C#学生管理系统课题设计

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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Windows.Forms;

namespace CSharpDemo01
{
    
    
    public partial class frmMain : Form
    {
    
    
        private string fileName = string.Empty; //定义变量保存读取文件路径的变量
        private List<string> objListStudent = new List<string>();   //定义List存储读取到的学生信息
        private List<string> objListQuery = new List<string>(); //经过查询满足条件的学生信息
        private int actionFlag = 0; //通过actionFlag值判断添加还是修改actionFlag(1)添加，actionFlag(2)修改
        public frmMain()
        {
    
    
            InitializeComponent();
            //禁用明细区域
            gboxStudentDetail.Enabled = false;
        }


        //控件事件
       
        private void dgvStudent_SelectionChanged(object sender, EventArgs e)
        {
    
    
            if (dgvStudent.CurrentRow.Selected == false) return;
            else
            {
    
    
                string currentSNO = dgvStudent.CurrentRow.Cells[0].Value.ToString();//读取当前行的学号
                string[] currentDetail = GetStudentBySNO(currentSNO).Split(',');
                LoadDataToDetail(currentDetail[0], currentDetail[1], currentDetail[2], currentDetail[3], currentDetail[4],
                                                        currentDetail[5], currentDetail[6]);
            }
        }
        private void btnImport_Click(object sender, EventArgs e)//导入数据并展示数据
        {
    
    
            //【1】选择文件
            OpenFileDialog openfile = new OpenFileDialog();
            openfile.Filter = "csv文件(*.csv)|*.csv|TXT文件(*.txt)|*.txt|所有文件(*.*)|*.*";
            if (openfile.ShowDialog()==DialogResult.OK)
            {
    
    
                fileName = openfile.FileName;   //把文件的路径赋值为全局变量fileName
            }

            //【2】把文件的数据读取到List中
            try
            {
    
    
                //读取文件
                objListStudent = ReadFileToList(fileName);
            }
            catch (Exception ex)
            {
    
    
                MessageBox.Show("读取文件出现错误，具体错误如下：" + ex.Message, "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }

            //【3】把List中的数据展示在DataGridView中
            LoadDataToDataGrid(objListStudent);

            //【4】把DataGridView的第一行数据的明细展示在明细groupBox中
            string currentSNO = dgvStudent.Rows[0].Cells[0].Value.ToString();
            string[] currentDetail = GetStudentBySNO(currentSNO).Split(',');

            LoadDataToDetail(currentDetail[0], currentDetail[1], currentDetail[2], currentDetail[3], currentDetail[4],
                                                        currentDetail[5], currentDetail[6]);
        }
        private void txtQuerySNO_TextChanged(object sender, EventArgs e)//根据学号查询
        {
    
    
            //清空存储查询结果的List
            objListQuery.Clear();

            //查看当前那些满足条件并添加到QueryList中
            foreach(string item in objListStudent)
            {
    
    
                if (item.StartsWith(txtQuerySNO.Text))
                    objListQuery.Add(item);
            }
            //清空当前表格数据
            dgvStudent.Rows.Clear();
            //把查询结果展示在DataGridView中
            LoadDataToDataGrid(objListQuery);
        }
        private void txtQueryName_TextChanged(object sender, EventArgs e)//根据姓名查询
        {
    
    
            //清空存储查询结果的List
            objListQuery.Clear();

            //查看当前那些满足条件并添加到QueryList中
            foreach (string item in objListStudent)
            {
    
    
                if (item.Contains(txtQueryName.Text))
                    objListQuery.Add(item);
            }
            //清空当前表格数据
            dgvStudent.Rows.Clear();
            //把查询结果展示在DataGridView中
            LoadDataToDataGrid(objListQuery);
        }
        private void txtQueryMobile_TextChanged(object sender, EventArgs e)//根据电话号码查询
        {
    
    
            //清空存储查询结果的List
            objListQuery.Clear();

            //查看当前那些满足条件并添加到QueryList中
            foreach (string item in objListStudent)
            {
    
    
                if (item.Contains(txtQueryMobile.Text))
                    objListQuery.Add(item);
            }
            //清空当前表格数据
            dgvStudent.Rows.Clear();
            //把查询结果展示在DataGridView中
            LoadDataToDataGrid(objListQuery);
        }
        private void btnAdd_Click(object sender, EventArgs e)//添加学生信息
        {
    
