Sorting ListCollectionView with CustomSort

本文关键字：CustomSort with ListCollectionView Sorting | 更新日期: 2023-09-27 18:08:29

我正试图排序ListCollectionView，但我不能让它工作。我有自己的CustomSort，它抛出以下错误:

不能隐式地将类型'SceneComparer'转换为'IComparer'。一个存在显式转换。(你错过了演员吗?)

我的比较器是这样的:

public class SceneComparer : IComparer<Scene>
{
    // Assumes that a scene is either numeric, or numeric + alpha.
    private readonly Regex sceneRegEx = new Regex(@"('d*)('w*)", RegexOptions.Compiled);
    public int Compare(Scene x, Scene y)
    {
        var firstSceneMatch = this.sceneRegEx.Match(x.SceneNumber);
        var firstSceneNumeric = Convert.ToInt32(firstSceneMatch.Groups[1].Value);
        var firstSceneAlpha = firstSceneMatch.Groups[2].Value;
        var secondSceneMatch = this.sceneRegEx.Match(y.SceneNumber);
        var secondSceneNumeric = Convert.ToInt32(secondSceneMatch.Groups[1].Value);
        var secondSceneAlpha = secondSceneMatch.Groups[2].Value;
        if (firstSceneNumeric < secondSceneNumeric)
        {
            return -1;
        }
        if (firstSceneNumeric > secondSceneNumeric)
        {
            return 1;
        }
        return string.CompareOrdinal(firstSceneAlpha, secondSceneAlpha);
    }
}

这里是ViewModel

中的排序
private ListCollectionView _scenesNavigator;
public ListCollectionView ScenesNavigator
{
    get
    {
        _scenesNavigator = SceneCollectionView;
        _scenesNavigator.CustomSort = new SceneComparer(); ----> ERROR
        _scenesNavigator.IsLiveSorting = true;
        return _scenesNavigator;
    }
    set
    {
        _scenesNavigator = value; RaisePropertyChanged();
    }
}
public SourceViewModel()
{
        SceneCollectionView = Application.Current.Resources["SceneCollectionView"] as ListCollectionView;
}

如何解决这个问题?

Sorting ListCollectionView with CustomSort

CustomSort是IComparer (msdn)的类型。

示例:

http://weblogs.asp.net/monikadyrda/wpf-listcollectionview-for-sorting-filtering-and-grouping 

public class SortCreaturesByAge : IComparer
{
    public int Compare( object x, object y )
    {
        if( x as CreatureModel == null && y as CreatureModel == null )
        {
            throw new ArgumentException( "SortCreatures can 
                                    only sort CreatureModel objects." );
        }
        if( ((CreatureModel) x).Age > ((CreatureModel) y).Age )
        {
            return 1;
        }
        return -1;
    }
}
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