Question

我有一个带有显示内容的列表框的Windows窗体应用程序，我希望能够在单击按钮时上下移动列表框中的项目。此时列表框中的项目存储在文本文件中，该文件在应用程序启动时加载到配置类中。如何上/下移动项目并更改文本文件中的顺序？

我的主要申请表格代码：

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.IO;

namespace company1
{
    public partial class Form1 : Form
    {
        List<Configuration> lines = new List<Configuration>();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.listBox1.Items.Clear();
            //Read in every line in the file
            using (StreamReader reader = new StreamReader("file.txt"))
            {
                string line = reader.ReadLine();
                while (line != null)
                {
                    string[] array = new string[] { "\\n" };
                    string[] parts = new string[3];
                    parts = line.Split(array, StringSplitOptions.RemoveEmptyEntries);
                    lines.Add(new Configuration(parts[0], int.Parse(parts[1]), int.Parse(parts[2])));
                    line = reader.ReadLine();
                }

            }
            listBox1.DataSource = lines;
            listBox1.DisplayMember = "CompanyName";
        }
    }
}

配置类文件

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

namespace company1
{
    class Configuration
    {
        string _CompanyName;
        int _Employees;
        int _Half;

        public Configuration(string companyname, int number_of_Employees, int half)
        {
            _CompanyName = companyname;
            _Employees = number_of_Employees;
            _Half = half;
        }

        //program properties and validation
        public string CompanyName
        {
            set
            {
                _CompanyName = value;
            }
            get
            {
                return _CompanyName;
            }
        }// End of levelname validation

        //program properties and validation
        public int EmployeesNumber
        {
            set
            {
                _Employees = value;
            }
            get
            {
                return _Employees;
            }
        }// End of levelname validation

        //program properties and validation
        public int Half
        {
            set
            {
                _Half = value;
            }
            get
            {
                return _Half;
            }
        }// End of levelname validation
    }


}

任何帮助表示赞赏，已经尝试了几天才能让它发挥作用。

Answer 1

// change the items in source list
var tmpLine = lines[10];
lines[10] = lines[9];
lines[9] = tmpLine;

// refresh datasource of listbox
listBox1.DataSource = null;
listBox1.DataSource = lines;

Answer 2

您可以为列表定义扩展方法，以便根据索引移动项目：

public static class ExtensionClass
{
    public static void Move<T>(this List<T> list, int index1, bool moveDown = true)
    {
        if (moveDown)
        {
            T temp = list[index1];
            list[index1] = list[index1 + 1];
            list[index1 + 1] = temp;
        }
        else
        {
            T temp = list[index1];
            list[index1] = list[index1 - 1];
            list[index1 - 1] = temp;

        }
    }
}

然后在Code中你可以：

List<int> list = new List<int> { 1, 2, 3, 4, 5, 6, 7 };
            Console.WriteLine("Original List");
            foreach (int i in list)
            {
                Console.Write(i + ",");
            }
            Console.WriteLine(Environment.NewLine + "Move Index 2 Down");
            list.Move(2);
            foreach (int i in list)
            {
                Console.Write(i + ",");
            }
            Console.WriteLine(Environment.NewLine + "Move Index 3 Up");
            list.Move(3, false);
            foreach (int i in list)
            {
                Console.Write(i + ",");
            }

输出将是：

Original List
1,2,3,4,5,6,7,
Move Index 2 Down
1,2,4,3,5,6,7,
Move Index 3 Up
1,2,3,4,5,6,7,

c＃上下移动列表框中的项目

2 个答案: