DataList分页的一般方法

 看了网上一些关于DataList分页的列子,有很多分页方法,主要有利用PageDataSource类,存储过程分页,还有就是利用DataSet进行分页,其实是利用SqlDataAdapter的Fill方法,下面我就用DataSet 就行分页与大家分享(其实也是网上看来的,然后加上自己的理解,多了一点点功能,呵呵)

.cs文件如下:

 

public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["gomayConnectionString"].ConnectionString;
    int pageSize, pageCount, recordCount, currentPage;
    protected void Page_Load(object sender, EventArgs e)
    ...{
        pageSize = 10;
        if (!IsPostBack)
        ...{
            ListBind();//绑定DataList
            currentPage = 0;//首页索引为0
            ViewState["pageIndex"] = 0;//保存页索引
            //总记录数
            recordCount = CalculateRecord();
            lblRecordCount.Text ="总记录数:"+ recordCount.ToString();
            //总页数
            pageCount = recordCount / pageSize;//取整
            if (recordCount % pageSize > 0) //总记录数不是 页大小的 整数倍
            ...{
                pageCount = pageCount + 1;
            }
            ViewState["pageCount"] = pageCount; //保存页数
            lblPageCount.Text = "页数:" + pageCount.ToString();
            Label2.Text = (currentPage + 1) + "/" + pageCount.ToString();


        }
        btnGo.Attributes.Add("onclick", " return validate()");
    }
    //计算记录总数
    public int  CalculateRecord() 
    ...{

        int intCount;
        string strCount = "select count(*) as co from quote";
        SqlConnection con = new SqlConnection(connectionString);
        SqlCommand cmd = new SqlCommand(strCount, con);
        con.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        ...{
            intCount = int.Parse(dr["co"].ToString());
        }
        else
        ...{
            intCount = 0;

        }
        dr.Close();
        return intCount;
        con.Close();


    }
    //创建数据源
    ICollection CreateSource()
    ...{
        SqlConnection con=new SqlConnection(connectionString);
        int startIndex;
        startIndex = currentPage * pageSize; //某页的第一条记录索引
        string strSel = "select * from quote";
        DataSet ds = new DataSet();
        SqlDataAdapter da=new SqlDataAdapter(strSel,con);
        
        da.Fill(ds, startIndex, pageSize, "quote");//取一张页面的记录数
        return ds.Tables["quote"].DefaultView;
    }
    public void ListBind()
    ...{

        DataList1.DataSource = CreateSource();
        DataList1.DataBind();
        lbnNextPage.Enabled = true;
        lbnPrevPage.Enabled = true;
        if (currentPage == pageCount - 1)
        ...{
            lbnNextPage.Enabled = false;
        }
        if (currentPage == 0)
        ...{
            lbnPrevPage.Enabled = false;
        }

    }
    //上一页 下一页
    protected void Page_OnClick(object sender, CommandEventArgs e)
    ...{
        currentPage = (int)ViewState["pageIndex"];
        pageCount = (int)ViewState["pageCount"];
        string cmd = e.CommandName;
        switch (cmd)
        ...{ 
            case "Next":
                if (currentPage < pageCount - 1) currentPage++;
                //Label2.Text = (currentPage+1) + "/" + pageCount.ToString();
                break;
            case "Prev":
                if (currentPage > 0) currentPage--;
                //Label2.Text = (currentPage+1) + "/" + pageCount.ToString();
                break;
            case "First":
                currentPage = 0;
                break;
            case"Last":
                currentPage = pageCount - 1;
                break;


        }
        Label2.Text = (currentPage + 1) + "/" + pageCount.ToString();

        ViewState["pageIndex"] = currentPage;
        ListBind();

    }
    //跳转页
    protected void btnGo_Click(object sender, EventArgs e)
    ...{
        int intPage=Convert.ToInt32(txtPage.Text);
        //currentPage = intPage-1;
        pageCount = (int)ViewState["pageCount"];
        if (intPage > pageCount) //如果输入的页数大于总页数
        ...{
            currentPage = pageCount - 1;
        }
        else if (intPage <=0)
        ...{
            currentPage = 0;
        }
        else
        ...{
            currentPage = intPage - 1;
        }

        Label2.Text = (currentPage + 1) + "/" + pageCount.ToString();
      
        ListBind();
        
    }

aspx 文件如下:

 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataList.aspx.cs" Inherits="test_DataList" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>021DataList</title>

</HEAD>
<body>
<script type="text/javascript">
function validate()
...{
    if (document.getElementById("txtPage").value=="")
        ...{
            alert('不能为空!');
            document.getElementById("txtPage").focus();
            return false;
         }
    
         
        var digits="0123456789";
        var temp;
        for(i=0;document.getElementById("txtPage").value.length;i++)
            ...{
                temp=document.getElementById("txtPage").value.substring(i,i+1);
                if (digits.indexOf(temp)==-1)
                    ...{
                    alert("只能输入数字!");
                    document.getElementById("txtPage").focus();
                    return false;
            
                    }
                     return true;
            }
           
      
    return true;
}


   

</script>
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
    <asp:DataList ID="DataList1" runat="server">
        <ItemTemplate>
            <asp:Label ID="Label1" runat="server" Text='<%# Eval("printname") %>'></asp:Label>
        </ItemTemplate>
    </asp:DataList>
    <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label></FONT><asp:LinkButton ID="lbnPrevPage" runat="server" CommandName="Prev" OnCommand="Page_OnClick">上一页</asp:LinkButton>
    <asp:LinkButton ID="lbnNextPage" runat="server" CommandName="Next" OnCommand="Page_OnClick">下一页</asp:LinkButton>
    <asp:Label ID="lblRecordCount" runat="server" Text="Label"></asp:Label>
    <asp:Label ID="lblPageCount" runat="server" Text="Label"></asp:Label>
    <asp:LinkButton ID="lbnFirstPage" runat="server" CommandName="First" OnCommand="Page_OnClick">首页</asp:LinkButton>
    <asp:LinkButton ID="lbnLastPage" runat="server" CommandName="Last" OnCommand="Page_OnClick" Width="33px">末页</asp:LinkButton>
    跳转到<asp:TextBox ID="txtPage" runat="server" Width="30px"></asp:TextBox>页
    <asp:Button ID="btnGo" runat="server" Text="Go" OnClick="btnGo_Click"   />
</form>
</body>
</HTML>