OpenFileDialog 和 FolderBrowserDialog

OpenFileDialog 和 FolderBrowserDialog：
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【 FolderBrowserDialog 的使用】: 提示用户选择文件夹；
    //设置根在桌面
    folderBrowserDialog1.RootFolder = SpecialFolder.Desktop;

    //设置当前选择的路径
    folderBrowserDialog1.SelectedPath = "C:";

    //允许在对话框中包括一个新建目录的按钮
    folderBrowserDialog1.ShowNewFolderButton = true;

    //设置对话框的说明信息
    folderBrowserDialog1.Description = "请选择输出目录";

    //默认路径是程序所在目录的Data文件夹
    folderBrowserDialog1.SelectedPath = System.Environment.CurrentDirectory.ToString() + @"/Data";

    //弹出框用于选择路径，完成后校验路径是否正确
    if(folderBrowser.Dialog1.ShowDialog() == DialogResult.OK)
    {
        //获取选择的路径
        String szSelectedPath = folderBrowserDialog1.SelectedPath;
    }

    例：
        //点击浏览按钮后，填出框用于选择路径
        private void ButtonScanClick(object sender, EventArgs e)
        {
            FolderBrowserDialog fbd = new FolderBrowserDialog ();
            fbd.Description = "选择文件夹";
            fbd.RootFolder = Environment.SpecialFolder.MyComputer;
            fbd.ShowNewFolderButton = true;
            if(fbd.ShowDialog() != DialogResult.OK)
                return;

            string path=fbd.SelectedPath;
            textBox1.Text=path;
        }
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【 OpenFileDialog 的使用】: 提示用户打开文件，使用此类可检查某个文件是否存在并打开该文件；
    例：
    private void Button1Click(object sender, EventArgs e)
    {
        //类的实例化
        OpenFileDialog openFileDialog1 = new OpenFileDialog();

        //打开位置
        openFileDialog1.InitialDirectory =Environment.GetFolderPath(Environment.SpecialFolder.MyComputer);

        //文件类型
        openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";

        //表示默认筛选情况
        openFileDialog1.FilterIndex = 1;

        //获取或设置一个值，该值指示对话框在关闭前是否还原当前目录。
        openFileDialog1.RestoreDirectory = true;

        //文件有效性验证ValidateNames，验证用户输入是否是一个有效的Windows文件名
        openFileDialog1.ValidateNames = true;

        //验证路径有效性
        openFileDialog1.CheckFileExists = true;

        //验证文件有效性
        openFileDialog1.CheckPathExists = true;

        //弹出框用于选择路径，完成后校验路径是否正确
        if (openFileDialog1.ShowDialog() != DialogResult.OK)
            return;

        string path=openFileDialog1.SafeFileName;
        this.textBox1.AppendText(path);
    }
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