我有如下示例代碼：-public List<Announcement_User> announcementUser([FromBody]MyAnnouncementUser value){    MySqlConnection conn = WebApiConfig.conn();    MySqlCommand query = conn.CreateCommand();    query.CommandText = "select a.title,a.description,a.date_created,ua.read,ua.announcement_id,ua.user_announcement_id from announcement a left join user_announcement ua on a.announcement_id = ua.announcement_id where ua.user_id = @user_id";    query.Parameters.AddWithValue("@user_id", value.user_id);    var prodWishlist = new List<Announcement_User>();    try    {        conn.Open();    }    catch (MySql.Data.MySqlClient.MySqlException ex)    {        prodWishlist.Add(new Announcement_User(null, null,null, false, 0, 0, ex.ToString()));    }    MySqlDataReader fetch_query = query.ExecuteReader();    while (fetch_query.Read())    {        prodWishlist.Add(new Announcement_User(fetch_query["title"].ToString(), fetch_query["description"].ToString(), fetch_query["date_created"].ToString(), (bool)fetch_query["read"], fetch_query.GetInt32(4), fetch_query.GetInt32(5), null));    }    conn.Close();    return prodWishlist;}我遇到了如下錯(cuò)誤：-"Message": "發(fā)生錯(cuò)誤。","ExceptionMessage": "指定的演員表無(wú)效。","ExceptionType": "System.InvalidCastException",現(xiàn)在懷疑是bool導(dǎo)致的錯(cuò)誤。我可以知道如何為 bool in(fetch_query.Read()) 編寫(xiě)正確的方法嗎？請(qǐng)幫忙。謝謝你。