C# 如何允许用户更改列表框顺序

我正在寻求帮助，我有两个列表，都将数据添加到同一个列表框中，并将它们显示为摘要，我想知道如何让用户在列表框中上下移动索引

在此处添加项目

   private void BtnAddpickup_Click(object sender, EventArgs e)
    {
           /*
            * This method creates a new pickup object, allows the user to
            * enter details and adds it to the List
            *  
            */

        Pickupform.pickup = new Pickups();
        //New Visit- note added to the pickupform object

        Pickupform.ShowDialog();
        //Show the pickupForm. ShowDialog ensures that the form has the exclusive focus    until it is closed.

        if (Pickupform.pickup != null)
        //if null then the "cancel" button was pressed
        {
            Pickups newpic = Pickupform.pickup;
            //Get the Pickup object from the form

            thePickup.addPickups(newpic);
            //Add the visit to the list
        }
        updateList();
        //Update the list object to reflect the Pickups in the list
    }

还有这个

 public Pickups getPickups(int index)
    {
        //Return the pickup object at the <index> place in the list

        int count = 0;
        foreach (Pickups pic in pickups)
        {
            //Go through all the pickup objects
            if (index == count)
                //If we're at the correct point in the list...
                return pic;
            //exit this method and return the current visit
            count++;
            //Keep counting
        }
        return null;
        //Return null if an index was entered that could not be found
    }

public Pickups getPickups（int索引）
{
//在列表中的位置返回拾取对象
整数计数=0；
foreach（皮卡中的皮卡图片）
{
//检查所有拾取对象
如果（索引==计数）
//如果我们在列表中的正确位置。。。
返回pic；
//退出此方法并返回当前访问
计数++；
//数一数
}
返回null；
//如果输入了找不到的索引，则返回null
}

---

这对我的另一门课也是一样的，因此如果您能提供任何帮助，我们将不胜感激。

您可以尝试类似的方法。下面的代码假定Windows窗体包含名为mainListBox的列表框、名为upButton的按钮和名为downButton的按钮

public partial class Form1 : Form
{
    private class Person
    {
        public string LastName { get; set; }

        public string FirstName { get; set; }

        public override string ToString()
        {
            return string.Format("{0}, {1}", LastName, FirstName);
        }
    }

    public Form1()
    {
        this.InitializeComponent();

        this.mainListBox.SelectionMode = SelectionMode.One;

        this.PopulateListBox();
    }

    private void PopulateListBox()
    {
        this.mainListBox.Items.Add(new Person() { FirstName = "Joe", LastName = "Smith" });
        this.mainListBox.Items.Add(new Person() { FirstName = "Sally", LastName = "Jones" });
        this.mainListBox.Items.Add(new Person() { FirstName = "Billy", LastName = "Anderson" });
    }

    private void upButton_Click(object sender, EventArgs e)
    {
        if (this.mainListBox.SelectedIndex > 0)
        {
            int selectedIndex = this.mainListBox.SelectedIndex;
            object selectedItem = this.mainListBox.SelectedItem;

            this.mainListBox.Items.RemoveAt(selectedIndex);
            this.mainListBox.Items.Insert(selectedIndex - 1, selectedItem);

            this.mainListBox.SelectedIndex = selectedIndex - 1;
        }
    }

    private void downButton_Click(object sender, EventArgs e)
    {
        if (this.mainListBox.SelectedIndex > -1 &&
            this.mainListBox.SelectedIndex < this.mainListBox.Items.Count - 1)
        {
            int selectedIndex = this.mainListBox.SelectedIndex;
            object selectedItem = this.mainListBox.SelectedItem;

            this.mainListBox.Items.RemoveAt(selectedIndex);
            this.mainListBox.Items.Insert(selectedIndex + 1, selectedItem);

            this.mainListBox.SelectedIndex = selectedIndex + 1;
        }
    }
}

公共部分类表单1:表单
{
私人阶级人士
{
公共字符串LastName{get；set；}
公共字符串名{get；set；}
公共重写字符串ToString（）
{
返回string.Format（“{0}，{1}”，LastName，FirstName）；
}
}
公共表格1（）
{
this.InitializeComponent（）；
this.mainListBox.SelectionMode=SelectionMode.One；
this.PopulateListBox（）；
}
私有void PopulateListBox（）
{
this.mainListBox.Items.Add（newperson（）{FirstName=“Joe”，LastName=“Smith”}）；
这个.mainListBox.Items.Add（newperson（）{FirstName=“Sally”，LastName=“Jones”}）；
这个.mainListBox.Items.Add（newperson（）{FirstName=“Billy”，LastName=“Anderson”}）；
}
私有无效向上按钮单击（对象发送方，事件参数e）
{
如果（this.mainListBox.SelectedIndex>0）
{
int selectedIndex=this.mainListBox.selectedIndex；
object selectedItem=this.mainListBox.selectedItem；
this.mainListBox.Items.RemoveAt（selectedIndex）；
this.mainListBox.Items.Insert（selectedIndex-1，selectedItem）；
this.mainListBox.SelectedIndex=SelectedIndex-1；
}
}
private void downButton\u单击（对象发送者，事件参数e）
{
如果（this.mainListBox.SelectedIndex>-1&&
this.mainListBox.SelectedIndex

仅当使用ObjectCollection.Add方法将项添加到列表框时，此操作才有效。如果是数据绑定，则可以更新实际数据源并使用ListBox的BindingContext进行刷新

private List<Person> people = new List<Person>();

private void PopulateListBox()
{
    this.people.Add(new Person() { FirstName = "Joe", LastName = "Smith" });
    this.people.Add(new Person() { FirstName = "Sally", LastName = "Jones" });
    this.people.Add(new Person() { FirstName = "Billy", LastName = "Anderson" });

    this.mainListBox.DataSource = people;
}

private void upButton_Click(object sender, EventArgs e)
{
    if (this.mainListBox.SelectedIndex > 0)
    {
        int selectedIndex = this.mainListBox.SelectedIndex;
        Person selectedItem = this.mainListBox.SelectedItem as Person;

        this.people.RemoveAt(selectedIndex);
        this.people.Insert(selectedIndex - 1, selectedItem);

        this.mainListBox.SelectedIndex = selectedIndex - 1;

        this.RefreshListSource();
    }
}

private void RefreshListSource()
{
    CurrencyManager boundList = this.mainListBox.BindingContext[this.people] as CurrencyManager;
    boundList.Refresh();
}

private List people=new List（）；
私有void PopulateListBox（）
{
this.people.Add（newperson（）{FirstName=“Joe”，LastName=“Smith”}）；
this.people.Add（newperson（）{FirstName=“Sally”，LastName=“Jones”}）；
this.people.Add（newperson（）{FirstName=“Billy”，LastName=“Anderson”}）；
this.mainListBox.DataSource=人；
}
私有无效向上按钮单击（对象发送方，事件参数e）
{
如果（this.mainListBox.SelectedIndex>0）
{
int selectedIndex=this.mainListBox.selectedIndex；
Person-selectedItem=this.mainListBox.selectedItem为Person；
this.people.RemoveAt（selectedIndex）；
this.people.Insert（selectedIndex-1，selectedItem）；
this.mainListBox.SelectedIndex=SelectedIndex-1；
此参数为.RefreshListSource（）；
}
}
私有void RefreshListSource（）
{
CurrencyManager boundList=this.mainListBox.BindingContext[this.people]作为CurrencyManager；
刷新（）；
}

您可以尝试这样的方法。下面的代码假定Windows窗体包含名为mainListBox的列表框、名为upButton的按钮和名为downButton的按钮

public partial class Form1 : Form
{
    private class Person
    {
        public string LastName { get; set; }

        public string FirstName { get; set; }

        public override string ToString()
        {
            return string.Format("{0}, {1}", LastName, FirstName);
        }
    }

    public Form1()
    {
        this.InitializeComponent();

        this.mainListBox.SelectionMode = SelectionMode.One;

        this.PopulateListBox();
    }

    private void PopulateListBox()
    {
        this.mainListBox.Items.Add(new Person() { FirstName = "Joe", LastName = "Smith" });
        this.mainListBox.Items.Add(new Person() { FirstName = "Sally", LastName = "Jones" });
        this.mainListBox.Items.Add(new Person() { FirstName = "Billy", LastName = "Anderson" });
    }

    private void upButton_Click(object sender, EventArgs e)
    {
        if (this.mainListBox.SelectedIndex > 0)
        {
            int selectedIndex = this.mainListBox.SelectedIndex;
            object selectedItem = this.mainListBox.SelectedItem;

            this.mainListBox.Items.RemoveAt(selectedIndex);
            this.mainListBox.Items.Insert(selectedIndex - 1, selectedItem);

            this.mainListBox.SelectedIndex = selectedIndex - 1;
        }
    }

    private void downButton_Click(object sender, EventArgs e)
    {
        if (this.mainListBox.SelectedIndex > -1 &&
            this.mainListBox.SelectedIndex < this.mainListBox.Items.Count - 1)
        {
            int selectedIndex = this.mainListBox.SelectedIndex;
            object selectedItem = this.mainListBox.SelectedItem;

            this.mainListBox.Items.RemoveAt(selectedIndex);
            this.mainListBox.Items.Insert(selectedIndex + 1, selectedItem);

            this.mainListBox.SelectedIndex = selectedIndex + 1;
        }
    }
}

公共部分类表单1:表单
{
私人阶级人士
{
公共字符串LastName{get；set；}
公共字符串名{get；set；}
公共重写字符串ToString（）
{
返回string.Format（“{0}，{1}”，LastName，FirstName）；
}
}
公共表格1（）
{
this.InitializeComponent（）；
this.mainListBox.SelectionMode=SelectionMode.One；
this.PopulateListBox（）；
}
私有void PopulateListBox（）
{
this.mainListBox.Items.Add（newperson（）{FirstName=“Joe”，LastName=“Smith”}）；
这个.mainListBox.Items.Add（newperson（）{FirstName=“Sally”，LastName=“Jones”}）；
这个.mainListBox.Items.Add（newperson（）{FirstName=“Billy”，LastName=“Anderson”}）；
}
私有无效向上按钮单击（对象发送方，事件参数e）
{
如果（this.mainListBox.SelectedIndex>0）
{
int selectedIndex=this.mainListBox.selectedIndex；
object selectedItem=this.mainListBox.selectedItem；
this.mainListBox.Items.RemoveAt（selectedIndex）；
this.mainListBox.Items.Insert（selectedIndex-1，selectedItem）；
this.mainListBox.SelectedIndex=SelectedIndex-1；
}
}
private void downButton\u单击（对象发送者，事件参数e）
{
如果（this.mainListBox.SelectedIndex>-1&&
this.mainListBox.SelectedIndex