ListView 正在显示未存储在数据库中的数据

Question

我的程序用他们选择的别名显示球员分数，问题是我有大量的测试运行存储在数据库中，所以我删除了表的所有条目，但它们仍然显示在列表视图中？

任何帮助将不胜感激。

public partial class Leaderboard : Form
{

    public Leaderboard()
    {
        InitializeComponent();
    }

SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=F:\Graded\WindowsFormsApplication2\WindowsFormsApplication2\bin\Debug\SusData.mdf;Integrated Security=True;Connect Timeout=30");

    private void Leaderboard_Shown(object sender, EventArgs e)
    {
        //try catch for opening the connection to the database
        try
        {
           con.Open();//Opening the connection to the database
        }
        catch (SqlException ex)
        {
            MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
            Application.ExitThread();//if the database can't be opened the application will exit
        }
    }



    private void button1_Click(object sender, EventArgs e)
    {

        SqlCommand cm = new SqlCommand("SELECT Alias, Score FROM HighScore ORDER BY SCORE ASC");//SqlCommand allows for SQl commands to be used in the code of c#
        try//try catch for loading the users highScores
        {

            SqlDataReader DR = cm.ExecuteReader();
            while (DR.Read())
            {
                ListViewItem item = new ListViewItem(DR["Score"].ToString());//Filling the list view with users Scores
                item.SubItems.Add(DR["Alias"].ToString());//Filling the list view with users Alias
                listView1.Items.Add(item);//Adding everything

            }

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);//Messagebox in case theres an error loading the scores to the ListView

        }
    }

我在数据库中有两个表，玩家的分数和别名存储在 HighScore 表中。

Answer 1

您应该在 SqlCommand 代码周围显式使用 SqlConnection（在 using 块中）。不确定您在执行查询时针对的是哪个连接。