Creating a dictionary from another dictionary using LINQ

Question

I have a dictionary of the type:

IDictionary> my_dictionary

bar class looks like this:

cl         


        

Answer 1

Something like this?

my_dictionary
    .Where(p=> p.Value.Any(x => x.IsValid))
    .ToDictionary( p=> p.Key,
                   p=> p.Value.Where (x => x.IsValid));

That will only include items where at least one of the values IsValid.

Answer 2

my_dictionary.Where(p => p.Any(v => v.Value.IsValid())
             .ToDictionary(p=> p.Key,
                           p=> p.Value.Where(x => x.Value.IsValid());

Get Only the Items that have a true in the Value, then only get the items that are true into the new dictonary.

Filter then create the dictonary

Answer 3

var new_dict = my_dictionary.Select(x => new KeyValuePair<foo, List<bar>>(
                                                 x.Key,
                                                 x.Value
                                                  .Where(y => y.IsValid)
                                                  .ToList()))
                            .Where(x => x.Value.Count > 0)
                            .ToDictionary(x => x.Key, x => x.Value.AsReadOnly());