private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { StudentInfo studentInfo = new StudentInfo(); if (treeView1.SelectedNode.Text == "计算机科学与技术") { studentInfo.Profession = "计算机科学与技术"; dataGridView1.DataSource = StudentInfoBLL.GetStudentInfoList(studentInfo); } else if (treeView1.SelectedNode.Text == "电子信息科学与技术") { studentInfo.Profession = "电子信息科学与技术"; dataGridView1.DataSource = StudentInfoBLL.GetStudentInfoList(studentInfo); } else if (treeView1.SelectedNode.Text == "信息安全") { studentInfo.Profession = "信息安全"; dataGridView1.DataSource = StudentInfoBLL.GetStudentInfoList(studentInfo); } else { dataGridView1.DataSource = StudentInfoBLL.GetAllStudentInfo(); } }