可以使用LINQ to SQL查询使用NOT IN?使用“NOT IN”进行LINQ to SQL查询
如SELECT的au_lname,状态从作者的WHERE状态NOT IN( 'CA', 'IN', 'MD')
可以使用LINQ to SQL查询使用NOT IN?使用“NOT IN”进行LINQ to SQL查询
如SELECT的au_lname,状态从作者的WHERE状态NOT IN( 'CA', 'IN', 'MD')
List<string> states = new List<string> { "CA", "IN", "MD" };
var q = from a in authors
where !states.Contains(a.state)
select new { a.au_lname, a.state };
或
var q = authors.Where(a => !states.Contains(a.state))
.Select(a => new { a.au_lname, a.state });
这里有一个例子:
NorthwindDataContext dc = new NorthwindDataContext();
dc.Log = Console.Out;
var query =
from c in dc.Customers
where !(from o in dc.Orders
select o.CustomerID)
.Contains(c.CustomerID)
select c;
foreach (var c in query) Console.WriteLine(c);
您可以使用Contains:
var states = new[] {"CA", "IN", "MD"};
var query = db.Authors.Where(x => !states.Contains(x.state));
是的!
下面是一个例子,从代码中,我们已经写了:
List<long> badUserIDs = new List { 10039309, 38300590, 500170561 };
BTDataContext dc = new BTDataContext();
var items = from u in dc.Users
where !badUserIDs.Contains(u.FbUserID)
select u;
生成的SQL结果是:
{SELECT [t0].[UserID], [t0].[FbUserID], [t0].[FbNetworkID], [t0].[Name], FROM [dbo].[Users] AS [t0] WHERE NOT ([t0].[FbUserID] IN (@p0, @p1, @p2)) }
有没有真正需要做的子查询 - 中包含/!包含将在主查询的上下文中工作。 – Rob 2008-12-05 17:04:23