题目一：编写C#程序：在D盘根目录下创建一个以自己的学号命名的目录，然后在该目录下创建一个（自己学号.txt）的文本文件，在该文件中写入自己的学号、姓名、学校、专业、英语成绩等信息；然后再读出文件中的信息显示到屏幕上。
源程序：
namespace Demo1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
}
private void button2_Click(object sender, EventArgs e)
{
string path = "d:\\19200135226";
string fileName = "19200135226.txt";
if (!System.IO.Directory.Exists(path))
{
System.IO.Directory.CreateDirectory(path);
}
System.IO.File.AppendText(System.IO.Path.Combine(path, fileName)).Close();
string text = "学号：123456789\n姓名：摆烂\n学校：苏州大学\n专业：计算机科学与技术\nC#成绩：100\nCSDN博主：书启秋枫";
System.IO.File.WriteAllText(@"d:\\19200135226\\19200135226.txt", text);
MessageBox.Show("写入成功！", "信息注入");
richTextBox1.Text = text;
}
}
}运行结果：
题目二：创建一个学生信息系统登录界面，有输入用户名、密码功能，以及具有注册的功能。在学生初次使用时，可进行注册。注册成功后，再次登录可进入系统管理界面，在系统管理界面可进行学生注册信息的查询、修改操作。
该系统提供学生的注册、及管理信息管理功能页面可由学生自行设计。要求采用SQL Server数据库，通过编程方式实现。
源程序：
public partial class Main : Form
{
public Main()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
}
private void registBtn_Click(object sender, EventArgs e)
{
Register register = new Register();
register.Show();
}
private void loginBtn_Click(object sender, EventArgs e)
{
Login login = new Login();
login.Show();
}
private void Main_Load(object sender, EventArgs e)
{
// TODO: 这行代码将数据加载到表“s_TDataSet1.users”中。您可以根据需要移动或移除它。
this.usersTableAdapter.Fill(this.s_TDataSet1.users);
}
}
public partial class Register : Form
{
public Register()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
}
static String connStr = "Data Source=DESKT******62P;Initial Catalog=S_T;Persist Security Info=True;User ID=sa;Password=*******";
private void submit_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
string sql2 = "INSERT INTO users (user_id, username, password) VALUES ("+ new Random().Next(99999) + ", '"+username.Text+"', '"+password.Text+"')";
SqlCommand cmd = new SqlCommand(sql2, conn);
int i = cmd.ExecuteNonQuery();
if (i == 1)
{
MessageBox.Show("注册成功！");
this.Close();
}
else
{
MessageBox.Show("注册失败！");
}
}
}
public partial class Login : Form
{
public Login()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
}
static String connStr = "Data Source=DESKT*****V62P;Initial Catalog=S_T;Persist Security Info=True;User ID=sa;Password=*******";
private void submit_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
string sql2 = "SELECT count(*) count FROM users where username='"+username.Text+"' and password = '"+password.Text+"'";
SqlCommand cmd = new SqlCommand(sql2, conn);
int i = (int)cmd.ExecuteScalar();
if (i > 0)
{
MessageBox.Show("登录成功！");
ManageStudent manage = new ManageStudent();
manage.Show();
this.Close();
}
else
{
MessageBox.Show("登录失败！");
}
}
}
public partial class AddStudent : Form
{
public AddStudent()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
}
private SqlConnection conn;
private ManageStudent manage;
public AddStudent(SqlConnection conn, ManageStudent manage)
{
this.conn = conn;
this.manage = manage;
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string sql2 = "insert into student (Sno, Sname, Ssex, Sage , Sdept) VALUES ('"+ sno.Text + "', '"+Sname.Text+"', '"+Ssex.Text+"', "+Sage.Text+", '"+Sdept.Text+"')";
SqlCommand cmd = new SqlCommand(sql2, conn);
MessageBox.Show(sql2);
cmd.ExecuteNonQuery();
conn.Close();
Console.Write(sql2);
MessageBox.Show("添加成功！");
manage.Load();
this.Close();
}
}
public partial class UpdateStudent : Form
{
public UpdateStudent()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
}
private void button1_Click_1(object sender, EventArgs e)
{
int Sno = Convert.ToInt32(this.sno.Text);
Console.WriteLine(Sno);
string sql2 = "update student set Sname = '" + Sname.Text + "',Ssex = '" + Ssex.Text + "',Sage = '" + Sage.Text + "',Sdept = '" + Sdept.Text + "' where Sno =" + Sno;
SqlCommand cmd = new SqlCommand(sql2, conn);
cmd.ExecuteNonQuery();
conn.Close();
Console.Write(sql2);
MessageBox.Show("修改成功！");
this.status = -1;
manage.Load();
this.Close();
}
}
public partial class ManageStudent : Form
{
static String connStr = "Data Source=DESKT****UV62P;Initial Catalog=S_T;Persist Security Info=True;User ID=sa;Password=*******";
SqlCommand cmd;
int RowIndex = -1;
public ManageStudent()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
Load();
}
public void Load()
{
this.ManageStudent_Load(null,null);
}
private void ManageStudent_Load(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
String sql = "SELECT Sno,replace(Sname,' ','') Sname,Ssex,Sage,replace(Sdept,' ','') Sdept from student";
SqlCommand cmd = new SqlCommand(connStr);
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
adapter.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];
conn.Close();
}
private void button4_Click(object sender, EventArgs e)
{
for (int i=0; i < dataGridView1.Rows.Count; i++)
{
if (dataGridView1.Rows[i].Selected == true)
{
RowIndex = i;
}
}
if (RowIndex == -1)
{
MessageBox.Show("请选择学生再删除！");
}
else {
DialogResult result = MessageBox.Show("确定删除"+ dataGridView1.Rows[RowIndex].Cells[1].Value + "的信息？", "删除", MessageBoxButtons.OKCancel);
int Sno = 0;
if (result == DialogResult.OK)
{
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
Sno = Convert.ToInt32(dataGridView1.Rows[RowIndex].Cells[0].Value);
Console.WriteLine(Sno);
string sql2 = "delete from student where Sno =" + Sno;
cmd = new SqlCommand(sql2, conn);
cmd.ExecuteNonQuery();
RowIndex = -1;
}
ManageStudent_Load(sender, e);
}
}
private void button2_Click(object sender, EventArgs e)
{
for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
if (dataGridView1.Rows[i].Selected == true)
{
RowIndex = i;
}
}
if (RowIndex == -1)
{
MessageBox.Show("请选择学生再修改！");
}
else
{
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
ManageStudent manage = this;
UpdateStudent updateStudent = new UpdateStudent(dataGridView1.Rows[RowIndex].Cells,conn, manage);
updateStudent.Show();
ManageStudent_Load(sender, e);
}
}
private void button1_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(connStr);
conn.Open();
ManageStudent manage = this;
AddStudent addStudent = new AddStudent(conn, manage);
addStudent.Show();
ManageStudent_Load(sender, e);
}
private void button3_Click(object sender, EventArgs e)
{
Main main = new Main();
main.Show();
this.Close();
}
private void ManageStudent_Load_2(object sender, EventArgs e)
{
this.studentTableAdapter.Fill(this.s_TDataSet.Student);
}
}