【2017-5-24】WebForm 分页功能

实体类

    public int ids { get; set; }
    public string code { get; set; }
    public string name { get; set; }
    public decimal oil { get; set; }
    public decimal price { get; set; }

封装类

注意引用using System.Data.SqlClient;

SqlConnection conn = null;
    SqlCommand cmd = null;

    public carData()
    {
        conn = new SqlConnection("server=.;database=One;user=sa;pwd=123");
        cmd = conn.CreateCommand();
    }

    //查询全部
    public List<car> SelectAll()
    {
        List<car> clist = new List<car>();
        cmd.CommandText = "select * from car";
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.HasRows)
        {
            while (dr.Read())
            {
                car c = new car();
                c.ids = Convert.ToInt32(dr["ids"]);
                c.code = dr["code"].ToString();
                c.name = dr["name"].ToString();
                c.oil = Convert.ToDecimal(dr["oil"]);
                c.price = Convert.ToDecimal(dr["price"]);
                clist.Add(c);
            }
        }
        conn.Close();
        return clist;
    }

    //分页查询
    public List<car> SelectAll(int count, int number)
    {
        List<car> clist = new List<car>();
        cmd.CommandText = "select top " + count + " * from car where ids not in(select top " + (count * (number - 1)) + " ids from car)";
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.HasRows)
        {
            while (dr.Read())
            {
                car c = new car();
                c.ids = Convert.ToInt32(dr["ids"]);
                c.code = dr["code"].ToString();
                c.name = dr["name"].ToString();
                c.oil = Convert.ToDecimal(dr["oil"]);
                c.price = Convert.ToDecimal(dr["price"]);
                clist.Add(c);
            }
        }
        conn.Close();
        return clist;
    }

    //查询数据条数
    public int SelectCount()
    {
        int a = 0;
        cmd.CommandText = "select count(*) from car";
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        dr.Read();
        a = Convert.ToInt32(dr[0]);
        conn.Close();
        return a;
    }

    //条件查询
    public List<car> SelectAll(string tsql, Hashtable hs)
    {
        List<car> clist = new List<car>();
        cmd.CommandText = tsql;
        cmd.Parameters.Clear();
        foreach(string h in hs.Keys)
        {
        cmd.Parameters.AddWithValue(h,hs[h]);
        }
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        if (dr.HasRows)
        {
            while (dr.Read())
            {
                car c = new car();
                c.ids = Convert.ToInt32(dr["ids"]);
                c.code = dr["code"].ToString();
                c.name = dr["name"].ToString();
                c.oil = Convert.ToDecimal(dr["oil"]);
                c.price = Convert.ToDecimal(dr["price"]);
                clist.Add(c);
            }
        }
        conn.Close();
        return clist;
    }

前端

<table style="width: 100%; background-color: #0094ff; text-align: center;">
            <tr>
                <td>Ids</td>
                <td>编号</td>
                <td>名称</td>
                <td>油耗</td>
                <td>价格</td>
            </tr>

            <asp:Repeater ID="Repeater1" runat="server">
                <ItemTemplate>
                    <tr style="background-color: #fff;">
                        <td><%#Eval("ids") %></td>
                        <td><%#Eval("code") %></td>
                        <td><%#Eval("name") %></td>
                        <td><%#Eval("oil") %></td>
                        <td><%#Eval("price") %></td>
                    </tr>
                </ItemTemplate>
            </asp:Repeater>
        </table>
        <br />

        当前第【<asp:Label ID="Label1" runat="server" Text="1"></asp:Label>】页&nbsp;&nbsp;&nbsp;&nbsp;
        共【<asp:Label ID="Label2" runat="server" Text="1"></asp:Label>】页&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button1" runat="server" Text="首页" />&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button2" runat="server" Text="上一页" />&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button3" runat="server" Text="下一页" />&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button4" runat="server" Text="尾页" />&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList><asp:Button ID="Button5" runat="server" Text="跳转" />

后台

int count = 5;//每页显示条数
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Repeater1.DataSource = new carData().SelectAll(count, 1);
            Repeater1.DataBind();
            Label2.Text = MaxPageNumber().ToString();
            for (int i = 1; i <= MaxPageNumber(); i++)
            {
                ListItem li = new ListItem(i.ToString(),i.ToString());
                DropDownList1.Items.Add(li);
            }
        }
        //改变按钮是否可用状态
        if (Label1.Text == "1")
        {
            Button1.Enabled = false;
            Button2.Enabled = false;
        }
        if (Label1.Text != "1")
        {
            Button1.Enabled = true;
            Button2.Enabled = true;
        }
        if (Label1.Text == MaxPageNumber().ToString())
        {
            Button3.Enabled = false;
            Button4.Enabled = false;
        }
        if (Label1.Text != MaxPageNumber().ToString())
        {
            Button3.Enabled = true;
            Button4.Enabled = true;
        }
        //按钮点击事件
        Button4.Click += Button4_Click;
        Button3.Click += Button3_Click;
        Button2.Click += Button2_Click;
        Button1.Click += Button1_Click;
        Button5.Click += Button5_Click;
    }

    //跳转
    void Button5_Click(object sender, EventArgs e)
    {
        int a = Convert.ToInt32(DropDownList1.SelectedValue);
        //将下一页数据绑定到
        Repeater1.DataSource = new carData().SelectAll(count, a);
        Repeater1.DataBind();

        //将当前显示的页数改变到页面上去
        Label1.Text = a.ToString();
        //改变按钮是否可用状态
        if (Label1.Text == "1")
        {
            Button1.Enabled = false;
            Button2.Enabled = false;
        }
        if (Label1.Text != "1")
        {
            Button1.Enabled = true;
            Button2.Enabled = true;
        }
        if (Label1.Text == MaxPageNumber().ToString())
        {
            Button3.Enabled = false;
            Button4.Enabled = false;
        }
        if (Label1.Text != MaxPageNumber().ToString())
        {
            Button3.Enabled = true;
            Button4.Enabled = true;
        }
    }

    //首页
    void Button1_Click(object sender, EventArgs e)
    {
        //将下一页数据绑定
        Repeater1.DataSource = new carData().SelectAll(count, 1);
        Repeater1.DataBind();

        //将当前显示的页数改变
        Label1.Text = "1";
        //改变按钮是否可用状态
        if (Label1.Text == "1")
        {
            Button1.Enabled = false;
            Button2.Enabled = false;
        }
        else
        {
            Button1.Enabled = true;
            Button2.Enabled = true;
        }
    }

    //上一页
    void Button2_Click(object sender, EventArgs e)
    {
        //获取当前页数，计算上一页页数
        int NextNumber = Convert.ToInt32(Label1.Text) - 1;
        if (NextNumber < 1)
        { return; }
        //将上一页数据绑定
        Repeater1.DataSource = new carData().SelectAll(count, NextNumber);
        Repeater1.DataBind();

        //将当前显示的页数改变
        Label1.Text = NextNumber.ToString();
        //改变按钮是否可用状态
        if (Label1.Text == "1")
        {
            Button1.Enabled = false;
            Button2.Enabled = false;
        }
        else
        {
            Button1.Enabled = true;
            Button2.Enabled = true;
        }
        if (Label1.Text == MaxPageNumber().ToString())
        {
            Button3.Enabled = false;
            Button4.Enabled = false;
        }
        else
        {
            Button3.Enabled = true;
            Button4.Enabled = true;
        }
    }

    //下一页
    void Button3_Click(object sender, EventArgs e)
    {
        //获取当前页数，计算下一页页数
        int NextNumber = Convert.ToInt32(Label1.Text) + 1;
        if (NextNumber > MaxPageNumber())
        { return; }
        //将下一页数据绑定
        Repeater1.DataSource = new carData().SelectAll(count, NextNumber);
        Repeater1.DataBind();

        //将当前显示的页数改变
        Label1.Text = NextNumber.ToString();
        //改变按钮是否可用状态
        if (Label1.Text == MaxPageNumber().ToString())
        {
            Button3.Enabled = false;
            Button4.Enabled = false;
        }
        else
        {
            Button3.Enabled = true;
            Button4.Enabled = true;
        }
        if (Label1.Text == "1")
        {
            Button1.Enabled = false;
            Button2.Enabled = false;
        }
        else
        {
            Button1.Enabled = true;
            Button2.Enabled = true;
        }
    }

    //尾页
    void Button4_Click(object sender, EventArgs e)
    {
        //将下一页数据绑定
        Repeater1.DataSource = new carData().SelectAll(count, MaxPageNumber());
        Repeater1.DataBind();

        //将当前显示的页数改变
        Label1.Text = MaxPageNumber().ToString();
        //改变按钮是否可用状态
        if (Label1.Text == MaxPageNumber().ToString())
        {
            Button3.Enabled = false;
            Button4.Enabled = false;
        }
        else
        {
            Button3.Enabled = true;
            Button4.Enabled = true;
        }
    }

    //取最大页数
    public int MaxPageNumber()
    {
        int a = 0;
        int maxcount = new carData().SelectCount();
        decimal d = Convert.ToDecimal(maxcount) / count;
        a = Convert.ToInt32(Math.Ceiling(d));
        return a;
    }