    
            //添加过程：点击添加按钮-->输入数据-->判断是否有效-->提交

            //控制启用和禁用
            DisableButton();

            //让明细窗体中文本框清空
            txtSNO.Text = string.Empty;
            txtName.Text = string.Empty;
            dtpBirthday.Text = DateTime.Now.ToString();
            rbMale.Checked = true;
            txtMobile.Text = string.Empty;
            txtEmail.Text = string.Empty;
            txtHomeAddress.Text = string.Empty;

            //让学号的文本框获得焦点
            txtSNO.Focus();

            //修改actionFlag
            actionFlag = 1;
        }
        private void btnUpdate_Click(object sender, EventArgs e)//修改学生信息
        {
    
    
            //准备
            //控制按钮
            DisableButton();

            //学号不允许修改
            txtSNO.Enabled = false;

            //让学生姓名文本框获得焦点
            txtName.Focus();

            //修改ActionFlag
            actionFlag = 2;
        }
        private void btnDelete_Click(object sender, EventArgs e)//删除学生信息
        {
    
    
            if (dgvStudent.CurrentRow.Selected==false)
            {
    
    
                MessageBox.Show("删除数据前必须要选中一行", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            else
            {
    
    
                string info = "您确定要删除学生 【学号：" + dgvStudent.CurrentRow.Cells[0].Value.ToString() + "姓名：" +
                                                    dgvStudent.CurrentRow.Cells[1].Value.ToString() + "】信息吗？";
                DialogResult result = MessageBox.Show(info, "系统消息", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                if (result == DialogResult.Yes)
                {
    
    
                    string currentStudent = GetStudentBySNO(dgvStudent.CurrentRow.Cells[0].Value.ToString());
                    foreach (string item in objListStudent)
                    {
    
    
                        if (item.Equals(currentStudent))
                        {
    
    
                            objListStudent.Remove(item);
                            MessageBox.Show("学生信息删除成功！", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            //把添加后的List展示
                            dgvStudent.Rows.Clear();
                            LoadDataToDataGrid(objListStudent);
                            break;
                        }
                    }
                }
                else return;
            }
        }
        private void btnCommit_Click(object sender, EventArgs e)//提交添加和修改的操作
        {
    
    
            if (!VailDate()) return;
            else
            {
    
    
                //组合数据，准备添加到List中
                string sno = txtSNO.Text.Trim();
                string sname = txtName.Text.Trim();
                string sex = rbMale.Checked == true ? "男" : "女";
                string birthday = dtpBirthday.Text;
                string mobile = txtMobile.Text;
                string email = txtEmail.Text;
                string homeAddress = txtHomeAddress.Text;

                string currentStudent = sno + ',' + sname + ',' + sex + ',' + birthday + ',' + mobile + ','
                                + email + ',' + homeAddress;
                switch (actionFlag)
                {
    
    
                    case 1://添加
                        //把数据添加到List
                        objListStudent.Add(currentStudent);
                        //把添加后的List展示
                        dgvStudent.Rows.Clear();
                        LoadDataToDataGrid(objListStudent);
                        //显示添加成功
                        MessageBox.Show("学生信息添加成功", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        //控件按钮
                        EnableButton();
                        break;
                    case 2://修改
                        for (int i = 0; i < objListStudent.Count; i++)
                        {
    
    
                            if (objListStudent[i].StartsWith(sno))
                            {
    
    
                                //删除原有的
                                objListStudent.RemoveAt(i);
                                //插入添加的
                                objListStudent.Insert(i, currentStudent);
                                break;
                            }
                        }
                        //把添加后的List展示
                        dgvStudent.Rows.Clear();
                        LoadDataToDataGrid(objListStudent);
                        //显示修改成功
                        MessageBox.Show("学生信息修改成功", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        //控件按钮
                        EnableButton();
                        //把学号文本框启用
                        txtSNO.Enabled = true;
                        break;
                    default:
                        break;
                }
            }
        }
        private void btnCancel_Click(object sender, EventArgs e)//取消添加和修改
        {
    
    
            //控制按钮
            EnableButton();
        }
        private void btnClose_Click(object sender, EventArgs e)//退出
        {
    
