Question

我有一个ObservableCollection为DataGrid提供了很好的更新。

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

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

附在帖子上的是一个简单的演示应用程序，演示如何实现您想要的目标。

解决方案应该足够通用，可以重复使用，并且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

如果您在可观察的集合上有视图，则可以实现此目的。我写了一篇关于过滤Silverlight数据网格的文章。你有一个FilteredCollectionView，你可以在其上添加任何IFilter。以下是该文章的链接：

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

希望它对你有所帮助。

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

2 个答案: