How to combine dictionaries in Linq? -

How to combine dictionaries in Linq? -

i'm new linq. have code this:

public class info { public dictionary<string,int> wordfrequency; } list<data> datalist;

what want 1 aggregated dictionary combined wordfrequency whole list of info objects. know how using loops (iterate on list, iterate on each dictionary), question is, linq syntax this? give thanks you.

edit: here (untested) looping approach, can see mean.

public static dictionary<string, int> combine() { dictionary<string, int> result; foreach (data info in datalist) { foreach (string key in data.wordfrequencies.keys) { if(!result.containskey(key)) result[key] = 0; result[key] += data.wordfrequencies[key]; } } }

so want flatten dictionaries single one, has no duplicate keys - of course?

you can utilize enumerable.selectmany flatten , enumerable.groupby grouping keys.

dictionary<string, int> allwordfrequency = datalist .selectmany(d => d.wordfrequency) .groupby(d => d.key) .todictionary(g => g.key, g => g.sum(d => d.value));

i have presumed want sum frequencies.

linq