    
            DialogResult result = MessageBox.Show("系统推出，是否要保存修改", "系统提示", 
                                                    MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (result == DialogResult.Yes)
            {
    
    
                //执行保存
                //【1】清空
                File.WriteAllText(fileName, string.Empty);

                //【2】把objList逐行写入
                StreamWriter sw = new StreamWriter(fileName, true, Encoding.Default);
                foreach (string item in objListStudent)
                {
    
    
                    sw.WriteLine(item);
                }
                sw.Close();
                //【3】写入完成
                MessageBox.Show("写入完成！", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            Close();
        }


        //用户自定义方法
        private List<string> ReadFileToList(string filePath)//把某一个文件读取，并以List方式返回给调用者
        {
    
    
            List<string> objList = new List<string>();
            string line = string.Empty;
            try
            {
    
    
                StreamReader file = new StreamReader(filePath, Encoding.Default);
                while ((line = file.ReadLine()) != null)
                {
    
    
                    objList.Add(line);
                }
                file.Close();
            }
            catch (Exception ex)
            {
    
    
                throw ex;
            }
            return objList;
        }
        private void LoadDataToDataGrid(List<string> objList)//把List中的数据展示在DataGridView中
        {
    
    
            //依次读取List中数据
            foreach (string item in objList)
            {
    
    
                string[] studentArray = item.Split(',');
                //把读取的当前学生插入到DataGirdView中
                DataGridViewRow row = new DataGridViewRow();
                row.CreateCells(dgvStudent);
                row.Cells[0].Value = studentArray[0];
                row.Cells[1].Value = studentArray[1];
                row.Cells[2].Value = studentArray[2];
                row.Cells[3].Value = studentArray[3];
                row.Cells[4].Value = studentArray[4];
                dgvStudent.Rows.Add(row);
            }
        }
        private void LoadDataToDetail(string sno, string sname, string sex, string birthday,
                            string mobile, string email, string homeAddress)//把一个学生的明细展示在明细groupBox中
        {
    
    
            txtSNO.Text = sno;
            txtName.Text = sname;
            if (sex == "男") rbMale.Checked = true;
            else rbFemale.Checked = true;
            dtpBirthday.Text = birthday;
            txtMobile.Text = mobile;
            txtEmail.Text = email;
            txtHomeAddress.Text = homeAddress;
        }
        private string GetStudentBySNO(string sno)//根据学号查到某一个学生的具体信息
        {
    
    
            string currentStudent = string.Empty;
            foreach (string item in objListStudent)
            {
    
    
                if (item.StartsWith(sno))
                {
    
    
                    currentStudent = item;
                    break;
                }
            }
            return currentStudent;
        }
        private void DisableButton()//禁用按钮
        {
    
    
            //禁用按钮
            btnAdd.Enabled = false;
            btnImport.Enabled = false;
            btnUpdate.Enabled = false;
            btnDelete.Enabled = false;

            //启用groupbox
            gboxStudentDetail.Enabled = true;
        }
        private void EnableButton()//启用按钮
        {
    
    
            //启用按钮
            btnAdd.Enabled = true;
            btnImport.Enabled = true;
            btnUpdate.Enabled = true;
            btnDelete.Enabled = true;

            //启用groupbox
            gboxStudentDetail.Enabled = false;
        }
        private bool VailDate() //用户添加和修改后数据的效验
        {
    
    
            bool b = true;
            //学号和姓名不能为空，学号不能重复（添加！）
            if (string.IsNullOrWhiteSpace(txtSNO.Text))//学号不能为空！
            {
    
    
                MessageBox.Show("学号不能为空！", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                txtSNO.Focus();
                b = false;
            }
            if (string.IsNullOrWhiteSpace(txtName.Text))//姓名不能为空！
            {
    
    
                MessageBox.Show("姓名不能为空！", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                txtName.Focus();
                b = false;
            }
            if (actionFlag == 1)
            {
    
    
                if (txtSNO.Text.Trim()==GetStudentBySNO(txtSNO.Text.Trim()).Split(',')[0])
                {
    
    
                    MessageBox.Show("该学号已经存在，请重新输入学号！", "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    txtSNO.Focus();
                    b = false;
                }
            }
            return b;
        }
    }
}