private void professionTreeView_AfterSelect(object sender, TreeViewEventArgs e) { TreeNode pnode = professionTreeView.SelectedNode; if (pnode.Text != "专业") { dataGridView1.DataSource = StudentInfoBLL.GetStudentInfoListByProfession(pnode.Text); } else { dataGridView1.DataSource = StudentInfoBLL.GetAllStudentInfo(); } }