Validation failed for one or more entities. See 'EntityValidationErrors' property for more details

http://stackoverflow.com/questions/7795300/validation-failed-for-one-or-more-entities-see-entityvalidationerrors-propert

捕获异常之后，判断是否为DbEntityValidationException

var e = exception as DbEntityValidationException;
            if (e != null)
            {
                foreach (var eve in e.EntityValidationErrors)
                {
                    Console.WriteLine("Entity of type "{0}" in state "{1}" has the following validation errors:",
                        eve.Entry.Entity.GetType().Name, eve.Entry.State);
                    foreach (var ve in eve.ValidationErrors)
                    {
                        Console.WriteLine("- Property: "{0}", Value: "{1}", Error: "{2}"",
                            ve.PropertyName,
                            eve.Entry.CurrentValues.GetValue<object>(ve.PropertyName),
                            ve.ErrorMessage);
                    }
                }
            }