admin_class.aspx.cs

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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 WebNews.admin
{
	/// <summary>
	/// admin_class 的摘要说明。
	/// </summary>
	public class admin_class : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid MyDataGrid;
		protected System.Web.UI.WebControls.Label myLabel;
		protected System.Web.UI.WebControls.Label lblCurrentIndex;
		protected System.Web.UI.WebControls.Label lblPageCount;
		DataRow dr;
		string con=ConfigurationSettings.AppSettings["dsn"];
		public string oldclass;
		protected System.Web.UI.WebControls.LinkButton btnFirst;
		protected System.Web.UI.WebControls.LinkButton LinkButton2;
		protected System.Web.UI.WebControls.LinkButton LinkButton1;
		protected System.Web.UI.WebControls.LinkButton LinkButton3;
		public DataSet ds=new DataSet();
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
			if(!Page.IsPostBack)
			{
				string userclass;
				userclass=(string)Session["userclass"];
				if(userclass.Trim()=="系统管理员")
				{
					getClass();
				}
				else Page.Visible=false;
			}
		        
		}


		private void getClass()				   //得到头条新闻
		{
			try
			{	 
				string con=ConfigurationSettings.AppSettings["dsn"];
				SqlConnection  conn = new SqlConnection(con);//连接字符串
				conn.Open();
	　　   　　 
				SqlDataAdapter myCommand = new SqlDataAdapter();　　//创建SqlDataAdapter 类
			　	myCommand.SelectCommand=new SqlCommand("sp_selFclassAll",conn);
				myCommand.SelectCommand.CommandType=CommandType.StoredProcedure ;
				
				myCommand.Fill(ds,"class");
		　　　　
				 MyDataGrid.DataSource=ds;
				 MyDataGrid.DataBind();
				
		

				 lblCurrentIndex.Text="第"+((Int32)MyDataGrid.CurrentPageIndex+1)+"页";
				 lblPageCount.Text="/共"+MyDataGrid.PageCount+"页";
				//	MyDataGrid.DataSource=ds;			 //绑定
				//	MyDataGrid.DataBind();
			

				conn.Close();
			}
			catch(SqlException e)
			{
				Console.WriteLine("Exception in Main: " + e.Message);	//出错处理
			}	
		}

		private void updateArticle(string a,string b)				  //把所有具有原分类的文章分类名改成现有分类
		{
			try
			{
				SqlConnection  conn = new SqlConnection(con);//连接字符串
				conn.Open();
				SqlCommand cmd=new SqlCommand("sp_updateArticleByClass",conn);
				cmd.CommandType=CommandType.StoredProcedure;
				SqlParameter ce=cmd.Parameters.Add("@classname",SqlDbType.Char,200);
				ce.Value=a.Trim();
				SqlParameter oce=cmd.Parameters.Add("@oldclassname",SqlDbType.Char,200);
				oce.Value=b.Trim();
				int i=cmd.ExecuteNonQuery();

				if(i>0)
				{
				 
				}
			   conn.Close();
			}
			catch(SqlException e)
			{
				Console.WriteLine("Exception in Main: " + e.Message);	//出错处理
			}
		}

		private void delClass(object d)						 //删除分类
		{
			try
			{
				SqlConnection conn = new SqlConnection(con);//连接字符串
				 conn.Open();
					
				SqlCommand delClass=new SqlCommand("sp_delClass",conn);			
				delClass.CommandType=CommandType.StoredProcedure;
				SqlParameter cl=delClass.Parameters.Add("@classId",SqlDbType.BigInt);
				cl.Value=d;

				int i=delClass.ExecuteNonQuery();
				if(i>0)
				{
				   myLabel.Text="删除"+"成功";
				}
				   else	  myLabel.Text="删除"+"失败";
				conn.Close();

			}
			catch(SqlException er)
			{
				Console.WriteLine("Exception in Main: " + er.Message);	//出错处理
			}
		
		
		}

		public string show(object a)
		{
			   string b=a.ToString()  ;
				   return b;

