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1.FrmLogin窗体(登陆窗体)
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; //引入命名空间 using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace MySchool { public partial class FrmLogin : Form { public FrmLogin() { InitializeComponent(); } private void btnLogin_Click(object sender, EventArgs e) { //验证用户名和密码是否匹配 //准备连接字符串 string str = "data source=.;initial catalog=Myschool;uid=sa;pwd="; //准备连接对象 SqlConnection con = new SqlConnection(str); //准备发送的SQL语句 string sql = "select count(1) from Student where studentName='"+txtUserName.Text+"' and loginPwd='"+txtPwd.Text+"'"; //准备命令对象 SqlCommand cmd = new SqlCommand(sql,con); //try catch 捕获异常处理 try { con.Open(); //执行命令 int count = Convert.ToInt32(cmd.ExecuteScalar()); if (count > 0) { //登陆成功 进入管理员界面 this.Hide(); FrmAdmin frm = new FrmAdmin(); //在主窗体呈现在用户肉眼之前 悄悄改变用户名文本框中的值 frm.name = txtUserName.Text; frm.Show(); //Tool是自定义的一个工具类 Tool.pwd = txtPwd.Text; Tool.stuname = txtUserName.Text; } else { MessageBox.Show("登录失败!"); } } catch (Exception) { MessageBox.Show("连接失败!"); } finally { con.Close(); } } //Load里面的代码在被用户看到之前就已经被执行了 private void FrmLogin_Load(object sender, EventArgs e) { txtUserName.Text = "张玲"; txtPwd.Text = "000001"; } private void txtUserName_TextChanged(object sender, EventArgs e) { } private void txtPwd_TextChanged(object sender, EventArgs e) { } } }
2.登陆后进入的管理员主窗体(FrmAdmin)
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 MySchool { public partial class FrmAdmin : Form { public FrmAdmin() { InitializeComponent(); } //定义一个公有变量保存登陆的用户名 public string name; private void FrmAdmin_Load(object sender, EventArgs e) { //在顶部显示欢迎用户文字 this.Text = this.Text + " 欢迎您"+name; } private void FrmAdmin_FormClosing(object sender, FormClosingEventArgs e) { //点击关闭 关闭整个程序进程 Application.Exit(); } private void toolStripDropDownButton1_Click(object sender, EventArgs e) { // 为AddStudent窗体设置MDI FrmAddStudemt frm = new FrmAddStudemt(); frm.MdiParent = this; frm.Show(); } private void 编辑学生信息ToolStripMenuItem_Click(object sender, EventArgs e) { } private void 按姓名模糊查询ToolStripMenuItem_Click(object sender, EventArgs e) { //为姓名模糊查询设置MDI FrmSearchByStuName frm = new FrmSearchByStuName(); frm.MdiParent = this; frm.Show(); } private void tsmiselectinfoByAge_Click(object sender, EventArgs e) { //为根据学生年龄查询出符合的学生信息 FrmSelectByAge frm = new FrmSelectByAge(); frm.MdiParent = this; frm.Show(); } //点击新建学生信息按钮触发的事件 private void tsmiaddstu_Click(object sender, EventArgs e) { FrmAddStudemt frm = new FrmAddStudemt(); frm.MdiParent = this; frm.Show(); } //点击按学生姓名查询学生信息按钮触发的事件 private void tsmiSelectByName_Click(object sender, EventArgs e) { FrmSearchByStuName frm = new FrmSearchByStuName(); frm.MdiParent = this; frm.Show(); } private void tsmiHelp_Click(object sender, EventArgs e) { } private void 关于ToolStripMenuItem_Click(object sender, EventArgs e) { //为关于窗体设置MDI FrmChangePics frm = new FrmChangePics(); frm.MdiParent = this; frm.Show(); } private void tsmizhanghuguanli_Click(object sender, EventArgs e) { } private void tsmixiugaiPwd_Click(object sender, EventArgs e) { //为修改密码设置MDI FrmModifyPwd frm = new FrmModifyPwd(); frm.MdiParent = this; frm.Show(); } private void tsmiEditStuInfo_Click(object sender, EventArgs e) { } } }
3.新建用户窗体(FrmAddStudent窗体)
