editquestion.aspx.cs

用ASP.NET（C#）、SQL Server2000数据库开发在线考试系统源代码

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;

namespace ExamineSystem
{
	/// <summary>
	/// Summary description for EditQuestion.
	/// </summary>
	public class EditQuestion : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox QuesTitle;
		protected System.Web.UI.WebControls.TextBox QuesBody;
		protected System.Web.UI.WebControls.TextBox Defficult;
		protected System.Web.UI.WebControls.TextBox Mark;
		protected System.Web.UI.WebControls.DropDownList QuesKindList;
		protected System.Web.UI.WebControls.Button PreviewQuestion;
		protected System.Web.UI.HtmlControls.HtmlGenericControl title;
		protected System.Web.UI.WebControls.Button UpdateQuestion;
		protected System.Web.UI.HtmlControls.HtmlInputFile QuesPicture;

		private int nQuestionID = 0;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			///验证用户的权限
			if(Session["UserID"] == null)
			{
				Response.Redirect("~/Default.aspx");
			}
			

			if(Request.Params["QuestionID"] != null)
			{
				nQuestionID = Int32.Parse(Request.Params["QuestionID"].ToString());
			}
			if(!Page.IsPostBack)
			{
				BindQuesKindData();
				if(nQuestionID > 0)
				{
					BindQuestionData(nQuestionID);
				}
			}
		}

		private void BindQuesKindData()
		{
			QuesKindList.Items.Clear();

			QuestionDB question = new QuestionDB();
			SqlDataReader rect = question.GetQuestionKinds();

			QuesKindList.DataSource = rect;
			QuesKindList.DataTextField = "KindName";
			QuesKindList.DataValueField = "KindID";
			QuesKindList.DataBind();

			rect.Close();
		}

		private void BindQuestionData(int nQuestionID)
		{
			QuestionDB question = new QuestionDB();
			SqlDataReader recq = question.GetSingleQuestion(nQuestionID);
			while(recq.Read())
			{
				QuesTitle.Text = recq["Title"].ToString();
				QuesBody.Text  = recq["Body"].ToString();
				Defficult.Text = (Decimal.Parse(recq["Defficult"].ToString())/100).ToString();
				Mark.Text      = recq["Mark"].ToString();
				SetListIndex(recq);
				QuesPicture.Disabled = true;
			}
			recq.Close();
		}

		private void SetListIndex(SqlDataReader recq)
		{
			for(int i = 0; i < QuesKindList.Items.Count; i++)
			{
				if(QuesKindList.Items[i].Value == recq["KindID"].ToString())
				{
					QuesKindList.SelectedIndex = i;
					break;
				}
			}
		}

		private int UpPictureFile(HtmlInputFile UpLoadFile)
		{
			PictureDB picture = new PictureDB();
			int nPictureID = 0;

			if(UpLoadFile.PostedFile.ContentLength > 0)
			{
				String fileName = UpLoadFile.PostedFile.FileName.Substring(UpLoadFile.PostedFile.FileName.LastIndexOf("\\"),
					UpLoadFile.PostedFile.FileName.Length - UpLoadFile.PostedFile.FileName.LastIndexOf("\\"));
				
				String fileTime = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() 
					+ DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() 
					+ DateTime.Now.Second.ToString() + DateTime.Now.Minute.ToString()
					+ DateTime.Now.Millisecond.ToString();

				fileName = "\\" + fileTime + GetRandomint() 
					+ fileName.Substring(fileName.IndexOf("."),fileName.Length - fileName.IndexOf("."));

				if(File.Exists(Server.MapPath(Request.ApplicationPath) + "\\UpLoads\\Files" + fileName) == false)
				{
					try
					{
						UpLoadFile.PostedFile.SaveAs(Server.MapPath(Request.ApplicationPath) + "\\UpLoads\\Files" + fileName);

						nPictureID = picture.AddPicture("","\\UpLoads\\Files" + fileName);
					}
					catch(Exception ex)
					{
						string sRawURL = Request.RawUrl;

						if(sRawURL.IndexOf("?") > -1)
						{
							sRawURL = sRawURL.Substring(0,sRawURL.IndexOf("?"));
						}				
						Response.Redirect("~/DesktopModules/ErrorPage.aspx?ErrorUrl="
							+ sRawURL + "&ErrorMessage=" + ex.Message.Replace("\n"," "));
					}
				}
				else
				{
					Response.Write("<script>alert(\"此文件已经存在，请重新命名你的文件！\")</script>");
				}
			}
			else
			{
				Response.Write("<script>alert(\"文件名和内容不能为空！\")</script>");
			}

			return(nPictureID);
		}

		private String GetRandomint()
		{
			Random random = new Random();

			return(random.Next(10000).ToString());
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.UpdateQuestion.Click += new System.EventHandler(this.UpdateQuestion_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void UpdateQuestion_Click(object sender, System.EventArgs e)
		{
			int nPictureID = 0;
			QuestionDB question = new QuestionDB();
			if(QuesPicture.Disabled == false)
			{
				if(QuesPicture.PostedFile.ContentLength > 0)
				{
					nPictureID = UpPictureFile(QuesPicture);
				}
			}
			Decimal diffcult = Decimal.Parse(Defficult.Text.Trim());
			string tempDiffcult = (100 * diffcult).ToString();
			string diffcultString = tempDiffcult.Substring(0,tempDiffcult.IndexOf("."));
			
			question.UpdateQuestion(nQuestionID,QuesTitle.Text,QuesBody.Text,Int32.Parse(diffcultString),
				Int32.Parse(Mark.Text.Trim()),Int32.Parse(QuesKindList.SelectedValue),nPictureID);

			Response.Write("<script>alert(\"修改问题参数成功！！！\")</script>");
		}	
	}
}