EntityFramework 数据校验异常处理

public void Insert(PageHost entity)
{
    try
    {
        db.pagehost.Add(entity);
        db.SaveChanges();
    }
    catch (DbEntityValidationException ep)
    {
        CatchException(ep);
    }
    catch (Exception ep)
    {
        throw ep;
    }
}
 
private void CatchException(DbEntityValidationException ep)
{
    StringBuilder sb = new StringBuilder();
    foreach (DbEntityValidationResult item in ep.EntityValidationErrors)
    {
        foreach (string pp in item.Entry.OriginalValues.PropertyNames)
        {
            sb.AppendLine(item.Entry.Member(pp).CurrentValue.ToString());
        }
        foreach (DbValidationError i in item.ValidationErrors)
        {
            throw new Exception(string.Format("{0}\t{1}\t{2}", i.PropertyName, i.ErrorMessage, sb.ToString()));
        }
    }
}