Slicing a FormCollection by keys that start with a certain string

Question

Is there a nice linqy way of splitting a FormCollection into a Dictionary that contains only those keys that start wi

Answer 1

If you're looking for a "nice" way of taking an existing dictionary, producing a new dictionary with copies of keys+values, for a subset of the keys, some LINQ code will do this nicely:

var appSettings = formCollection.AllKeys
    .Where(k => k.StartsWith("AppSettings."))
    .ToDictionary(k => k, k => formCollection[k]);