如何使用下拉列表绑定具有分页的Datalist？

Question

我是asp.net的新手并且有一些线索，但不知道如何做到这一点所以任何帮助都会非常好，谢谢。

我有一个带分页的Datalist如何通过Dropdown列表从用户输入更新datalist，这将绑定我的datalist和分页？

我的私人财产

private int CurrentPage
    {
        get
        {
            object objPage = ViewState["_CurrentPage"];
            int _CurrentPage = 0;
            if (objPage == null)
            {
                _CurrentPage = 0;
            }
            else
            {
                _CurrentPage = (int)objPage;
            }
            return _CurrentPage;
        }
        set { ViewState["_CurrentPage"] = value; }
    }
    private int fistIndex
    {
        get
        {

            int _FirstIndex = 0;
            if (ViewState["_FirstIndex"] == null)
            {
                _FirstIndex = 0;
            }
            else
            {
                _FirstIndex = Convert.ToInt32(ViewState["_FirstIndex"]);
            }
            return _FirstIndex;
        }
        set { ViewState["_FirstIndex"] = value; }
    }
    private int lastIndex
    {
        get
        {

            int _LastIndex = 0;
            if (ViewState["_LastIndex"] == null)
            {
                _LastIndex = 0;
            }
            else
            {
                _LastIndex = Convert.ToInt32(ViewState["_LastIndex"]);
            }
            return _LastIndex;
        }
        set { ViewState["_LastIndex"] = value; }
    }

私人方法

private void BindItemsList()
    {

        DataTable dataTable = dm.GetDataTable().Tables["product"];// middle tier which pulls data from a database
        _PageDataSource.DataSource = dataTable.DefaultView;
        _PageDataSource.AllowPaging = true;
        _PageDataSource.PageSize = 1;
        _PageDataSource.CurrentPageIndex = CurrentPage;
        ViewState["TotalPages"] = _PageDataSource.PageCount;

        this.lblPageInfo.Text = "Page " + (CurrentPage + 1) + " of " + _PageDataSource.PageCount;
        this.lbtnPrevious.Enabled = !_PageDataSource.IsFirstPage;
        this.lbtnNext.Enabled = !_PageDataSource.IsLastPage;
        this.lbtnFirst.Enabled = !_PageDataSource.IsFirstPage;
        this.lbtnLast.Enabled = !_PageDataSource.IsLastPage;

        this.dlPhones.DataSource = _PageDataSource;
        this.dlPhones.DataBind();
        this.doPaging();
    }

    /// <summary>
    /// Binding Paging List
    /// </summary>
    private void doPaging()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("PageIndex");
        dt.Columns.Add("PageText");

        fistIndex = CurrentPage - 5;


        if (CurrentPage > 5)
        {
            lastIndex = CurrentPage + 5;
        }
        else
        {
            lastIndex = 10;
        }
        if (lastIndex > Convert.ToInt32(ViewState["TotalPages"]))
        {
            lastIndex = Convert.ToInt32(ViewState["TotalPages"]);
            fistIndex = lastIndex - 10;
        }

        if (fistIndex < 0)
        {
            fistIndex = 0;
        }

        for (int i = fistIndex; i < lastIndex; i++)
        {
            DataRow dr = dt.NewRow();
            dr[0] = i;
            dr[1] = i + 1;
            dt.Rows.Add(dr);
        }

        this.dlPaging.DataSource = dt;
        this.dlPaging.DataBind();
    }

代码隐藏页面代码

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.BindItemsList();
        }
    }//end of page load
    protected void lbtnNext_Click(object sender, EventArgs e)
    {

        CurrentPage += 1;
        this.BindItemsList();

    }
    protected void lbtnPrevious_Click(object sender, EventArgs e)
    {
        CurrentPage -= 1;
        this.BindItemsList();

    }
    protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName.Equals("Paging"))
        {
            CurrentPage = Convert.ToInt16(e.CommandArgument.ToString());
            this.BindItemsList();
        }
    }
    protected void dlPaging_ItemDataBound(object sender, DataListItemEventArgs e)
    {
        LinkButton lnkbtnPage = (LinkButton)e.Item.FindControl("lnkbtnPaging");
        if (lnkbtnPage.CommandArgument.ToString() == CurrentPage.ToString())
        {
            lnkbtnPage.Enabled = false;
            lnkbtnPage.Style.Add("fone-size", "14px");
            lnkbtnPage.Font.Bold = true;

        }
    }
    protected void lbtnLast_Click(object sender, EventArgs e)
    {

        CurrentPage = (Convert.ToInt32(ViewState["TotalPages"]) - 1);
        this.BindItemsList();

    }
    protected void lbtnFirst_Click(object sender, EventArgs e)
    {

        CurrentPage = 0;
        this.BindItemsList();


