我是wpf的新手，我想将富文本框的数据及其格式（斜体，彩色，粗体..）存储到数据库（Mysql）中。目前，当我保存数据时，格式化将被忽略。此外，当我将其从数据库加载回富文本框时，它会在同一行中显示所有文本。期待您的帮助和建议！

public void save()
    {

        MySqlConnection conn = new MySqlConnection(connString);
        MySqlCommand command = conn.CreateCommand();      
        string richText = new TextRange(rt1.Document.ContentStart,  rt1.Document.ContentEnd).Text;

        string s = WebUtility.HtmlEncode(richText); 
        command.Parameters.AddWithValue("@s", s);           
        command.CommandText = "insert into proc_tra (procedures) values (@s)";
        conn.Open();
        command.ExecuteNonQuery();
        conn.Close();
    }

public void load()

    {   MySqlConnection conn = new MySqlConnection(connString);
        MySqlCommand command = conn.CreateCommand();
        command.CommandText = "select * from proc_tra where id_pt=4";
        rt1.Document.Blocks.Clear();            
        conn.Open();            
        MySqlDataReader dr;
        dr = command.ExecuteReader();
        string k="";           
        while (dr.Read())
        {              
            k += dr["procedures"].ToString();
        }
        var p = new Paragraph();
        var run = new Run();
        run.Text = WebUtility.HtmlDecode(k);
        p.Inlines.Add(run);
        rt1.Document.Blocks.Add(p);
    }