How can I use LINQ to “crop” a dictionary?

Question

I have a dictionary and a list of keys to remove from the dictionary. This is my implementation right now:

var keys = (from entry in etimes
            where Convert.ToInt64(entry.Value) < Convert.ToInt64(stime)
            select entry.Key).ToList();

foreach (var key in keys)
{
    etimes.Remove(key);
    count--;
}

Is there something I can do to eliminate the foreach loop?

Answer 1

var pruned = etimes.Where(entry => Convert.ToInt64(entry.Value) >= 
    Convert.ToInt64(stime)).ToDictionary(entry => entry.Key, 
        entry => entry.Value);

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Answer 2

, , :

<Extension> void itemDelete(List l, object item) {
    l.Remove(item)
}

var keys = (from entry in etimes
        where Convert.ToInt64(entry.Value) < Convert.ToInt64(stime)
        select entry.Key).ToList();

keys.foreach(itemDelete());

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