xaml特殊语法

优先级绑定
PriorityBinding msdn

虚拟化数据

public class VirtualizedCollection<T> : ObservableCollection<T>,
                                        IList,
                                        ICollectionViewFactory
{
    private readonly Func<int, int, IEnumerable<T>> _dataFetcher;

    public VirtualizedCollection(Func<int, int, IEnumerable<T>> dataFetcher,
                                int totalCount)
    {
        _dataFetcher = dataFetcher;
        TotalCount = totalCount;
    }

    protected override void InsertItem(int index, T item)
    {
        if(index >= Count && index < TotalCount)
        {
            var items = _dataFetcher(index, 50); // 每次加载50条
            foreach(var it in items)
            {
                base.InsertItem(index++, it);
            }
        }
    }
}

冻结对象

var brush = new LinearGradientBrush();
brush.Freeze(); // 禁止后续修改，提升渲染性能