private void btnDeleteCamera_Click(object sender, EventArgs e)
{
try {
Camera camera = cameras[lbCameras.SelectedIndex];
if (camera == curCamera)
{
MessageBox.Show("当前正在监控此摄像头，无法删除！");
return;
}
sqlite.deleteCamera(camera);
lbCameras.Items.RemoveAt(lbCameras.SelectedIndex);
cameras.Remove(camera);
} catch (System.Data.SQLite.SQLiteException ex) {
MessageBox.Show("删除失败！出现错误：\n" + ex.Message);
_log.Error(ex);
}
}