		}
	public	void PagerButtonClick(Object sender, EventArgs e)
		{
			//获得LinkButton的参数值
			string arg = ((LinkButton)sender).CommandArgument;

    switch(arg)
			{
				case ("next"):
					if (MyDataGrid.CurrentPageIndex < (MyDataGrid.PageCount - 1))
						MyDataGrid.CurrentPageIndex ++;
					break;
				case ("prev"):
					if (MyDataGrid.CurrentPageIndex > 0)
						MyDataGrid.CurrentPageIndex --;
					break;
				case ("last"):
					MyDataGrid.CurrentPageIndex = (MyDataGrid.PageCount - 1);
					break;
		   case("first"):
			      MyDataGrid.CurrentPageIndex =0;
			      break;
		}
			getClass();
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		public void MyDataGrid_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			if(Page.IsValid)
			{
				try
				{
					SqlConnection  myConnection = new SqlConnection(con);//连接字符串
					myConnection.Open();
					
					TextBox classname=(TextBox)e.Item.Cells[1].Controls[1];				//取得TextBox中的控件值
					string clne=classname.Text.Trim();
					string oldname=(string)Session["oldclass"];
					if(clne==oldname)													
					{
						myLabel.Text="你分类名没改，没必要修改!";					   //分类没改,则不必修改

					}
					else
					{
						SqlCommand validateClass=new SqlCommand("sp_selFclass",myConnection);			
						validateClass.CommandType=CommandType.StoredProcedure;
						SqlParameter cl=validateClass.Parameters.Add("@className",SqlDbType.Char,200);
						cl.Value=classname.Text;
						SqlDataReader validateReader=validateClass.ExecuteReader();
						if(validateReader.Read()==true)													//如分类名已有，重输
						{
							myLabel.Text="已有此分类名，请重新输入一个！！";
							validateReader.Close();
							myConnection.Close();
						}
						else 
						{
							try
			{
						  	validateReader.Close();
							myConnection.Close();
							SqlConnection cont = new SqlConnection(con);
							cont.Open();
							SqlCommand updateClass=new SqlCommand("sp_updateClass",cont);   //通过存储过程更新
							updateClass.CommandType=CommandType.StoredProcedure;
							SqlParameter sd=updateClass.Parameters.Add("@className",SqlDbType.Char,200);
							sd.Value=clne.Trim();
							SqlParameter se=updateClass.Parameters.Add("@oldclassname",SqlDbType.Char,200);
							se.Value=oldname.Trim();

							int rt=updateClass.ExecuteNonQuery();	//更新
								if(rt>0)
								{
									myLabel.Text="更新成功！";
									cont.Close();
									updateArticle(clne.Trim(),oldname.Trim())	;
									MyDataGrid.EditItemIndex = -1;		//回到编辑状态
									
								
									getClass();								  
								}
								else
								{
									myLabel.Text="更新错误！";
									cont.Close();
								}				
							}   

							catch(SqlException er)
							{
								Console.WriteLine("Exception in Main: " + er.Message);	//出错处理
							}
						}
						
					}
				}
				catch(SqlException er)
				{
					Console.WriteLine("Exception in Main: " + er.Message);	//出错处理
				}
			}
		}
		public void MyDataGrid_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			   string num=e.Item.Cells[2].Text;	   //取得文章数
			 
			
			   num=num.Trim();
			if(num!="0")								 //验证分类是否有文章 
			{
				myLabel.Text="你不能删除有文章数的分类!";
			}
			else
			{
			   delClass(this.MyDataGrid.DataKeys[e.Item.ItemIndex]);
				int d=MyDataGrid.PageCount % MyDataGrid.PageSize;
				if(d==0)
				{

					MyDataGrid.CurrentPageIndex= MyDataGrid.CurrentPageIndex-1;
				}
				
			   getClass();
			}

		}

		public void MyDataGrid_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			this.MyDataGrid.EditItemIndex = -1;
			
			getClass();
		}

		public void MyDataGrid_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
		{
			this.MyDataGrid.EditItemIndex = e.Item.ItemIndex;
			 
			getClass();

			dr=ds.Tables["class"].Rows[MyDataGrid.EditItemIndex]  ;  //取得popedom字段
		    
			oldclass=(string)dr["className"];
			oldclass=oldclass.Trim();
			Session["oldclass"]=oldclass;
			Response.Write(Session["oldclass"]);
		}

		public void MyDataGrid_SelectedIndexChanged(object sender,System.EventArgs e)
		{
			        
					  getClass();
		}


	}
}