c# - 从列表中填充组合框

Question

新人在这里， 我目前正在处理一个带有组合框的表格，它将显示几个查理布朗电视特别节目，您可以单击以选择并查看描述、评级、运行时间等。我很接近但我不是在填充组合框方面，我希望得到一些帮助和指导。我看过其他人做过的几件事，但我的知识还不够丰富，无法从目前所看到的内容中推断出答案。

现在我也在尝试: 1. 从您的加载方法中获取列表 2.遍历它们 3. 访问我的组合框，用列表中的时间填充框。

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Globalization;//Used for Sting.ToUpperCase...
using System.Threading;

using System.Threading.Tasks;// Needed for Streaming...
using System.IO;// Needed for Streaming...


namespace a100___GUI___VideoStoreSelections
{
public partial class FormMovieLookUp : Form
{
    private const String FILE_NAME = "txt_movieDescriptions.txt";//connect to text file in debug

    private List<Listing> films { get; set; }

    public FormMovieLookUp()
    {
        InitializeComponent();
    }

    private void cmbMovieListingBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        txtTitleBox.Text = cmbMovieListingBox.SelectedItem.ToString();
    }

    //ToolBox -- my program specific tools
    public List<Listing> LoadListings()//load movie descriptions as list
    {
        StreamReader fileIn = new StreamReader(FILE_NAME);
        List<Listing> entries = new List<Listing>();

        //loop through every line of the file
        while (!fileIn.EndOfStream)
        {
            String line = fileIn.ReadLine();
            String[] pieces = line.Split(':');

            if (pieces.Length < 4) continue;//error handling - set to length of text items

            Listing myListing = new Listing(pieces[0], pieces[1], pieces[2], pieces[3]);
            entries.Add(myListing);
        }
        fileIn.Close();
        return entries;
    }

    private void FormMovieLookUp_Load_1(object sender, EventArgs e)
    {
        films = LoadListings();
        foreach (Listing film in films)
        {
            Console.WriteLine(film);
            cmbMovieListingBox.Items.Add(film.GetFilmTitle());
        }
    }
}
}

list .CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace a100___GUI___VideoStoreSelections
{

public class Listing
{
    private String filmTitle;
    private String description;
    private String filmRunTime;
    private String filmRating;

    public Listing(String filmTitle, String description, String filmRunTime, String filmRating)
    {
        this.filmTitle = filmTitle;
        this.description = description;
        this.filmRunTime = filmRunTime;
        this.filmRating = filmRating;
    }

    public String GetFilmTitle() { return filmTitle; }
    public String GetDescription() { return description; }
    public String GetFilmRunTime() { return filmRunTime; }
    public String GetFilmRating() { return filmRating; }



}

这就是我试图填充组合框的方法。谢天谢地收到任何帮助。

Answer 1

我会持有 List<Listing>在类级别，以便您可以在用户单击它时访问它。我也会把它放在它自己的线程上，而不是直接放在 Load 事件中。如果这是一个漫长的过程，您将挂起 ui。

private List<Listing> films { get; set; }

加载

films = LoadListings();
foreach (Listing film in films)
{
    cmbMovieListingBox.Items.Add(film.GetFilmTitle());
}

当用户选择项目时

Listing film = films.Where(f => f.GetFilmTitle().Equals(cmbMovieListingBox.SelectedValue)).FistOrDefault();

if (film != null)
{
    //do work
}