textbox支持拖拽路径/文件

public class TextBoxHelper
{
    public TextBoxHelper()
    {

    }

    public void RegisterFileSelect(TextBox txt_SelectFile, string Filter, bool Multiselect)
    {
        txt_SelectFile.AllowDrop = true;
        txt_SelectFile.DragEnter += (sender, e) =>
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Link;
                (sender as Control).Cursor = System.Windows.Forms.Cursors.Arrow;  //指定鼠标形状（更好看）  
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }
        };

        txt_SelectFile.DragDrop += (sender, e) =>
        {
            string path = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();
            (sender as TextBox).Text = path;
            (sender as TextBox).Cursor = System.Windows.Forms.Cursors.IBeam; //还原鼠标形状
        };

        txt_SelectFile.DoubleClick += (sender, e) =>
        {

            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Multiselect = Multiselect;
            if (!String.IsNullOrEmpty(Filter))
                openFileDialog.Filter = Filter;
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                (sender as TextBox).Text = openFileDialog.FileName;
            }
        };


    }


    /// <summary>
    /// 选择文件夹
    /// </summary>
    /// <param name="txt_RootPath"></param>
    /// <param name="IniConfig"></param>
    public void RegisterFolderSelect(TextBox txt_RootPath)
    {
        txt_RootPath.AllowDrop = true;
        txt_RootPath.DragEnter += (sender, e) =>
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Link;
                (sender as Control).Cursor = System.Windows.Forms.Cursors.Arrow;  //指定鼠标形状（更好看）  
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }
        };

        txt_RootPath.DragDrop += (sender, e) =>
        {
            string path = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();
            (sender as TextBox).Text = path;
            (sender as TextBox).Cursor = System.Windows.Forms.Cursors.IBeam; //还原鼠标形状
        };

        txt_RootPath.DoubleClick += (sender, e) =>
        {
            FolderBrowserDialog openFileDialog = new FolderBrowserDialog();
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                (sender as TextBox).Text = openFileDialog.SelectedPath;
            }
        };
    }
}