C#之List集合去重复对象的实现方法

 list<string> str_list = new list<string> { "1", "2", "3", "3" ,"4","5","5"};

var distinctlist = str_list.distinct();

var reginfolist= new list<reginfo>
{
    new reginfo { id=a1001, name="test1",desc="阿莫西林"},
    new reginfo { id=a1001, name="test1",desc="阿莫西林" },
    new reginfo { id=a1002, name="test2",desc="葡萄糖注射液"},
    new reginfo { id=b1003, name="test3",desc="氯化钠注射液"},
    new reginfo { id=c1002, name="test4",desc="吗丁啉"}
 };

list<reginfo> distinctreginfo = reginfolist
  .groupby(p => new {p.id, p.name} )
  .select(g => g.first())
  .tolist();

var distinctlist = reginfolist.groupby(x => x.id).select(y => y.first());
var distinctlist = reginfolist.groupby(x => x.id).select(y => y.firstordefault());