程序代码：

 private void From1_Load(object sender, EventArgs e)
        {
            //获取PhotoPath
            string path = @"Files\pic\";
            var allFilesPath = Directory.GetFiles(path);
            //显示在listbox1中
            listBox1.DataSource= allFilesPath;
        }

 private void btnImport_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.Filter = "JPG文件(*jpg)|(*.jpg)|JPEG文件(*.jpeg)|(*.jpeg)|BMP文件(*.bmp)|(*.bmp)|图标(*.ico)|(*.ico)";
        }