关于字典的linq查询的麻烦 <string, Dictionary<string, int> &gt;

Question

Consider the following . . .

Dictionary<string, Dictionary<string, int>> myData;

I would like to keep only the outer entries where the inner int > 1 .

myData= myData.Select(c => c.Value.Where(i => i.Value > 1));

. . . throws a conversion error.

Thanks.

EDIT

The answer @Saeed gave is doing great, but however I now need something additional. I need the outer Dictionary to only contain entries where the inner Dictionary has more than 1 entry. (Every time I think I've got it, I don't. And I'm sure it something I should be seeing!)

Answer 1

There is no outer dictionary where the int is greater than 1, because each outer dictionary "contains" as many integers as there are in its inner dictionary.

If you want to keep outer dictionaries where at least one int is greater than 1:

myData.Select(d => d.Value.Any(p => p.Value > 1));

If you want to keep outer dictionaries where all int s are greater than 1:

myData.Select(d => d.Value.All(p => p.Value > 1));

Answer 2

You should cast it to dictionary, Also you can simply use anonymous type instead of its exact type.

myData= myData
             .Select(c => new {Key = c.Key,
                           Value = c.Value
                           .Where(i => i.Value > 1)
                           .ToDictionary(y=>y.Key, y=>y.Value)})
             .ToDictionary(x=>x.Key, x=>x.Value);

Update: After doing this, for your additional requirement do:

myData = myData.Where(x=>x.Value.Count() > 1).ToDictionary(x=>x.Key,x=>x.Value);

Answer 3

If you're having trouble navigating your dictionaries, maybe the thing to do is get rid of them!

var flattened = 
  from kvp1 in myData
  let s1 = kvp1.Key
  from kvp2 in kvp1.Value
  let s2 = kvp2.Key
  let i = kvp2.Value
  select new { s1, s2, i };

Now there's a nice flat collection that you should be easily able to filter to what you want.