LINQ语句

1、LINQ - select

选择单个字段

 var usaCustomers = usaSendData.Select(c =>  c.Account).Distinct().ToList();

选择多个字段

 var usaCustomers = usaSendData.Select(c => new { c.Account, c.AgentId }).Distinct().ToList();

全部映射

 var usaCustomers = usaSendData.Select(c => c).Distinct().ToList();