[英]Entity framework 4 not binding properly to datagridview
我正在运行以下代码:
private void btnMatchFull_Click(object sender, EventArgs e)
{
Match m = Regex.Match(txtIP.Text, "(?<HostIP>[A-Z0-9.]{13}).(?<SubIP>[A-Z0-9.]{13})");
string host = m.Groups["HostIP"].Value;
string sub = m.Groups["SubIP"].Value;
var abc = (from x in _db.HostIPs
where x.Value == host
from s in x.SubIPs
where s.Value == sub
select s.Nicks).ToList();
dgvNicks.DataSource = abc;
}
但是,与其给我刻痕的实体集合,不如给我一个刻痕的实体集合,每个刻有“值”字段的刻痕都会在datagrid视图中给出……
这些表肯定有数据,并且我在以前的项目中一直使用EF,但它的行为并非如此。.所以我不知道为什么。
edmx就像这样:
编辑:
我试过了
var abc = (from x in _db.HostIPs
where x.Value == host
from s in x.SubIPs
where s.Value == sub
select s.Nicks).ToList();
并得到相同的结果。
您缺少投影:
var abc = (from x in _db.HostIPs
where x.Value == host
from s in x.SubIPs
where s.Value == sub
from n in s.Nicks
select n).ToList();
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