列表无法清除 C#

Question

//selects the movie option, this will populate the movie lists (titles only)
    private void btnMovies_Click(object sender, EventArgs e)
    {
        int size = 0;
        string titles = null;
        byte[] dataSend = new byte[1024];
        byte[] dataReceive = new byte[1024];
        string[] split = null;
        movieList.Items.Clear();
        movietitles.Clear();
        try
        {

            Array.Clear(dataSend, 0, dataSend.Length);
            dataSend = Encoding.ASCII.GetBytes("movies");
            socket.Send(dataSend);
            size = socket.Receive(dataReceive);//receive movie titles
            titles = Encoding.ASCII.GetString(dataReceive, 0, size);
            char[] separators = { ';' };
            split = titles.Split(separators);

            for (int i =0;i<split.Count();i++)
            {
                movietitles.Add(split[i]);
            }

            foreach (string smovie in movietitles)
            {
                movieList.Items.Add(smovie);
            }


        }
        catch (SocketException ex)
        {
            lblError.Text = "Unable to connect to server";
            lblError.Text += ex;
        }

        pnlMovies.Visible = true;


    }

所以，这里发生的事情是，我填充movieList（listbox）与movietitles列表中的电影标题。然而，每次我再次按下movies按钮，它都会再次填充，而不清除之前的一个，即使我清除了它。我打印出movietitles的.count，每次都增加一倍，所以肯定是问题。

我已经用.Clear()清除了它，所以不知道还能做什么。我也重置了所有的变量，但是没有任何效果。谢谢

Answer 1

我认为，如果你把ListBox绑定到一个数据源上可能会更好。 就像这样。

//populate your List with your movie titles
private List<String> movieTitles = new List<string>() { "movie1", "movie2", "movie3" };
//Then bind the datasource
movieList.ItemSource = movieTitles;