private void btnSaveArticle_Click(object sender, RoutedEventArgs e)
        {
            //if (_documentManager.SaveDocument())
            //{

            //    MessageBox.Show("保存成功!");
            //}

            //TextRange range = new TextRange(body.Document.ContentStart, body.Document.ContentEnd);
            Article article = new Article();
            article.ArticleTitle = tbArticleTitle.Text;
            article.ArticleContent = rtbArticleBody.RTF();
            //article.AUserID = ClassRoom.Common.TicketInfo.UserNO;
            article.AUserID = 4;
            article.UploadTime = DateTime.Now;
            ClassRoomEntities entities = new ClassRoomEntities();
              try
                {
                entities.Articles.AddObject(article);

                int result =entities.SaveChanges();
                if (result > 0)
                    MessageBox.Show("保存成功");
            }
            catch (Exception ee)
            {
                throw ee.InnerException;
            }
        }