questionmanage.aspx.cs

基于Asp.net三层结构的在线考试系统

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using OnLineExam.BusinessLogicLayer;

public partial class Web_QuestionManage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string loginName = Session["userID"].ToString();
            Users user = new Users();
            user.LoadData(loginName);
            labUser.Text = user.UserName;     
            InitDDLData();  //初始化考试科目          
        }
    }
    //初始化考试科目
    protected void InitDDLData()
    {
        Course course = new Course();       //创建考试科目对象
        DataSet ds = course.QueryCourse();  //查询考试科目信息
        ddlCourse.DataSource = ds;          //指名考试科目列表框数据源
        ddlCourse.DataTextField = "Name";   //DataTextField显示Name字段值
        ddlCourse.DataValueField = "ID";    //DataValueField显示ID字段值
        ddlCourse.DataBind();               //绑定数据
        GridViewBind();
    }
    //显示选择科目的单选题
    protected void ddlCourse_SelectedIndexChanged(object sender, EventArgs e)
    {
        GridViewBind();//为GridView绑定数据
    }
    //GridView控件绑定数据事件
    protected void GridViewBind()
    {
        QuestionProblem questionproblem = new QuestionProblem();  //创建单选题对象
        DataSet ds = questionproblem.QueryQuestionProblem(int.Parse(ddlCourse.SelectedValue));//根据考试科目查询问答题信息
        GridView1.DataSource = ds.Tables[0].DefaultView;    //为GridView控件指名数据源
        GridView1.DataBind();                               //绑定数据
    }
    //删除试题事件
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        QuestionProblem questionproblem = new QuestionProblem();  //创建问答题对象
        int ID = int.Parse(GridView1.DataKeys[e.RowIndex].Values[0].ToString()); //取出要删除记录的主键值
        if (questionproblem.DeleteByProc(ID))
        {
            Response.Write("<script language=javascript>alert('成功删除试题！')</script>");
        }
        else
        {
            Response.Write("<script language=javascript>alert('删除试题失败！')</script>");
        }
        GridView1.EditIndex = -1;
        GridViewBind();//重新绑定数据
    }
    //删除多条记录
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        QuestionProblem question = new QuestionProblem();//创建SingleProblem对象        
        foreach (GridViewRow dr in GridView1.Rows)//对GridView中的每一行进行判断
        {
            if (((CheckBox)dr.FindControl("xuanze")).Checked)//如果选择了进行删除
            {
                int ID = int.Parse(((Label)dr.FindControl("Label1")).Text);
                question.ID = ID;
                question.DeleteByProc(ID);
            }
        }
    }
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        GridViewBind();//重新绑定数据
    }

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[2].ToolTip = e.Row.Cells[2].Text;
            if ((e.Row.Cells[2].Text).Length > 30)
            {
                e.Row.Cells[2].Text = (e.Row.Cells[2].Text).Substring(0, 30) + "...";
            }
            
            if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
            {
                ((LinkButton)e.Row.Cells[4].Controls[0]).Attributes.Add("onclick", "javascript:return confirm('你确认要删除\"" + e.Row.Cells[2].Text + "\"吗?')");
            }

        }    
        int i;
        //执行循环，保证每条数据都可以更新
        for (i = 0; i < GridView1.Rows.Count; i++)
        {
            //首先判断是否是数据行
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //当鼠标停留时更改背景色
                e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='Aqua'");
                //当鼠标移开时还原背景色
                e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
            }
        }
    }
}