSource> source,
                                                                  Func<TSource, bool> predicate,
                                                                  Action<TSource> posAction,
                                                                  Action<TSource> negAction)
    {
        if (source != null)
        {
            foreach (TSource item in source)
            {
                if (predicate(item))
                {
                    posAction(item);
                }
                else
                {
                    negAction(item);
                }
            }
        }

        return source.Where(predicate);
    }
}

Answer 2

如果你在你的可观察集合上有一个视图，你就可以做到这一点。我写了一篇关于过滤Silverlight数据网格的文章。您有一个可以添加任何IFilter的FilteredCollectionView。这是这篇文章的链接：

http://www.codeproject.com/KB/silverlight/autofiltering_silverlight.aspx

希望能对你有所帮助。