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();