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 MySchool { public partial class FrmAddStudemt : Form { public FrmAddStudemt() { InitializeComponent(); } public int stuno; //加载所有年级信息 public void LoadGradeInfo() { //拿到所有年级的名称 string str = "data source=.;initial catalog=MySchool;uid=sa;pwd="; SqlConnection con = new SqlConnection(str); string sql = "select gradeName from grade"; SqlCommand cmd = new SqlCommand(sql, con); try { con.Open(); SqlDataReader dr = cmd.ExecuteReader(); if (dr != null) { if (dr.HasRows) { while (dr.Read()) { string name = dr["gradeName"].ToString(); //为年级赋初值 cbbStuGrade.Items.Add(name); } //循环结束关闭读取器 dr.Close(); } } } catch (Exception) { MessageBox.Show("连接失败!"); } finally { con.Close(); } } public int gradeid; //根据学号加载学生的其他信息(用于右键菜单时修改指定的学生基本信息) public void LoadInfoByStuNo() { string str = "data source=.;initial catalog=MySchool;uid=sa;pwd="; SqlConnection con = new SqlConnection(str); string sql = "select * from student where studentno="+stuno+""; SqlCommand cmd = new SqlCommand(sql, con); try { con.Open(); SqlDataReader dr = cmd.ExecuteReader(); if(dr!=null) { if(dr.HasRows) { while(dr.Read()) { string stuname=dr["studentname"].ToString(); txtStuName.Text = stuname; string stuaddress=dr["address"].ToString(); txtStuAddress.Text = stuaddress; string stuphone=dr["phone"].ToString(); txtStuPhone.Text = stuphone; string email=dr["Email"].ToString(); txtStuEmail.Text = email; gradeid = Convert.ToInt32(dr["gradeid"]); string gradename = GetNameByGradeId(); cbbStuGrade.Text = gradename; DateTime dt = Convert.ToDateTime(dr["birthday"]); dtpBirth.Value = dt; string sex = Convert.ToString(dr["gender"]); if(sex.Equals("0")) { rbFeMale.Checked = true; } else if(sex.Equals("1")) { rbMale.Checked = true; } } dr.Close(); } } } catch (Exception) { throw; } } //根据年级编号拿到年级名称 public string GetNameByGradeId() { string str = "data source=.;initial catalog=Myschool;uid=sa;pwd="; SqlConnection con = new SqlConnection(str); string sql = "select gradename from grade where gradeid=" + gradeid + ""; SqlCommand cmd = new SqlCommand(sql,con); string gradename=""; try { con.Open(); gradename = Convert.ToString(cmd.ExecuteScalar()); } catch (Exception) { MessageBox.Show("错误！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information); } finally { con.Close(); } return gradename; } private void FrmAddStudemt_Load(object sender, EventArgs e) { LoadGradeInfo(); //拿到选中的学生的学号 txtBStuNo.Text = stuno.ToString(); LoadInfoByStuNo(); } private void gbzhuce_Enter(object sender, EventArgs e) { } private void label5_Click(object sender, EventArgs e) { } private void txtBAginPwd_TextChanged(object sender, EventArgs e) { } private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { } private void txtBStuNo_TextChanged(object sender, EventArgs e) { } private void gbBaseInfo_Enter(object sender, EventArgs e) { } //添加学生信息 public void Addinfo() { //添加学生 string pwd; string pwdagin; pwd = txtBStuPwd.Text;//密码 pwdagin = txtBAginPwd.Text;//确认密码 string name = txtStuName.Text;//姓名 //获取性别 string sex = String.Empty; if (rbMale.Checked) { sex = "1"; } else { sex = "0"; } //根据所选的年级名称拿到相应的年纪编号 并提交到数据库 int gid = GetIdByName(); //获取电话 string phone = txtStuPhone.Text; //获取地址 string address = txtStuAddress.Text; //获取出生日期 DateTime birthday = dtpBirth.Value; //获取Email string email = txtStuEmail.Text; //将获取到的数据插入到数据库中 //StudentNo, LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email string str = "data source=.;initial catalog=MySchool;uid=sa;pwd="; SqlConnection con = new SqlConnection(str); string sql = @"insert into Student(LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email) values('" + pwd + "','" + name + "','" + sex + "'," + gid + ",'" + phone + "','" + address + "','" + birthday + "','" + email + "')"; SqlCommand cmd = new SqlCommand(sql, con); try { con.Open(); int count = Convert.ToInt32(cmd.ExecuteNonQuery()); if (count > 0) { MessageBox.Show("添加成功!"); } else { MessageBox.Show("添加失败!"); } } catch (Exception) { MessageBox.Show("网络异常!"); } finally { con.Close(); } } //点击保存按钮时执行相应的操作 private void btnSave_Click(object sender, EventArgs e) { //学号文本框为空字符串时执行添加操作 if (txtBStuNo == null) { Addinfo(); } //否则执行右键菜单的额修改操作 else { } } //该方法将年级名称转化成年级编号 private int GetIdByName() { string str = "data source=.;initial catalog=MySchool;uid=sa;pwd="; SqlConnection con = new SqlConnection(str); string sql = "select gradeid from grade where gradeName='" + cbbStuGrade .Text+ "'"; SqlCommand cmd = new SqlCommand(sql, con); int gid = 0; try { con.Open(); gid = Convert.ToInt32(cmd.ExecuteScalar()); } catch (Exception) { MessageBox.Show("网络异常!"); } finally { con.Close(); } return gid; } } }
4.根据学生姓名模糊查询学生信息
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace MySchool { public partial class FrmSearchByStuName : Form { public FrmSearchByStuName() { InitializeComponent(); } //加载所有DB数据到ListView 此方法接受相应按钮的SQL语句 public void LoadDataToListViewFromDB(string sql) { string str = "data source=.;initial catalog=MySchool;uid=sa;pwd="; SqlConnection con = new SqlConnection(str); SqlCommand cmd = new SqlCommand(sql, con); try { con.Open(); SqlDataReader dr = cmd.ExecuteReader(); if (dr != null) { if (dr.HasRows) { while (dr.Read()) { //形成变量 //每从DB中读取一条数据，需要形成一个ListView对象，代表的是ListView中的一行 int stuNo = Convert.ToInt32(dr["studentNO"]); string stuname = Convert.ToString(dr["studentName"]); string stusex = dr["gender"].ToString(); string gradename = dr["gradename"].ToString(); ListViewItem lvItem = new ListViewItem(stuNo.ToString()); lvItem.SubItems.Add(stuname); lvItem.SubItems.Add(stusex); lvItem.SubItems.Add(gradename); //让lvItem和ListView关联 lvList.Items.Add(lvItem); } dr.Close(); } } } catch (Exception) { MessageBox.Show("网络异常!"); } finally { con.Close(); } } //Load中的代码在窗体展现在用户肉眼之前应经被执行 即将所有学生信息打印出来 private void FrmSearchByStuName_Load(object sender, EventArgs e) { string sql = @"select studentno,studentname,gender,gradename from grade,student where grade.GradeId=Student.GradeId"; LoadDataToListViewFromDB(sql); } private void listView1_SelectedIndexChanged(object sender, EventArgs e) { } //点击查询按钮时触发的事件 private void btnSearch_Click(object sender, EventArgs e) { //查询数据前，清空ListView中的数据 lvList.Items.Clear(); string sql = @"select studentno,studentname,gender,gradename from student,grade where student.gradeid=grade.gradeid and studentname like '%"+txtName.Text+"%'"; LoadDataToListViewFromDB(sql); } private void txtName_TextChanged(object sender, EventArgs e) { string sql = @"select studentno,studentname,gender,gradename from student,grade where student.gradeid=grade.gradeid"; LoadDataToListViewFromDB(sql); } private void contextMenuStrip1_Opening(object sender, CancelEventArgs e) { } private void 修改基本信息ToolStripMenuItem_Click(object sender, EventArgs e) { //获取用户选择的学生号 int stuno = Convert.ToInt32(lvList.SelectedItems[0].Text); FrmAddStudemt frm = new FrmAddStudemt(); //在修改窗体出现之前,悄悄给学号文本框赋上用户选择修改的学生学号 frm.stuno = stuno; frm.Show(); // MessageBox.Show(stuno.ToString()); } private void toolStripMenuItem1_Click(object sender, EventArgs e) { } } }
5.帮助中的关于窗体
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 MySchool { public partial class FrmChangePics : Form { public FrmChangePics() { InitializeComponent(); } //定义一个变量保存图片索引值 private int index = 0; private void timer1_Tick(object sender, EventArgs e) { if (index < imgList.Images.Count - 1) { index++; } else { index = 0; } picImage.Image = imgList.Images[index]; } private void btnOk_Click(object sender, EventArgs e) { this.Close(); } private void FrmChangePics_Load(object sender, EventArgs e) { } } }
关于窗体设计,请听下回分解