index.aspx.cs

基于C#语言的一个企业客户管理数据库系统开发案例的源代码 ,很实用

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;

public partial class Index : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["flag"] == null)
        {
            Response.Write("../Login.aspx");
        }
        if (!IsPostBack)
        {
            //使用正则表达式限定在ID属性为txtGoto的TextBox控件中只能输入数字
            txtGoto.Attributes["onkeyup"] = "value=value.replace(/[^\\d]/g,'')";
            this.bind();
        }
    }
    public void bind()
    {
        int CurrentPage = Convert.ToInt32(labNowPage.Text);
        PagedDataSource ps = new PagedDataSource();//生成PagedDataSource的实例
        DataSet ds = Operation.ReDataSet("ShowRecords");//调用ReDataSet方法返回DataSet对象
        ps.DataSource = ds.Tables["Records"].DefaultView;
        ps.AllowPaging = true; //是否可以分页
        ps.PageSize = 4; //显示的数量
        ps.CurrentPageIndex = CurrentPage - 1; //取得当前页的页码
        lnkbtnFront.Enabled = true;
        lnkbtnFirst.Enabled = true;
        lnkbtnNext.Enabled = true;
        lnkbtnLast.Enabled = true;
        if (CurrentPage == 1)
        {
            lnkbtnFirst.Enabled = false;//不显示第一页按钮
            lnkbtnFront.Enabled = false;//不显示上一页按钮
        }
        if (CurrentPage == ps.PageCount)
        {
            lnkbtnNext.Enabled = false;//不显示下一页
            lnkbtnLast.Enabled = false;//不显示最后一页

        }
        this.labCount.Text = Convert.ToString(ps.PageCount);
        this.DataList1.DataSource = ps;
        this.DataList1.DataKeyField = "RecordID";
        this.DataList1.DataBind();
    }
    protected void lnkbtnTop_Click(object sender, EventArgs e)
    {
        this.labNowPage.Text = "1";
        this.bind();
    }
    //上一页
    protected void lnkbtnPrve_Click(object sender, EventArgs e)
    {
        this.labNowPage.Text = Convert.ToString(Convert.ToInt32(this.labNowPage.Text) - 1);
        this.bind();
    }
    //下一页
    protected void lnkbtnNext_Click(object sender, EventArgs e)
    {
        this.labNowPage.Text = Convert.ToString(Convert.ToInt32(this.labNowPage.Text) + 1);
        this.bind();
    }
    //尾页
    protected void lnkbtnLast_Click(object sender, EventArgs e)
    {
        this.labNowPage.Text = this.labCount.Text;
        this.bind();
    }
    //直接跳转
    protected void btnGo_Click(object sender, EventArgs e)
    {
        /* ************************************************************************************************************ */
        /* 在程序后期测试中，为了增强代码的健壮性，对以下代码进行完善，与书中给出的代码段不完全一致，代码实现的功能不变 */
        /* ************************************************************************************************************ */
        int count;
        if (this.txtGoto.Text== "")
        {
            count = 1;
        }
        else
        {
            count = Convert.ToInt32(this.txtGoto.Text.Trim());
        }
        int all = Convert.ToInt32(this.labCount.Text);
        if ((all < count) || (count < 1))
        {
            Response.Write("<script>alert('当前页不存在');location='Index.aspx'</script>");
        }
        else
        {
            this.labNowPage.Text =count.ToString ();
            this.bind();
        }
    }
    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        int RecordID = Convert.ToInt32(DataList1.DataKeys[e.Item.ItemIndex]);
        Response.Redirect("RecordDetails.aspx?RecordID=" + RecordID + "");
    }
}