大家好，我正在做一个小项目，我在文件而不是数据库中添加、删除和更新项目。我有一个列表视图和列表，我在 UI 中的列表视图中添加项目并在列表中添加对象。但是当我从列表视图中删除项目时，而不是列表中的对象并抛出异常。代码如下和行问题和问题的指示。
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 Address_Book_students
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
List<student> boy = new List<student>();
private void Form1_Load(object sender, EventArgs e)
{
String path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
if (!Directory.Exists(path + "\\Address_project_irfan"))
Directory.CreateDirectory((path + "\\Address_project_irfan"));
if (!File.Exists(path + "\\Address_project_irfan\\setting.xml"))
File.Create((path + "\\Address_project_irfan\\setting.xml"));
}
private void button2_Click(object sender, EventArgs e)
{
student b = new student();
b.Name = textBox1.Text;
b.Address = textBox2.Text;
b.Email = textBox3.Text;
b.Birthday = dateTimePicker1.Value;
b.Additional_info = textBox4.Text;
listView1.Items.Add(textBox1.Text);
boy.Add(b); // when i add the items in the listview1 at same time object is
// object is b is added to the lis boy
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
dateTimePicker1.Value = DateTime.Now;
textBox4.Text = "";
}
public void Remove()
{
listView1.Items.Remove(listView1.SelectedItems[0]);
boy.RemoveAt(listView1.SelectedItems[0].Index);//But when i remove items from
//the listview1 the items deleted
//from the listview but the object
// is not deleting from the list
//boy throwing the exception(Value of 0 is not
//a valid arguement) what the problems here with list?
}
private void button3_Click(object sender, EventArgs e)
{
Remove();
}
}
public class student
{
public string Name
{
get;
set;
}
public string Address
{
get;
set;
}
public string Email
{
get;
set;
}
public DateTime Birthday
{
get;
set;
}
public string Additional_info
{
get;
set;
}
}
}