Mvc EF 修改数据贼郁闷，老是出错
- C# code
public bool Edit(Student sd) { Student ss = new Student(); ss.t_id = sd.t_id; ss.t_sname = sd.t_sname; ss.t_state = sd.t_state; ll.ApplyCurrentValues<Student>("Student",ss) ll.SaveChanges(); return true; }老是错误，是在是很无奈了，student里边只有三个字段，全部赋值了还是出错，出错信息为
ObjectStateManager 中找不到其键与所提供对象的键相匹配的对象。请确认所提供对象的键值与必须向其应用更改的对象的键值相匹配。
有点无奈，求指点，如果一个实体中有的字段我不想给他值怎么办啊，全给都出错，
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- C# code
using (var edm = new NorthwindEntities()) { Customers addc = edm.Customers.FirstOrDefault(cc => cc.CustomerID == "c2"); addc.City = "CD"; addc.ContactName = "cnblogs"; addc.Country = "CN"; int result = edm.SaveChanges(); Assert.AreEqual(result, 1); Customers updatec = edm.Customers.FirstOrDefault(cc => cc.CustomerID == "c2"); Console.WriteLine("CustomerId={0},City={1}", updatec.CustomerID, updatec.City); }