Question

 var iquery = (from m in dc.m_MAILBOXes 
            join o in dc.o_ORGANIZATIONs on m.m_o_ID equals o.o_ID
            join h in dc.h_HOSTED_EXCHANGE_ACCOUNTs on  o.o_ID  equals h.h_o_ID
            join my in dc.my_MAILBOX_SUMMARies on m.m_ID equals my.my_m_ID
            orderby my.my_START_DATE descending
          select new { MailboxName = m.m_NAME, OrgName = o.o_NAME, MailboxStatus = m.m_STATUS,
          LatestEndDate = my.my_END_DATE, AccountStatus = h.h_STATUS }).Where(r => r.MailboxName == "test@hetest.com"));

这是我使用的查询以及where条件并且不返回任何结果。我完全不确定我哪里出错了。当我删除where条件查询返回结果以及mailboxname等于“test@hetest.com”的条目时。

var result = iquery .Select(var => new MailBoxReconEntry
                                  {
                                      AccountStatus = var.AccountStatus, LatestEndDate = var.LatestEndDate, 
                                      MailboxStatus = var.MailboxStatus,
                                      OrgName = var.OrgName
                                  }).ToList();

Answer 1

不应该在主LINQ请求中使用where语句，

LINQ请求转换为SQL，因此where语句应该是LINQ Query的一部分而不是

之后

所以

 var iquery = (from m in dc.m_MAILBOXes 
        join o in dc.o_ORGANIZATIONs on m.m_o_ID equals o.o_ID
        join h in dc.h_HOSTED_EXCHANGE_ACCOUNTs on  o.o_ID  equals h.h_o_ID
        join my in dc.my_MAILBOX_SUMMARies on m.m_ID equals my.my_m_ID
        where m.MailboxName == "test@hetest.com"
        orderby my.my_START_DATE descending

有点粗糙，但应该给你一个想法？

使用where where条件时，LINQ查询不会返回任何结果

1 个答案: