我一直在使用DynamoDb進行ASP.NET項目，我已經從Db中提取了該項目并將其制作為新的Car對象。當我嘗試填充汽車的ListBox時，似乎在ListBox中沒有任何對象。這是我所擁有的：using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using Amazon.DynamoDBv2;using Amazon.DynamoDBv2.Model;using Amazon.DynamoDBv2.DocumentModel;public partial class _Default : System.Web.UI.Page{    private static AmazonDynamoDBClient client = new AmazonDynamoDBClient();    private static string tableName = "CarTable";    private static string sampleCarReg = "05-Rn-1964";    List<car> cars = new List<car>();    protected void Page_Load(object sender, EventArgs e)    {        Amazon.DynamoDBv2.DocumentModel.Table CarTable =     Amazon.DynamoDBv2.DocumentModel.Table.LoadTable(client, tableName);        GetItemOperationConfig config = new GetItemOperationConfig        {        AttributesToGet = new List<string> { "Reg", "Manufactor", "Year",     "Problems" },            ConsistentRead = true        };        Document doc = CarTable.GetItem(sampleCarReg, config);        string Reg = doc["Reg"].AsString();        string Manufactor = doc["Manufactor"].AsString();        string Year = doc["Year"].AsString();        string Problems = doc["Problems"].AsString();       // string Model = doc["Model"].AsString();        car car1 = new car(Reg, Manufactor, Year, Problems);        cars.Add(car1);        lblCar.Text = car1.ToString();        lbxCars.DataSource = cars;    }