c# - Getting key-value combinations from a Dictionary using LINQ -

let's suppose have following dictionary:

private dictionary<string, ienumerable<string>> dic = new dictionary<string, ienumerable<string>>();  //..... dic.add("abc", new string[] { "1", "2", "3" }); dic.add("def", new string[] { "-", "!", ")" }); 

how can ienumerable<tuple<string, string>> containing following combinations:

{      { "abc", "1" },      { "abc", "2" },      { "abc", "3" },      { "def", "-" },      { "def", "!" },      { "def", ")" } } 

it not have to tuple<string, string>, seemed more appropiate type.

i looking simple linq solution if there any.

i have tried following:

var comb = dic.select(i => i.value.select(v => tuple.create<string, string>(i.key, v))); 

but comb ends being of type ienumerable<ienumerable<tuple<string, string>>>.

you want enumerable.selectmany flatten out ienumerable<ienumerable<t>>:

var comb = dic.selectmany(i => i.value.select(                                v => tuple.create(i.key, v))); 

which yields: