List<string[]> zissekiList = new List<string[]> { new[]{ " 10", " りんご"}, new[]{ " 20" , " みかん"}, };
// record = new string[] {"20", "みかん"}; がセットされる string[]? record = zissekiList.Find(cols => cols?[0] == "20");
string[] record = zissekiList.Find(cols => cols[0] == "20");
var records = zissekiList.FindAll(cols => cols?[0] == "20");
string fruits0 = zissekiList.Find(cols => cols[0] == "20")[1]; string fruits1 = zissekiList.Single(cols => cols[0] == "20")[1]; string fruits2 = zissekiList.First(cols => cols[0] == "20")[1]; string fruits3 = zissekiList.SingleOrDefault(cols => cols[0] == "20")[1]; string fruits4 = zissekiList.FirstOrDefault(cols => cols[0] == "20")[1];
string fruits0 = zissekiList.Find(cols => cols[0] == "20")?[1];