学生管理系统

2019-11-14 13:43:23

字体：大中小

来源：转载

供稿：网友

1.登录窗体

基本控件：

ｌａｂｅｌ（标签控件）

主要属性：Image（在标签上显示的图像）

Text（在标签上显示的文本）

TextBox（文本框控件）

主要属性：PassWordChar(指示在作为密码框时，文本框中显示的字符，而不是实际输入的文本)

Button（按钮控件）

ComboBox（下拉框）属性：SelectedItem：获取当前选定的项

事件：Click（单击控件时发生）

PRivate void butStyle_Click(object sender, EventArgs e)        {            string str = "Data source=.;Initial catalog=Myschool;uid=sa";            SqlConnection con = new SqlConnection(str);            string sql = "select count(1) from student where studentName='" + txtUserName.Text + "' and LoginPwd='" + txtPwd.Text + "'";            SqlCommand cmd = new SqlCommand(sql, con);            try            {                con.Open();                int count = Convert.ToInt32(cmd.ExecuteScalar());                if (count > 0)                {                  MessageBox.Show("登陆成功");                    this.Hide();                    FormMain frm = new FormMain();                    frm.Show();                }            }            catch (Exception)            {                MessageBox.Show("退出");            }            finally            {                con.Close();            }

Sender是事件源，表示发生了这个事件的对象，事件发生中，事件源就是按钮。

e是事件参数（EventArgs）对象，不同的事件会有不同的参数。

Close（）方法是窗体类Form的一个方法，作用是关闭窗体。

2.Myschool管理员

01.给菜单栏中的“新增学生”菜单项添加事件处理程序，代码如下

private void 新增学生ToolStripMenuItem_Click(object sender, EventArgs e)        {            FormStudent formStudent = new FormStudent();            formStudent.Show();        }

02.添加学生信息

 public void Save()        {            //添加学生            string pwd = txtpwd.Text;            string stuname = textname.Text;            //性别            string stugender = string.Empty;            if (radioman.Checked)            {                stugender = "1";            }            else            {                stugender = "0";            }            //下拉框绑定数据            int gid = GeadIdName();            //联系电话            string StuPhone = textphone.Text;            //地址            string StuAddress = textAddress.Text;            //日期            DateTime dt = dateBirthday.Value;            //邮箱            string StuEmail = textEmail.Text;            //LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email            string sql = "insert into Student values('" + pwd + "','" + stuname + "','" + stugender + "'," + gid + ",'" + StuPhone + "','" + StuAddress + "','" + dt + "','" + StuEmail + "')";            string str = "Data source=.;Initial catalog=Myschool;uid=sa;";            SqlConnection con = new SqlConnection(str);            SqlCommand cmd = new SqlCommand(sql, con);            con.Open();            int count = cmd.ExecuteNonQuery();            if (count > 0)            {                MessageBox.Show("添加成功");                             }            con.Close();        }

3.查询学生信息

//查询学生信息        public void LodaDataListView(string sql)        {            string str = "data source=.;initial catalog=Myschool;uid=sa;";            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())                        {                            int stuNo = Convert.ToInt32(dr["studentNo"]);                            //姓名                            string stuname = Convert.ToString(dr["studentName"]);                            //性别                            string stuGender = Convert.ToString(dr["Gender"]);                            //年级名次                            string stuGname = Convert.ToString(dr["Gradename"]);                            ListViewItem LvItem = new ListViewItem(stuNo.ToString());                            LvItem.SubItems.Add(stuname);                            LvItem.SubItems.Add(stuGender);                            LvItem.SubItems.Add(stuGname);                            //让lvItem和ListView关联                            lvlist.Items.Add(LvItem);                        }                        dr.Close();                    }                }            }            catch (Exception)            {                throw;            }            finally            {                con.Close();            }

//窗体Load的事件中调用

private void Formselect_Load(object sender, EventArgs e)        {            string sql = "select StudentNO,StudentName,Gender,GradeName from Student,Grade where Student.GradeId=Grade.GradeId";            LodaDataListView(sql);        }

修改学生信息

public void upatae()        {            //添加学生            string pwd = txtpwd.Text;            string stuname = textname.Text;            //性别            string stugender = string.Empty;            if (radioman.Checked)            {                stugender = "1";            }            else            {                stugender = "0";            }            //下拉框绑定数据            int gid = GeadIdName();            //联系电话            string StuPhone = textphone.Text;            //地址            string StuAddress = textAddress.Text;            //日期            DateTime dt = dateBirthday.Value;            //邮箱            string StuEmail = textEmail.Text;            //LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email            string sql = @"update Student set StudentName='" + stuname + "',Gender=" + stugender + ",GradeId='" + gid + "',phone='" + StuPhone + "',Address='" + StuAddress + "',Birthday='" + dt + "',Email='" + StuEmail                + "' where studentNo='" + textNo.Text + "'";            string str = "Data source=.;Initial catalog=Myschool;uid=sa;";            SqlConnection con = new SqlConnection(str);            SqlCommand cmd = new SqlCommand(sql, con);            con.Open();            int count = cmd.ExecuteNonQuery();            if (count > 0)            {                frmselect.selectData();                MessageBox.Show("修改成功");            }            con.Close();        }