這篇文章將為大家詳細(xì)講解有關(guān)C#怎么實(shí)現(xiàn)簡單學(xué)生信息管理系統(tǒng),小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
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具體內(nèi)容如下
一、運(yùn)行環(huán)境windows,使用vs編譯軟件
二、主要功能
登錄、添加學(xué)生信息、修改學(xué)生信息、刪除學(xué)生信息、查詢學(xué)生信息
三、實(shí)現(xiàn)步驟
1、登陸界面功能實(shí)現(xiàn)
老規(guī)矩,先貼下主要代碼:
//構(gòu)造方法 public Login() { InitializeComponent(); this.label3.Parent = this; this.label1.BackColor = Color.Transparent; this.label2.BackColor = Color.Transparent; this.label3.BackColor = Color.Transparent; this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; } //對登錄按鈕的事件實(shí)現(xiàn)代碼 private void button1_Click(object sender, EventArgs e) { string ss = ConfigurationManager.ConnectionStrings["Stu"].ToString(); SqlConnection conn = new SqlConnection(ss); try { //開啟連接 conn.Open(); // MessageBox.Show("數(shù)據(jù)庫連接成功!"); } catch (Exception) { //MessageBox.Show("數(shù)據(jù)庫連接失敗!"); } String uname = txtName.Text.Trim(); string pword = txtPass.Text.Trim(); if(uname == ""|| pword == "") { MessageBox.Show("請輸入用戶名或密碼!"); return; } else { SqlCommand cmd = conn.CreateCommand(); SqlDataAdapter adp = new SqlDataAdapter(); string sql2 = "select * from account where name='"+ uname + " 'and pass='" + pword + " ' "; cmd.CommandText = sql2; adp.SelectCommand = cmd; DataSet dat = new DataSet(); adp.Fill(dat, "account"); if(dat.Tables["account"].Rows.Count == 0) { MessageBox.Show("用戶名或密碼錯(cuò)誤!"); return; } else { Form1.isLogin = true; Form1.username = this.txtName.Text; this.Close(); } cmd.Clone(); } conn.Close(); } //實(shí)現(xiàn)按ESC鍵關(guān)閉該窗口 protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) { switch (keyData) { case Keys.Escape: this.Close();//esc關(guān)閉窗體 break; } return false; } //重置按鈕清空文本框 private void button2_Click(object sender, EventArgs e) { txtName.Text = ""; txtPass.Text = ""; } //密碼輸入完成后實(shí)現(xiàn)敲擊enter鍵觸發(fā)登錄按鈕 private void txtPass_KeyDown(object sender, KeyEventArgs e) { if(e.KeyCode == Keys.Enter) { this.button1_Click(sender, e); } } //實(shí)現(xiàn)按enter鍵使焦點(diǎn)轉(zhuǎn)移到下一文本框,與tab鍵通用 private void txtName_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == (char)Keys.Enter) { SendKeys.Send("{tab}"); } }
效果如下圖:
2、主界面功能實(shí)現(xiàn)
主要代碼如下:
public static bool isLogin = false; int id; SqlConnection conn; SqlCommand cmd; SqlDataAdapter adp; DataSet dat; public static string username { get; set; } public Form1() { InitializeComponent(); this.label1.BackColor = Color.Transparent; this.groupBox1.BackColor = Color.Transparent; this.groupBox2.BackColor = Color.Transparent; this.dataGridView1.BorderStyle = BorderStyle.None; this.dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None; this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.Text += "| 管理員:" + username; string ss = ConfigurationManager.ConnectionStrings["Stu"].ToString(); //建立數(shù)據(jù)庫連接 conn = new SqlConnection(ss); try { //開啟連接 conn.Open(); // MessageBox.Show("數(shù)據(jù)庫連接成功!"); } catch (Exception) { MessageBox.Show("數(shù)據(jù)庫連接失敗!"); } } private void Form1_Load(object sender, EventArgs e) { DataGridViewDataLoad(); //this.stu_dentTableAdapter.Fill(this.students.Stu_dent); } private void DataGridViewDataLoad() { String sql1 = "select * from Stu_dent"; adp = new SqlDataAdapter(sql1,conn); dat = new DataSet(); adp.Fill(dat); dataGridView1.DataSource = dat.Tables[0]; } private void button5_Click(object sender, EventArgs e) { string num = textBox1.Text.Trim(); string name = textBox2.Text.Trim(); String sql4 = "Select * from Stu_dent where 1=1"; if(!String.IsNullOrEmpty(num)) { sql4 += " and StuNum=" + num; } if(!String.IsNullOrEmpty(name)) { sql4 += " and StuName like '%" + name + "%'"; } adp = new SqlDataAdapter(sql4, conn); dat = new DataSet(); adp.Fill(dat); dataGridView1.DataSource = dat.Tables[0]; } protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) { switch (keyData) { case Keys.Escape: this.Close();//esc關(guān)閉窗體 break; } return false; } private void button1_Click(object sender, EventArgs e) { AddStudent addStudent = new AddStudent(); addStudent.StartPosition = FormStartPosition.CenterScreen; //addStudent.Show(); addStudent.ShowDialog(); DataGridViewDataLoad(); } private void button4_Click(object sender, EventArgs e) { this.Close(); } private void button2_Click(object sender, EventArgs e) { MessageBox.Show("請?jiān)趯W(xué)生信息顯示框中雙擊所要?jiǎng)h除學(xué)生所在的那一行即可!!!","提示"); } private void button3_Click(object sender, EventArgs e) { MessageBox.Show("請?jiān)趯W(xué)生信息顯示框中單擊所要?jiǎng)h修改學(xué)生所在的那一行的任意文字區(qū)域即可!", "提示"); } private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e) { DialogResult result = MessageBox.Show("確定刪除該學(xué)生信息?", "刪除", MessageBoxButtons.OKCancel); if(result == DialogResult.OK) { id = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells[0].Value); Console.WriteLine(id); string sql2 = "delete from Stu_dent where ID=" + id; cmd = new SqlCommand(sql2, conn); cmd.ExecuteNonQuery(); } DataGridViewDataLoad(); } private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e) { id = Convert.ToInt32(this.dataGridView1.Rows[e.RowIndex].Cells[0].Value); UpdateStudent updatestudent = new UpdateStudent(id); updatestudent.StartPosition = FormStartPosition.CenterScreen; updatestudent.ShowDialog(); DataGridViewDataLoad(); }
效果如下:
3、添加學(xué)生信息功能實(shí)現(xiàn)
主要代碼如下:
public AddStudent() { InitializeComponent(); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; string ss = ConfigurationManager.ConnectionStrings["Stu"].ToString(); //建立數(shù)據(jù)庫連接 conn = new SqlConnection(ss); try { //開啟連接 conn.Open(); // MessageBox.Show("數(shù)據(jù)庫連接成功!"); } catch (Exception) { MessageBox.Show("數(shù)據(jù)庫連接失敗!"); } } private void AddStudent_Load(object sender, EventArgs e) { } private void label1_Click(object sender, EventArgs e) { } protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) { switch (keyData) { case Keys.Escape: this.Close();//esc關(guān)閉窗體 break; } return false; } private void button1_Click(object sender, EventArgs e) { string StuNum = textBox1.Text.Trim(); string StuName = textBox2.Text.Trim(); int StuAge; Int32.TryParse(textBox3.Text.Trim(), out StuAge); string StuClass = textBox5.Text.Trim(); string StuPhone = textBox6.Text.Trim(); string StuSex = radioButton1.Checked ? "男" : "女"; if (String.IsNullOrEmpty(StuNum)) { MessageBox.Show("學(xué)號不能為空!"); } if (String.IsNullOrEmpty(StuName)) { MessageBox.Show("姓名不能為空!"); } if (String.IsNullOrEmpty(StuClass)) { MessageBox.Show("班級不能為空!"); } if (String.IsNullOrEmpty(StuPhone)) { MessageBox.Show("聯(lián)系方式不能為空!"); } string sql = string.Format("insert into Stu_dent values ('{0}','{1}','{2}','{3}','{4}','{5}')", StuNum, StuName,StuAge,StuSex, StuClass, StuPhone ); cmd = new SqlCommand(sql, conn); int count = cmd.ExecuteNonQuery(); if (count > 0) { MessageBox.Show("添加成功!"); } else { MessageBox.Show("添加失敗!"); } this.Close(); }
4、刪除學(xué)生信息功能實(shí)現(xiàn)
在這里采用雙擊所要?jiǎng)h除學(xué)生所在的那一行的任意位置即可
主要代碼如下:
private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e) { DialogResult result = MessageBox.Show("確定刪除該學(xué)生信息?", "刪除", MessageBoxButtons.OKCancel); if(result == DialogResult.OK) { id = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells[0].Value); Console.WriteLine(id); string sql2 = "delete from Stu_dent where ID=" + id; cmd = new SqlCommand(sql2, conn); cmd.ExecuteNonQuery(); } DataGridViewDataLoad(); }
