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var user = context.User.Where(u => u.Name == "hello").FirstOrDefault();
context.DeleteObject(user);
4:http://www.cnblogs.com/haogj/archive/2012/04/04/2430494.html
5:可以用Log4Net 参考http://blog.csdn.net/fangxing80/article/details/6359041
或者 var ss=from p in db.test select p;
string sql=ss.Tostring();得到SQL