C#/.NET/WPF:从LINQ而不是IEnumerable获取子集

我有一些琐碎的代码如下所示:

SortedDictionary<String, long> d = new SortedDictionary<String, long>();
// d is then populated with an expensive time-consuming process

ListBox lb = new ListBox();
lb.ItemsSource = d;                                      // THIS WORKS GREAT

现在我要做的是动态显示字典的一个子集,而不必重新计算它。

// min is assigned somewhere else
lb.ItemsSource = d.SkipWhile( kvp => kvp.Value < min );  // THIS DOESN'T WORK

.SkipWhile()返回一个IEnumerable,这对于foreach循环很好,但是对于ItemsSource就不那么热门了。

B) 如果做不到这一点,有没有办法做到:

// Put things back, like the .ToArray() syntax
d.SkipWhile( kvp => kvp.Value < min).ToSortedDictionary();

C) 如果做不到这一点,有没有办法有条件地从实际词典中删除条目?

d.RemoveWhere( kvp => kvp.Value < min );

更新 :

// This is what I was seeing and seemed strange
Console.WriteLine("Total = " + dict.Count");
Console.WriteLine(" Skip = " + dict.SkipWhile( kvp => kvp.Value < 3 ).Count());
foreach ( var kvp in dict.SkipWhile( kvp => kvp.Value < 3 ) ) {
  Console.WriteLine( kvp );
}

导致:

Total = 33350
 Skip = 33350
[ 0, 1042 ]
[ 00, 52 ]
[ 000, 55 ] 
[ 001, 1 ]
[ 002, 1 ]
[ 003, 1 ]
...

我没想到。值小于3的行。