[英]How to do an Inner Join in LINQ
我有一条Linq语句,可将数据检索到我的JAVASCRIPT表中。 我想做的是显示广告活动的归档者。 我需要将其加入我的MSCDB.Tbl_Users到Campaign表中。 有人可以尝试给我一些帮助吗? 我对LINQ相当陌生。
MSCDatabaseDataContext MSCDB = new MSCDatabaseDataContext();
var q = from row in MSCDB.Tbl_Campaigns
where row.CampaignStatus == 4
select new ArchiveReport
{
CampaignId = row.CampaignId,
CampaignName = row.CampaignName,
CampaignDescription = row.CampaignDescription,
CurrentStatus = row.EndDate >= DateTime.Now && row.StartDate <= DateTime.Now ? "Active" : row.StartDate >= DateTime.Now ? "Pending" : row.CampaignStatus == 4 ? "Archived" : "Closed",
CampaignStartDatesS = Convert.ToDateTime(row.StartDate).Date + " - " + Convert.ToDateTime(row.EndDate).Date,
Discount = Convert.ToInt32(row.Discount),
Target = Convert.ToInt32(row.Target),
Uptake = Convert.ToInt32(row.Uptake),
DateArchived = Convert.ToDateTime(row.DateArchived),
ArchivedBy = Convert.ToInt32(row.ArchivedBy)
};
我不确定您的数据库结构如何,但是如果Tbl_Users
具有CampaignId
,则应该这样:
MSCDatabaseDataContext MSCDB = new MSCDatabaseDataContext();
var q = from row in MSCDB.Tbl_Campaigns
//here is your join
join usr in MSCDB.Tbl_Users on row.CampaignId equals usr.CampaignId
//-------------------------
where row.CampaignStatus == 4
select new ArchiveReport
{
//Here how you can jet values from user table
UserName = usr.Name,
//-------------------------
CampaignId = row.CampaignId,
CampaignName = row.CampaignName,
CampaignDescription = row.CampaignDescription,
CurrentStatus = row.EndDate >= DateTime.Now && row.StartDate <= DateTime.Now ? "Active" : row.StartDate >= DateTime.Now ? "Pending" : row.CampaignStatus == 4 ? "Archived" : "Closed",
CampaignStartDatesS = Convert.ToDateTime(row.StartDate).Date + " - " + Convert.ToDateTime(row.EndDate).Date,
Discount = Convert.ToInt32(row.Discount),
Target = Convert.ToInt32(row.Target),
Uptake = Convert.ToInt32(row.Uptake),
DateArchived = Convert.ToDateTime(row.DateArchived),
ArchivedBy = Convert.ToInt32(row.ArchivedBy)
};
示例代码为
var q= from row in MSCDB.Tbl_Campaigns
join user in MSCDB.Tbl_Users
on row.UserId equals user.ID
select row;
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