BackTerminal.frmCatMan.TreeViewSelected C# (CSharp) Méthode

        private bool TreeViewSelected()
        {
            if (tvCategory.SelectedNode == null)
            {
                MessageBox.Show("请选择一个分类！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Hand);
                return false;
            }
            return true;
        }