摘要：
System.Linq.Expressions.Expression<Func<mcs_user, bool>> expr1 = u => u.email_address == email; var user = GetFirst(expr1); Func<mcs_user, bool> expr2 = u => u.email_address == email; var user1 = GetFirst1(expr2); var user = GetFirst(u => u.email_address == email); return 阅读全文
