book.aspx.cs

图书馆的图书管理

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 System.Data.SqlClient;
public partial class bookdetails : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Session["uname"] == null)
            {
                Response.Write("<script language='javascript'>alert('您还没有注册或登陆');location.href='Login.aspx'</script>");

            }
            if (Session["str"] != null)
            {
                BookBinder();//显示检索的期刊
            }
          
        }
    }
    private void BookBinder()//显示期刊
    {
        try
        {
            string str = Session["str"].ToString();
            //连接数据库
            SqlConnection con = db.ceratcon();
            con.Open();

            SqlDataAdapter sdr = new SqlDataAdapter(str, con);
            DataSet ds = new DataSet();//这里只能用SqlDataAdapter不能用datareader 对象否则出错成服务器端无法分页
            sdr.Fill(ds, "Book");
            this.GridView1.DataSource = ds.Tables["Book"].DefaultView;//用默认的视图填充表格
            this.GridView1.AllowPaging = true;//设置可以分页
            this.GridView1.PageSize = 20;//设置分页大小
            this.GridView1.DataBind();
            if (this.GridView1.PageIndex == 0)//判断当在第一页时按扭的可以不可以使用
            {
                this.LinkButton2.Enabled = false;
                this.LinkButton3.Enabled = false;
                
            }
            else
            {
               
                this.LinkButton2.Enabled = true;
                this.LinkButton3.Enabled = true;
            }
            if (this.GridView1.PageIndex == this.GridView1.PageCount - 1)
            {
                this.LinkButton4.Enabled = false;
                this.LinkButton5.Enabled = false;


            }
            else
            {
                this.LinkButton4.Enabled = true;
                this.LinkButton5.Enabled = true;

            }//判断当前如果没有数据给个提示
            if (ds.Tables["Book"].Rows.Count==0)
            {
                this.Label1.Text = "对不起没有符合的数据";
              

            }
            else { this.Label1.Text = ""; }
        }
        catch
        {
          
        
        }


    }

    protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
    {//当鼠标停在某行上的时候颜色的改变
        if (e.Row.RowType == DataControlRowType.DataRow)//判断当前行是否是数据行
        {
            e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#0099ff'");
            e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c;");

        }
    }


    protected void LinkButton3_Click(object sender, EventArgs e)
    {//根据四个linkbutton的 onclick相同的事件进行判断是触发了那个按扭
        //进行控制分页
        switch (((LinkButton)sender).CommandArgument.ToString())
        {
            case "first":
                GridView1.PageIndex = 0;
                break;
            case "pry":
                GridView1.PageIndex = GridView1.PageIndex - 1;
                break;
            case "next":
                GridView1.PageIndex = GridView1.PageIndex + 1;
                break;
            case "lastpage":
                GridView1.PageIndex = GridView1.PageCount - 1;
                break;



        }
        BookBinder();//重新绑定数据

    }
}