初学者 ！为什么显示两次图片

菜鸟求救 ！为什么显示两次图片

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices; 
namespace QianMingForm
{
    public partial class Photo : Form
    {
        private List<string> tifNames = new List<string>();
        private int index;  
        public Photo()
        {
            InitializeComponent();
        }   
        private void Photo_Shown(object sender, EventArgs e)
        {          
            this.FormBorderStyle = FormBorderStyle.None;
            string filename = string.Format(@"{0}\Data\", Environment.CurrentDirectory);
            DirectoryInfo TheFolder = new DirectoryInfo(filename);//文件路径                    
            for (int i = 0; i < TheFolder.GetFiles().Length; i++)//遍历文件夹
            {
                if (TheFolder.GetFiles()[i].Length > 0 && TheFolder.GetFiles()[i].Extension == ".png")//或者jpg,png 文件大小要大于0且是图片文件
                {
                    Image image = Image.FromFile(TheFolder.GetFiles()[i].DirectoryName + "\\" + TheFolder.GetFiles()[i].Name);    //获取文件                
                    tifNames.Add(TheFolder.GetFiles()[i].Name);//添加文件名
                    imageList2.Images.Add(image);//添加图片
                }
            }
            //初始化设置
            this.listView1.View = View.LargeIcon;
            this.listView1.LargeImageList = this.imageList2;
            //开始绑定
            this.listView1.BeginUpdate();
            for (int i = 0; i < tifNames.Count; i++)
            {
                 ListViewItem lvi = new ListViewItem();
                 lvi.ImageIndex = i;
                 //lvi.Text = tifNames[i];//显示文件名
                 this.listView1.Items.Add(lvi);             
            }
            this.listView1.EndUpdate();
        }   
        private void but_close_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
      
            string filename = string.Format(@"{0}\Data\", Environment.CurrentDirectory);
            if (this.listView1.SelectedItems.Count == 0)
            return;
            index = this.listView1.SelectedItems[0].Index;
            //MessageBox.Show(tifNames[index]);  
            this.pictureBox1.Image = Image.FromFile(filename + "\\" + tifNames[index]);  
          
        }      
    }
}

文件夹里只有3张图片，怎么显示出来两次
------解决思路----------------------
 加断点    调试  看  tifNames.Count 是多少，不对就是那个地方的判断条件有问题 了。
------解决思路----------------------

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices; 
namespace QianMingForm
{
    public partial class Photo : Form
    {
        private List<string> tifNames = new List<string>();
        private int index;  
        public Photo()
        {
            InitializeComponent();
        }   
        private void Photo_Shown(object sender, EventArgs e)
        {          
            this.FormBorderStyle = FormBorderStyle.None;
            string filename = string.Format(@"{0}\Data\", Environment.CurrentDirectory);
            DirectoryInfo TheFolder = new DirectoryInfo(filename);//文件路径                    
            for (int i = 0; i < TheFolder.GetFiles().Length; i++)//遍历文件夹
            {
                if (TheFolder.GetFiles()[i].Length > 0 && TheFolder.GetFiles()[i].Extension == ".png")//或者jpg,png 文件大小要大于0且是图片文件
                {
                    Image image = Image.FromFile(TheFolder.GetFiles()[i].DirectoryName + "\\" + TheFolder.GetFiles()[i].Name);    //获取文件                
                    tifNames.Add(TheFolder.GetFiles()[i].Name);//添加文件名
                    imageList2.Images.Add(image);//添加图片
                }
            }
            //初始化设置
Console.WriteLine(listView1.items.count);
            this.listView1.View = View.LargeIcon;
            this.listView1.LargeImageList = this.imageList2; 已经加载了
Console.WriteLine(listView1.items.count);
            //开始绑定
            this.listView1.BeginUpdate();
            for (int i = 0; i < tifNames.Count; i++)
            {
                 ListViewItem lvi = new ListViewItem();
                 lvi.ImageIndex = i;
                 //lvi.Text = tifNames[i];//显示文件名
Console.WriteLine(listView1.items.count);
                 this.listView1.Items.Add(lvi);            又加载一次 
Console.WriteLine(listView1.items.count);
            }
            this.listView1.EndUpdate();
        }   
        private void but_close_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
      
            string filename = string.Format(@"{0}\Data\", Environment.CurrentDirectory);
            if (this.listView1.SelectedItems.Count == 0)
            return;
            index = this.listView1.SelectedItems[0].Index;
            //MessageBox.Show(tifNames[index]);  
            this.pictureBox1.Image = Image.FromFile(filename + "\\" + tifNames[index]);  
          
        }      
    }
}

添加些打试试，家里电脑没有装vs，测试不了，你自己也加些打印试试