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单条数据删除，用DeleteOnSubmit
NorthwindDataContext db = new NorthwindDataContext(); Customer test1 = ctx.Customers.Single(c => c.CustomerID == 1); db.t_sysrole.DeleteOnSubmit(test1); db.SubmitChanges();
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原文地址：http://www.cnblogs.com/dekevin/p/5640220.html
