我试图读取数据从sql数据库。当我运行代码时，当涉及到它应该读取数据的位置时，它会给出一个错误。

“System.InvalidCastException:指定的强制转换无效。”

我犯了一个错误。我研究了我的错误，但找不到适合我的解决方案。虽然我编写的查询文本在ssms中工作，但在代码中不工作。

 private void pbx_frame_MouseUp(object sender, MouseEventArgs e) //
    {
        //take cropped image to picture box of crooped images
        try
        {
            string[] resim = lbx_raw_image.SelectedItem.ToString().Replace(':','.').Split('.'); 
            string sorgu_sql = "Data Source=DESKTOP-OON7EET\\SQLEXPRESS;Initial Catalog=Target;Integrated Security=True;"; //sql bağlantısı kuruldu
            //string query = "SELECT * FROM MP_Data$ WHERE time= '19.53.06'"; //'" + lbx_raw_image.SelectedItem.ToString() + "'"; //time=19.53.06 tek bir veriyi çağrır. muhtemelen yorum haline getirilen kısım olacaktı.
            string query = "SELECT * FROM MP_DATA_15_mayıs_2019$ WHERE time='" + lbx_raw_image.SelectedItem.ToString() + "'"; //12.50.23
            DB_islem db = new DB_islem(sorgu_sql, query); // 
            
            pic_info_from_MP = db.Raw_Image(pic_info_from_MP);      



    public Target Raw_Image(Target pic_info) 
    {
        sql.Open();
       
        sql_read = sql_command.ExecuteReader();

        //while (sql_read.Read())
        if (sql_read.Read())
        {
            pic_info.lat = sql_read.GetDouble(0);
            pic_info.lon = sql_read.GetDouble(1);
            pic_info.alt = sql_read.GetDouble(2);
            pic_info.yaw = sql_read.GetDouble(3);
        }

        sql.Close();

        return pic_info;
    }