Linq2Sql：如何重新创建联合选择

Question

我想在Linq2Sql中重新创建以下内容

SqlStr = "SELECT RefNo, Title, Allocation, GenralMenu, AdminMenu, Redundant 
FROM Menus UNION SELECT 0,  '', '', 0, 0, 0 ORDER BY Title"

不幸的是，我的尝试并没有取得丰硕成果。有办法做到这一点吗？ 或者我需要

• 从菜单中选择记录
• 插入我的工会＆＃34;记录到提取的列表中
• 按标题排序列表

Answer 1

好的，我已经解决了我的问题如下

Dim dc As New DiaryDataContext
Dim menuList = (From m In dc.Menus
                Select m)

Dim dl As List(Of Menu)
dl = menuList.ToList
dl.Insert(0, New Menu With{.RefNo = 0,
                           .Title = "",
                           .Value = "",
                           .GeneralMenu = False,
                           .AdminMenu = False,
                           .Redundant = False})
gv_Menus.DataSource = dl
gv_Menus.DataBind()

比原始SQL稍长但有效......

Answer 2

您需要使用插入/选择
语法示例：

INSERT INTO Table1 
SELECT Table2.column1  AS column1, Table2.column2 AS column2
from table2
WHERE Table2.column3 > 100

---

LINQ2SQL

context
  .Table1
  .InsertAllOnSubmit(
    context
      .Table2
      .Where( ... )
      .Select(b => new A { ... })
  );