EF异常字段捕捉

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1. using (NorthwindEntities ctx = new NorthwindEntities())  
2.             {  
3.                 try  
4.                 {  
5.                     //ctx.Employees.Attach(entity);  
6.                     ctx.Entry(entity).State = System.Data.EntityState.Modified;  
7.                     return ctx.SaveChanges();  
8.                 }  
9.                 catch (DbEntityValidationException ex)  
10.                 {  
11.                     foreach (var item in ex.EntityValidationErrors)  
12.                     {  
13.                         foreach (var item2 in item.ValidationErrors)  
14.                         {  
15.                             error = string.Format("{0}:{1}\r\n", item2.PropertyName, item2.ErrorMessage);  
16.                         }  
17.                     }  
18.                 }