SQL中的in和not in语法对应的LINQ写法

List<testInfo> listAll = new List<testInfo>();
listAll.Add(new testInfo() { id = 1, name = "11", test = "111" });
listAll.Add(new testInfo() { id = 2, name = "22", test = "222" });
listAll.Add(new testInfo() { id = 3, name = "33", test = "333" });
listAll.Add(new testInfo() { id = 4, name = "33", test = "333" });  

List<testInfo> listFind = new List<testInfo>();
listFind.Add(new testInfo() { id = 1, name = "44", test = "111" });
listFind.Add(new testInfo() { id = 2, name = "22", test = "222" });
listFind.Add(new testInfo() { id = 3, name = "33", test = "333" });
listFind.Add(new testInfo() { id = 4, name = "55", test = "333" });
//SQL中的in和not in语法对应的LINQ写法
//相当于查询语句：select * from listAll p where p.name not in(select f.name from listFind)
var a = (from p in listAll
         where !(from f in listFind select f.name).Contains(p.name)
         select p).ToList();

2.分页查询

int pageSize = 20;//每页记录数
int pageIndex=1;//当前页
        //分页
       list = (from p in list
             select p).Skip(pageSize * (pageIndex - 1)).Take(pageSize).ToList();