效果如下圖(雙擊第一行進(jìn)行刪除):
刪除前:
刪除后:
5、修改學(xué)生信息功能實(shí)現(xiàn)
在這里采用單擊所要修改學(xué)生所在行任意文字處即可
主要代碼如下:
public UpdateStudent(int id) { this.id = id; string ss = ConfigurationManager.ConnectionStrings["Stu"].ToString(); conn = new SqlConnection(ss); try { //開啟連接 conn.Open(); // MessageBox.Show("數(shù)據(jù)庫連接成功!"); } catch (Exception) { MessageBox.Show("數(shù)據(jù)庫連接失敗!"); } InitializeComponent(); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; } protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) { switch (keyData) { case Keys.Escape: this.Close();//esc關(guān)閉窗體 break; } return false; } private void UpdateStudent_Load(object sender, EventArgs e) { cmd = conn.CreateCommand(); string sql1 = "select * from Stu_dent where ID=" + id; cmd.CommandText = sql1; reader = cmd.ExecuteReader(); if(reader.HasRows) { reader.Read(); textBox1.Text = reader.GetString(1); textBox2.Text = reader.GetString(2); textBox3.Text = reader.GetInt32(3).ToString(); if(reader.GetString(4) == "男") { this.radioButton2.Checked = true; } else { this.radioButton1.Checked = true; } textBox5.Text = reader.GetString(5); textBox6.Text = reader.GetString(6); } reader.Close(); } private void button1_Click(object sender, EventArgs e) { string StuNum = textBox1.Text.Trim(); string StuName = textBox2.Text.Trim(); int StuAge; Int32.TryParse(textBox3.Text.Trim(), out StuAge); string StuClass = textBox5.Text.Trim(); string StuPhone = textBox6.Text.Trim(); string StuSex = radioButton1.Checked ? "男" : "女"; if (String.IsNullOrEmpty(StuName)) { MessageBox.Show("姓名不能為空!"); } if (String.IsNullOrEmpty(StuClass)) { MessageBox.Show("班級不能為空!"); } if (String.IsNullOrEmpty(StuPhone)) { MessageBox.Show("聯(lián)系方式不能為空!"); } string sql = string.Format("update Stu_dent set StuName='{0}',StuAge={1},StuSex='{2}',StuClass='{3}',StuPhone='{4}' where StuNum='{5}'", StuName, StuAge, StuSex, StuClass, StuPhone, StuNum); cmd = new SqlCommand(sql, conn); int count = cmd.ExecuteNonQuery(); if (count > 0) { MessageBox.Show("修改成功!"); } else { MessageBox.Show("修改失敗!"); } this.Close(); } private void button2_Click(object sender, EventArgs e) { cmd = conn.CreateCommand(); string sql1 = "select * from Stu_dent where ID=" + id; cmd.CommandText = sql1; reader = cmd.ExecuteReader(); if (reader.HasRows) { reader.Read(); textBox1.Text = reader.GetString(1); textBox2.Text = reader.GetString(2); textBox3.Text = reader.GetInt32(3).ToString(); if (reader.GetString(4) == "男") { this.radioButton2.Checked = true; } else { this.radioButton1.Checked = true; } textBox5.Text = reader.GetString(5); textBox6.Text = reader.GetString(6); } reader.Close(); }
(在這里將郭某某的專業(yè)班級為例)
修改前:
修改后:
6、查詢學(xué)生信息功能實(shí)現(xiàn)
查詢功能就寫了兩種查詢方式
主要代碼如下:
private void button5_Click(object sender, EventArgs e) { string num = textBox1.Text.Trim(); string name = textBox2.Text.Trim(); String sql4 = "Select * from Stu_dent where 1=1"; if(!String.IsNullOrEmpty(num)) { sql4 += " and StuNum=" + num; } if(!String.IsNullOrEmpty(name)) { sql4 += " and StuName like '%" + name + "%'"; } adp = new SqlDataAdapter(sql4, conn); dat = new DataSet(); adp.Fill(dat); dataGridView1.DataSource = dat.Tables[0]; }
效果如下:
按學(xué)號查詢:
按姓名查詢:
C#是一個(gè)簡單、通用、面向?qū)ο蟮木幊陶Z言,它由微軟Microsoft開發(fā),繼承了C和C++強(qiáng)大功能,并且去掉了一些它們的復(fù)雜特性,C#綜合了VB簡單的可視化操作和C++的高運(yùn)行效率,以其強(qiáng)大的操作能力、優(yōu)雅的語法風(fēng)格、創(chuàng)新的語言特性和便捷的面向組件編程從而成為.NET開發(fā)的首選語言,但它不適用于編寫時(shí)間急迫或性能非常高的代碼,因?yàn)镃#缺乏性能極高的應(yīng)用程序所需要的關(guān)鍵功能。
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