为什么我的ASP.NET ListBox没有填充结果？

Question

我一直在使用DynamoDb进行ASP.NET项目，我已经从Db中提取了该项目并将其制作为新的Car对象。当我尝试填充汽车的ListBox时，似乎在ListBox中没有任何对象。

这是我所拥有的：

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;

    }

Answer 1

您正在设置ListBox的DataSource属性，但未指定DataTextField和DataValueField。您需要设置Car中使用的属性ListBox。// Use what makes sense to youlbxCars.DataSource = cars;lbxCars.DataTextField = "Reg";lbxCars.DataValueField = "Reg";lbxCars.DataBind();如果您还想选择第一项，请使用该SelectedIndex属性。当然，请务必先检查您的汽车清单中是否有物品。if (cars.Any()){&nbsp; &nbsp; lbxCars.SelectedIndex = 0;}