小问题

Question

 private void button1_Click(object sender, EventArgs e)
        {
            //textBox1.Text = listView1.Items.ToString();
            
            string path = textBox1.Text;
            DirectoryInfo dirinfo = new DirectoryInfo(path);
            DirectoryInfo[] arrdirinfo;
            arrdirinfo = dirinfo.GetDirectories();
            listView1.Items.Clear();
            foreach (DirectoryInfo di in arrdirinfo)
            {
                ListViewItem liv = new ListViewItem(di.Name);
                if (Path.GetExtension(di.Name).ToString().ToUpper()=="RAR")
                {
                    liv.ImageIndex = 2;
                }
                else
                {
                    liv.ImageIndex = 3;
                }
                liv.SubItems.Add(di.LastWriteTime.ToString());
                
                listView1.Items.Add(liv);
            }
        }
问题1：为什么我注释的那行，textBox输出的是一段英文（好像是System.....什么什么的），而不是我选中的ITEMS的名字呢！
问题2：在if判定文件类型的时候怎么在测试的时候不行呢，完全没改变图标。。
求解答，谢谢！

Answer 1

listView1.Items.ToString是输出的Items类型
listView1.Items[0].Text才是内容Path.GetExtension返回值中包括 '.'，好好看帮助

Answer 2

public ListViewItemCollection Items { get; }Items返回类型可不是string 哦 
http://msdn.microsoft.com/zh-cn/library/system.windows.forms.listview.items(v=vs.80).aspx

Answer 3

  if (Path.GetExtension(di.Name).TrimStart('.').ToString().ToUpper()=="RAR")

Answer 4

如果我想得到选中的SelectedItems的名字应该怎么写呢，我写了textBox1.Text = listView1.SelectedItems[0].ToString();
输出是listview1：{e:\},括号里面的才是我想要的值，怎么多了点东西呢！
还有第二个问题，用了上面2位的方法还是不行，不知道什么问题，我给全部代码你看看
public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Text = "我的电脑";
            string[] arrDrives = Directory.GetLogicalDrives();
            foreach (string str in arrDrives)
            {
                ListViewItem liv = new ListViewItem(str, 0);
                listView1.Items.Add(liv);
                
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            
            textBox1.Text = listView1.SelectedItems[0].ToString();
            string path = textBox1.Text;
            DirectoryInfo dirinfo = new DirectoryInfo(path);
            DirectoryInfo[] arrdirinfo;
            arrdirinfo = dirinfo.GetDirectories();
            listView1.Items.Clear();
            foreach (DirectoryInfo di in arrdirinfo)
            {
                ListViewItem liv = new ListViewItem(di.Name);
                if (Path.GetExtension(di.Name).TrimStart('.').ToString().ToUpper() == "RAR")
                {
                    liv.ImageIndex = 2;
                }
                else
                {
                    liv.ImageIndex = 3;
                }
                liv.SubItems.Add(di.LastWriteTime.ToString());                listView1.Items.Add(liv);
            }
        }        private void 大图标ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.View = View.LargeIcon;
        }        private void 小图标ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.View = View.SmallIcon;
        }        private void 详细ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.View = View.Details;
        }        private void 列表ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.View = View.List;
        }    }
求帮忙！谢谢