在线考试系统随机抽题答题整理部分代码
//登陆页面验证码代码
private string RndNum(int VcodeNum)
{
string MaxNum = "";
string MinNum = "";
for (int i = 0; i < 5; i++)//这里的4是验证码的位数
{
MaxNum = MaxNum + "5";
}
MinNum = MaxNum.Remove(0, 1);
Random rd = new Random();
string VNum = Convert.ToString(rd.Next(Convert.ToInt32(MinNum), Convert.ToInt32(MaxNum)));
return VNum;
}
//在线考试系统公共类的设计代码
public class BaseClass
{
public BaseClass()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public static SqlConnection DBCon() 建立数据库的公共方法
{
return new SqlConnection("server=.;database=db_ExamOnline;uid=sa;pwd=123456");
}
public static void BindDG(GridView dg, string id, string strSql, string Tname)
{
SqlConnection conn = DBCon(); //连接数据库
SqlDataAdapter sda = new SqlDataAdapter(strSql, conn);
DataSet ds = new DataSet();
sda.Fill(ds, Tname);
dg.DataSource = ds.Tables[Tname];
dg.DataKeyNames = new string[] { id };
dg.DataBind();
}
public static void OperateData(string strsql) //建立一个执行sql语句的方法
{
SqlConnection conn = DBCon();
conn.Open();
SqlCommand cmd = new SqlCommand(strsql, conn);
cmd.ExecuteNonQuery();
conn.Close();
}
//================如果是学生登录=========================================
public static bool CheckStudent(string studentNum, string studentPwd)
{
SqlConnection conn = DBCon();
conn.Open();
SqlCommand cmd = new SqlCommand("select count(*) from tb_Student where StudentNum='" + studentNum + "' and StudentPwd='" + studentPwd + "'", conn);
int i = Convert.ToInt32(cmd.ExecuteScalar()); //返回值
if (i > 0)
{
return true;
}
else
{
return false;
}
conn.Close();
}
//================如果是教师登录=========================================
public static bool CheckTeacher(string teacherNum, string teacherPwd)
{
SqlConnection conn = DBCon();
conn.Open();
SqlCommand cmd = new SqlCommand("select count(*) from tb_Teacher where TeacherNum='" + teacherNum + "' and TeacherPwd='" + teacherPwd + "'", conn);
int i = Convert.ToInt32(cmd.ExecuteScalar());
if (i > 0)
{
return true;
}
else
{
return false;
}
conn.Close();
}
//================如果是管理员登录=========================================
public static bool CheckAdmin(string adminNum, string adminPwd)
{
SqlConnection conn = DBCon();
conn.Open();
SqlCommand cmd = new SqlCommand("select count(*) from tb_Admin where AdminNum='" + adminNum + "' and adminPwd='" + adminPwd + "'", conn);
int i = Convert.ToInt32(cmd.ExecuteScalar());
if (i > 0)
{
return true;
}
else
{
return false;
}
conn.Close();
}
}
//随机抽题答题代码
public partial class student_StartExam : System.Web.UI.Page
{
public string Ans = null;
public int tNUM;
protected void Page_Load(object sender, EventArgs e)
{
lblEndtime.Text = "考试时间为10分钟，每小题2分，考试已用时：";
lblStuNum.Text = Session["ID"].ToString();
lblStuName.Text = Session["name"].ToString();
lblStuSex.Text = Session["sex"].ToString();
lblStuKM.Text = "[" + Session["KM"].ToString() + "]" + "考试试题";
int i = 1;
SqlConnection conn = BaseClass.DBCon();
conn.Open();
//从数据表中随机抽取十条数据
SqlCommand cmd = new SqlCommand("select top 10 * from tb_test where testCourse='" + Session["KM"].ToString() + "' order by newid()", conn);
SqlDataReader sdr = cmd.ExecuteReader();
while (sdr.Read())
{
Literal littxt = new Literal(); 创建literal 控件
Literal litti = new Literal();
RadioButtonList cbk = new RadioButtonList();
cbk.ID = "cbk" + i.ToString();
littxt.Text = i.ToString() + "、" + Server.HtmlEncode(sdr["testContent"].ToString()) + "
";";
litti.Text = "
cbk.Items.Add("A. " + Server.HtmlEncode(sdr["testAns1"].ToString())); //添加A,B,C,D选项
cbk.Items.Add("B. " + Server.HtmlEncode(sdr["testAns2"].ToString()));
cbk.Items.Add("C. " + Server.HtmlEncode(sdr["testAns3"].ToString()));
cbk.Items.Add("D. " + Server.HtmlEncode(sdr["testAns4"].ToString()));
cbk.Font.Size = 11;
for (int j = 1; j <= 4; j++)
{
cbk.Items[j - 1].Value = j.ToString();
}
Ans += sdr[6].ToString();
if (Session["a"] == null)
{
Session["Ans"] = Ans;
}
Panel1.Controls.Add(littxt); //将控件添加到Panel中
Panel1.Controls.Add(cbk);
Panel1.Controls.Add(litti);
i++;
tNUM++;
}
sdr.Close();
conn.Close();
Session["a"] = 1;
}
protected void btnsubmit_Click(object sender, EventArgs e)
{
string msc = "";
for (int i = 1; i <= tNUM; i++)
{
RadioButtonList list = (RadioButtonList)Panel1.FindControl("cbk" + i.ToString());
if (list != null)
{
if (list.SelectedValue.ToString() != "")
{
msc += list.SelectedValue.ToString();
}
else
{
msc += "0";
}
}
}
Session["Sans"] = msc;//考生答案
string sql = "update tb_score set RigthAns='" + Ans + "' where StudentID='" + lblStuNum.Text + "'";
BaseClass.OperateData(sql);
string strsql = "update tb_score set StudentAns='" + msc + "' where StudentID='" + lblStuNum.Text + "'";
BaseClass.OperateData(strsql);
Response.Redirect("result.aspx?BInt=" + tNUM.ToString());
}
}