我有form2在我的表中添加了一个新数据，然后出现了以下错误：

{"Only TimeSpan objects can be serialized by MySqlTimeSpan"}

当我删除这部分代码时，它可以工作：

cm.Parameters.Add(New MySqlParameter("@Time_Operation",  MySqlDbType.Time)).Value = Time_OperationTextBox.Text
    cm.Parameters.Add(New MySqlParameter("@Start_Time", MySqlDbType.Time)).Value = Start_TimeTextBox.Text
    cm.Parameters.Add(New MySqlParameter("@End_Time", MySqlDbType.Time)).Value = End_TimeTextBox.Text

这意味着datetime运行良好，但这三个参数的问题，我把它们作为

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    Dim str As String = "Server=localhost;Port=3306;Database=springdb;Uid=root;Pwd=2342"

    Using con As New MySqlConnection(str)

        Dim query As String = "Insert Into springdata (full_name,rfid_tag,spring_size,operation_time,Date_Operation,
                                    Time_Operation,Start_Time,End_Time,Qty_Needed) values
                                    (@full_name, @rfid_tag, @spring_size, @operation_time,
                                    @Date_Operation, @Time_Operation, @Start_Time, @End_Time, @Qty_Needed) 
                                      " 'Note:TextBox3 is the RFID number come from RFID arduino

        Dim cm As New MySqlCommand(query, con)
        cm.Parameters.Add(New MySqlParameter("@full_name", MySqlDbType.LongText)).Value = TextBox1.Text
        cm.Parameters.Add(New MySqlParameter("@rfid_tag", MySqlDbType.LongText)).Value = TextBox2.Text
        cm.Parameters.Add(New MySqlParameter("@spring_size", MySqlDbType.MediumText)).Value = TextBox3.Text
        cm.Parameters.Add(New MySqlParameter("@operation_time", MySqlDbType.DateTime)).Value = DateTimePicker1.Value
        cm.Parameters.Add(New MySqlParameter("@Date_Operation", MySqlDbType.Date)).Value = DateTimePicker2.Value
        cm.Parameters.Add(New MySqlParameter("@Time_Operation", MySqlDbType.Time)).Value = Time_OperationTextBox.Text
        cm.Parameters.Add(New MySqlParameter("@Start_Time", MySqlDbType.Time)).Value = Start_TimeTextBox.Text
        cm.Parameters.Add(New MySqlParameter("@End_Time", MySqlDbType.Time)).Value = End_TimeTextBox.Text
        cm.Parameters.Add(New MySqlParameter("@Qty_Needed", MySqlDbType.Int32)).Value = TextBox7.Text

        con.Open()

        cm.ExecuteNonQuery()

        MessageBox.Show("success")
    End Using

End Sub