Question

我有以下LINQ查询：

vm.Ter = (from tr in DataContext.Terr_Rp
          join dm in DataContext.Dt_Mrs
          on tr.T_ID equals dm.D_ID + "00" 
          select tr).ToList();

我需要找到那些没有匹配的。意思是没有加入。我试过不等于但是C＃有问题。

Answer 1

使用!Any()应该可以解决问题。

vm.Ter = (from tr in DataContext.Terr_Rp
          where !DataContext.Dt_Mrs.Any(dm => tr.T_ID == dm.D_ID + "00")
          select tr).ToList();

Answer 2

var list1 = new List<int>{1,2,3,4,5,6};
var list2 = new List<int>{5,6,7,8,9,10};

var result = from l1 in list1 where !list2.Contains(l1) select l1;

result: {1,2,3,4}

LINQ查找没有连接的记录

2 个答案: