C# 选定行更改时，DataGrid获取索引-1没有值

我有一个简单的datagrid，它显示一些列表变量的内容。我有两个与之相关的按钮，一个用于向列表变量添加内容并刷新datagrid，另一个用于删除它并同时刷新

我可以毫无问题地添加对象，但是，如果我更改所选行，我会得到一个错误，说Index-1没有值。不知道为什么

设置datagrid的代码如下所示：

allTravellersDataGrid.DataSource = allTravellers;

private void addAttendee_Click(object sender, EventArgs e)
    {
        if (attendeeName.Text == "" || attendeeSurname.Text == "" || attendeeBirthDate.Text == "" || attendeeIdNumber.Text == "")
        { MessageBox.Show("Not all information regarding the attendee entered"); }
        else
        {
            allTravellers.Add(dt.prepareTraveller(attendeeName.Text, attendeeSurname.Text, attendeeBirthDate.Text, attendeeIdNumber.Text));
            allTravellersDataGrid.DataSource = null;
            allTravellersDataGrid.DataSource = allTravellers;
            allTravellersDataGrid.Refresh();
        }
    }

我上面提到的列表是AllTravelers在哪里

将内容添加到AllTravelers列表的按钮如下所示：

allTravellersDataGrid.DataSource = allTravellers;

private void addAttendee_Click(object sender, EventArgs e)
    {
        if (attendeeName.Text == "" || attendeeSurname.Text == "" || attendeeBirthDate.Text == "" || attendeeIdNumber.Text == "")
        { MessageBox.Show("Not all information regarding the attendee entered"); }
        else
        {
            allTravellers.Add(dt.prepareTraveller(attendeeName.Text, attendeeSurname.Text, attendeeBirthDate.Text, attendeeIdNumber.Text));
            allTravellersDataGrid.DataSource = null;
            allTravellersDataGrid.DataSource = allTravellers;
            allTravellersDataGrid.Refresh();
        }
    }

最后，用于从列表中删除对象的按钮的代码如下所示：

private void removeAttendee_Click(object sender, EventArgs e)
    {
        traveller travellerToRemove = (traveller)allTravellersDataGrid.CurrentRow.DataBoundItem;
        allTravellers.Remove(travellerToRemove);
        allTravellersDataGrid.Refresh();
    }

这里有没有人能像我一样无助地找出导致索引问题的原因

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谢谢。

我怀疑当您收到此错误时，您当前未在所选项目上。未选定项的列表控件用“-1”表示该项。在尝试删除某个有效项之前检查它可能会解决您的问题

我还使用了BindingList，不确定它对您有什么影响

采用带有 名为AttendeName的文本框 添加名为addBtn的按钮 删除名为removeBtn的按钮 名为allTravellersDataGrid的网格

这项工作：

using System;
using System.ComponentModel;
using System.Windows.Forms;
using StackOverFlowWinForms.Model;

namespace StackOverFlowWinForms
{
public partial class Form1 : Form
{
    private BindingList<Traveller> _allTravellers = new BindingList<Traveller>();
    public BindingList<Traveller> allTravellers { get { return _allTravellers; } }

    public Form1()
    {
        InitializeComponent();

        allTravellers.Add(new Traveller("Fred"));
        allTravellers.Add(new Traveller("George"));
        allTravellers.Add(new Traveller("Sam"));
        allTravellers.Add(new Traveller("Mary"));

        this.allTravellersDataGrid.DataSource = allTravellers;

    }

    private void addBtn_Click(object sender, EventArgs e)
    {
        if (attendeeName.Text == "")
        { MessageBox.Show("Not all information regarding the attendee entered"); }
        else
        {
            allTravellers.Add(new Traveller(attendeeName.Text));
        }

    }

    private void removeBtn_Click(object sender, EventArgs e)
    {
        if (allTravellersDataGrid.CurrentRow != null) 
        {
            Traveller travellerToRemove = (Traveller)allTravellersDataGrid.CurrentRow.DataBoundItem;
            allTravellers.Remove(travellerToRemove);

        }

    }
}
}

using System;
using System.ComponentModel;

namespace StackOverFlowWinForms.Model
{
public class Traveller 

{

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }

    #endregion 

    private string _attendeeName;
    public string attendeeName 
    { 
        get 
        {
            return _attendeeName; 
        } 
        set 
        {
            _attendeeName = value; 
            NotifyPropertyChanged("attendeeName"); 
        } 
    }


    public Traveller()
    {
        this.attendeeName = "Unknown";
    }
    public Traveller(string name)
    {
        this.attendeeName = name;
    }
}
}

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在网格上是否有索引更改事件？如果是，请张贴代码。