private void 影片图库ToolStripMenuItem_Click(object sender, EventArgs e)
 {
     影片图库ToolStripMenuItem.Checked = !影片图库ToolStripMenuItem.Checked;
     if (影片图库ToolStripMenuItem.Checked)
     {
         form_MImgsList.Show(panel_DockPanel);
     }
     else
     {
         form_MImgsList.Hide();
     }
 }