对ObservableCollection< T>进行排序 [英] Sorting ObservableCollection<T>

问题描述

我有两个单独的可观察集合，其中T是用户定义的类.这些集合绑定到列表视图和树视图.我想按排序顺序显示集合的项目.我似乎在列表"和树"视图上找不到任何排序功能.集合中的元素可以在运行时删除/添加.实现此目标的最佳方法是什么?

I have Two separate observable Collection where T is a user defined class. These collections are binded to List View and Tree View. I want to show the items of the collections in sorted order. I don't seem to find any sort function on the List and Tree view. Elements in Collections can be removed/added on run time. What is the best way to achieve this?

先谢谢了.干杯！

推荐答案

通过扩展ObservableCollection<T>类，您可以使用内部Move方法非常轻松地实现此行为.这是一个简化的示例:

You can implement this behaviour yourself quite easily using the internal Move method by extending the ObservableCollection<T> class. Here is a simplified example:

public class SortableObservableCollection<T> : ObservableCollection<T>
{
    public SortableObservableCollection(IEnumerable<T> collection) : 
        base(collection) { }

    public SortableObservableCollection() : base() { }

    public void Sort<TKey>(Func<T, TKey> keySelector)
    {
        Sort(Items.OrderBy(keySelector));
    }

    public void Sort<TKey>(Func<T, TKey> keySelector, IComparer<TKey> comparer)
    {
        Sort(Items.OrderBy(keySelector, comparer));
    }

    public void SortDescending<TKey>(Func<T, TKey> keySelector)
    {
        Sort(Items.OrderByDescending(keySelector));
    }

    public void SortDescending<TKey>(Func<T, TKey> keySelector, 
        IComparer<TKey> comparer)
    {
        Sort(Items.OrderByDescending(keySelector, comparer));
    }

    public void Sort(IEnumerable<T> sortedItems)
    {
        List<T> sortedItemsList = sortedItems.ToList();
        for (int i = 0; i < sortedItemsList.Count; i++)
        {
            Items[i] = sortedItemsList[i];
        }
    }
}

感谢@ThomasLevesque获得上面显示的更有效的Sort方法

然后您可以像这样使用它:

You can then use it like this:

YourCollection.Sort(c => c.PropertyToSortBy);

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