4.第二章.上机1-3
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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication2{ public partial class MySchool : Form { public MySchool() { InitializeComponent(); } private void 退出ToolStripMenuItem_Click(object sender, EventArgs e) { MySchool_管理员 x = new MySchool_管理员(); x.Show(); } }}
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication2{ public partial class MySchool_管理员 : Form { public MySchool_管理员() { InitializeComponent(); } private void MySchool_管理员_Load(object sender, EventArgs e) { } private void 编辑学生信息ToolStripMenuItem_Click(object sender, EventArgs e) {MySchool_编辑学生信息 z = new MySchool_编辑学生信息(); z.MdiParent = this; z.Show(); } }}
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.Data.SqlClient;namespace WindowsFormsApplication2{ public partial class MySchool_编辑学生信息 : Form { public MySchool_编辑学生信息() { InitializeComponent(); } public bool BG() { DBHelper awe = new DBHelper(); try { string sql = "SELECT * FROM [Grade]"; awe.OpenConnection(); SqlCommand command = new SqlCommand(sql, awe.Connection); SqlDataReader myReader = command.ExecuteReader(); while (myReader.Read()) { string gradeName = myReader["GradeName"].ToString(); comboBox1.Items.Add(gradeName); } myReader.Close(); return true; } catch (Exception) { MessageBox.Show("系统发生错误", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); return false; } finally { awe.CloseConnection(); } } private void MySchool_编辑学生信息_Load(object sender, EventArgs e) { BG(); }
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