editnews.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.Configuration;

namespace ExamineSystem
{
	/// <summary>
	/// Summary description for EditNews.
	/// </summary>
	public class EditNews : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox NewsTitle;
		protected System.Web.UI.WebControls.TextBox NewsBody;
		protected System.Web.UI.WebControls.Button UpdateNews;
		protected System.Web.UI.HtmlControls.HtmlGenericControl title;

		private int nNewsID = 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["NewsID"] != null)
			{
				nNewsID = Int32.Parse(Request.Params["NewsID"].ToString());
			}
			if(!Page.IsPostBack)
			{
				if(nNewsID > 0)
				{
					BindNewsData(nNewsID);
				}
			}
		}

		private void BindNewsData(int nNewsID)
		{
			if(nNewsID > 0)         ///首先判断新闻ID是否大于0，否则不从数据库取数据
			{   ///从数据库取到新闻ID为nNewsID的新闻的信息
				SqlConnection myConnection = new SqlConnection(DataBaseDB.ConnectionString);
				String cmdText = "SELECT * FROM News WHERE NewsID = '" + nNewsID.ToString() + "'";
				SqlCommand myCommand = new SqlCommand(cmdText,myConnection);
				myConnection.Open();
				SqlDataReader recn = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
				///给新闻标题框和新闻内容框初始化数据
				while(recn.Read())
				{
					NewsTitle.Text = recn["Title"].ToString();
					NewsBody.Text  = recn["Body"].ToString();
				}
				recn.Close();
			}
		}

		private void EditNewsBtn_Click(object sender, System.EventArgs e)
		{
			if(NewsTitle.Text.Trim().Length > 0 && NewsBody.Text.Trim().Length > 0)
			{   ///构建数据库连接和修改新闻的SQL语句
				SqlConnection myConnection = new SqlConnection(DataBaseDB.ConnectionString);
				String cmdText = "UPDATE NEWS SET Title = '" + NewsTitle.Text + "',Body = '" + NewsBody.Text 
					+ "' WHERE NewsID = '" + nNewsID.ToString() + "'";
				SqlCommand myCommand = new SqlCommand(cmdText,myConnection);
				///打开数据库连接并执行修改操作
				myConnection.Open();
				myCommand.ExecuteNonQuery();
				myConnection.Close();
				///返回新闻管理页面
				Response.Redirect("NewsManage.aspx");
			}
			else
			{
				Response.Write("<script>alert(\"新闻的标题不能为空！\")</script>");
			}
		}



		#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.UpdateNews.Click += new System.EventHandler(this.EditNewsBtn_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}