/// <summary>
/// 用户执行下载功能
/// </summary>
public static void Download(FileTreeNode file)
{
SaveFileDialog dia = new SaveFileDialog();
dia.Filter = "*.*|*.*";
DialogResult dr = dia.ShowDialog();
if (dr == DialogResult.OK)
{
BLLControl.DownloadFile(dia.FileName, file);
}
}