linq里面似in的查询

1.linq里面似in的查询

List<string> source = new List<string>{ "aaa", "bbb" };

List<string> px = new  List<string> { "aaa", "bbb", "ccc" };

var q = from s in source

from p in px

where s==p

select s;

2. 得到集合里面是  p.DState in （1, 100,200 ）的集合

List<int> pp = new  List<int> { 1, 100,200 };

if (queryString == "AllState")

{

DataSouce = new ObservableCollection<DocRegister>((from p in _returnList

from ids in pp

where p.DState == ids

select p).ToList());

}

3.根据一个条件过滤数据集合queryString是条件

DataSouce = new ObservableCollection<DocRegister>(_returnList.Where(p => p.DState == Convert.ToInt32(queryString)).ToList());