不知道有没有误解你的意思
string[] addressDatas = new string[0];
string pUserInput = "";
string[] keyWords = pUserInput.Split (' ', ',');
var result = from tar in addressDatas
where keyWords.Count (r => tar.Contains (r)) > 1//符合的数量
select tar;
或者进阶一点
string[] addressDatas = new string[0];
string pUserInput = "";
string[] keyWords = pUserInput.Split (' ', ',');
var result = from tar in addressDatas
let num = keyWords.Count (r => tar.Contains (r))
where num > 0
let anonymous = new {nNum = num,address = tar}
orderby anonymous.nNum descending
select anonymous;