捕捉Entity framework 6的详细异常提示

 1 try
 2         {
 3             return base.SaveChanges();
 4         }
 5         catch (DbEntityValidationException ex)
 6         {
 7             var errorMessages = ex.EntityValidationErrors
 8                     .SelectMany(x => x.ValidationErrors)
 9                     .Select(x => x.ErrorMessage);
10 
11             var fullErrorMessage = string.Join("; ", errorMessages);
12 
13             var exceptionMessage = string.Concat(ex.Message, " The validation errors are: ", fullErrorMessage);
14 
15             throw new DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors);
16         }