c# - Flatten List<string[]> into single string with one line for each element -
i have instance of type list<string[]> convert string each string[] on newline. i'm using following linq query flatten out list i'm not sure how can add new line between each string[] without expanding query far more ugly. there way without gutting query , using string.join or ienumberable.aggregate inside foreach loop? results.selectmany(x => x).aggregate((c, n) => c + ", " + n) string.join(environment.newline, results.select(a => string.join(", ", a))); complete sample: var results = new list<string[]> { new[]{"this", "should", "be", "on"}, new[]{"other", "line"} }; var result = string.join(environment.newline, results.select(a => string.join(", ", a))); result: this, should, be, on other, line update here aggregation done right - uses stringbuilder build single string in memory results.aggregat