    }

asp.net首页

<asp:Label ID="lblSearch" runat="server" Text="Search By Phone"></asp:Label>
                <asp:DropDownList ID="ddlCat" runat="server">
                    <asp:ListItem>Nokia</asp:ListItem>
                    <asp:ListItem>Samsung</asp:ListItem>
                    <asp:ListItem>Motorola</asp:ListItem>
                    <asp:ListItem>Sony</asp:ListItem>
                    <asp:ListItem>Ericsson</asp:ListItem>
                    <asp:ListItem>Sony</asp:ListItem>
                    <asp:ListItem>LG</asp:ListItem>
                    <asp:ListItem>Apple</asp:ListItem>
                    <asp:ListItem>HTC</asp:ListItem>
                    <asp:ListItem>BlackBerry</asp:ListItem>
                    <asp:ListItem>HP</asp:ListItem>
                    <asp:ListItem>Huawei</asp:ListItem>
                    <asp:ListItem>Acer</asp:ListItem>
                    <asp:ListItem>Asus</asp:ListItem>
                    <asp:ListItem>Dell</asp:ListItem>
                    <asp:ListItem>Alcatel</asp:ListItem>
                    <asp:ListItem>Vodafone</asp:ListItem>
                    <asp:ListItem>T-Mobile</asp:ListItem>
                    <asp:ListItem>Toshiba</asp:ListItem>
                    <asp:ListItem>Gigabyte</asp:ListItem>
                    <asp:ListItem>Pantech</asp:ListItem>
                    <asp:ListItem>ZTE</asp:ListItem>
                    <asp:ListItem>Micromax</asp:ListItem>
                    <asp:ListItem>BLU</asp:ListItem>
                    <asp:ListItem>Spice</asp:ListItem>
                    <asp:ListItem>Icemobile</asp:ListItem>
                    <asp:ListItem>verykool</asp:ListItem>
                    <asp:ListItem>Vertu</asp:ListItem>
                    <asp:ListItem>Celkon</asp:ListItem>
                    <asp:ListItem>NIU</asp:ListItem>
                    <asp:ListItem>Yezz</asp:ListItem>
                    <asp:ListItem>Parla</asp:ListItem>
                    <asp:ListItem>Plum</asp:ListItem>
                    <asp:ListItem>Sim Card</asp:ListItem>
                </asp:DropDownList>
                <asp:DataList ID="dlPhones" runat="server" DataKeyField="PID" RepeatDirection="Horizontal" RepeatColumns="1" CellPadding="10" CellSpacing="10" >
                    <ItemTemplate>           
                        <asp:Label ID="ProductNameLabel" runat="server" Text='<%# Eval("ProductName") %>' />   
                        <br />Price:
                        <asp:Label ID="PriceLabel" runat="server" Text='<%# "$" + Eval("Price") %>'  />
                        <br />

                        <asp:Image ID="Image1" runat="server" CssClass="ImageStyles" ImageUrl='<%# "GetImage.ashx?Id=" + Eval("PID") %>' BackColor="White" BorderStyle="Ridge" BorderColor="WhiteSmoke" />
                        <br />           
                    </ItemTemplate>
                </asp:DataList>                
               <table cellpadding="0" border="0">
                    <tr>
                        <td align="right">
                            <asp:LinkButton ID="lbtnFirst" runat="server" CausesValidation="false" OnClick="lbtnFirst_Click"><img src="images/First.png" height="50px" width="100px" onmouseover="this.src='images/FirstMouseOver.png';" onmouseout="this.src='images/First.png';" /></asp:LinkButton>
                            &nbsp;</td>
                        <td align="right">
                            <asp:LinkButton ID="lbtnPrevious" runat="server" CausesValidation="false" OnClick="lbtnPrevious_Click"><img src="images/Previouse.png" onmouseover="this.src='images/PreviouseMouseOver.png';" onmouseout="this.src='images/Previouse.png';" /></asp:LinkButton>&nbsp;&nbsp;</td>
                        <td align="center" valign="middle">
                            <asp:DataList ID="dlPaging" runat="server" RepeatDirection="Horizontal" OnItemCommand="dlPaging_ItemCommand"
                                OnItemDataBound="dlPaging_ItemDataBound">
                                <ItemTemplate>
                                    <asp:LinkButton ID="lnkbtnPaging" Font-Size="X-Large" runat="server" CommandArgument='<%# Eval("PageIndex") %>'
                                        CommandName="Paging" Text='<%# Eval("PageText") %>'></asp:LinkButton>&nbsp;
                                </ItemTemplate>
                            </asp:DataList>
                        </td>
                        <td align="left">
                            &nbsp;&nbsp;<asp:LinkButton ID="lbtnNext" runat="server" CausesValidation="false"
                                OnClick="lbtnNext_Click"><img src="images/Next.png" onmouseover="this.src='images/NextMouseOver.png';" onmouseout="this.src='images/Next.png';" /></asp:LinkButton></td>
                        <td align="left">
                            &nbsp;
                            <asp:LinkButton ID="lbtnLast" runat="server" CausesValidation="false" OnClick="lbtnLast_Click"><img src="images/Last.png" onmouseover="this.src='images/LastMouseOver.png';" onmouseout="this.src='images/Last.png';" /></asp:LinkButton></td>
                    </tr>
                    <tr>
                        <td colspan="5" align="center" style="height: 30px" valign="middle">
                            <asp:Label ID="lblPageInfo" runat="server"></asp:Label></td>
                    </tr>
                </table>

Answer 1

我自己想出了解决问题的方法，以防任何人遇到同样的问题。

我不确定这是否是最好的方式，所以请原谅我。

1）创建Session["search"] = "First";

2）为dropdownlist onselectindexchange创建一个方法

<asp:DropDownList ID="ddlCat" runat="server" AutoPostBack="true" OnSelectedIndexChanged="itemSelected">

Code behind method

protected void itemSelected(object sender, EventArgs e)
    {
        Session["search"] = "Second";
        RebindItemList();
    }

3）重新绑定方法

private void RebindItemList()
    {
        DataTable dataTable = dm.GetSpecifProduct(ddlCat.SelectedItem.Text).Tables["product"];// middle tier method with returns a Dataset or DataTable up to you.
        _PageDataSource.DataSource = dataTable.DefaultView;
        _PageDataSource.AllowPaging = true;
        _PageDataSource.PageSize = 1;
        _PageDataSource.CurrentPageIndex = CurrentPage;
        ViewState["TotalPages"] = _PageDataSource.PageCount;

        this.lblPageInfo.Text = "Page " + (CurrentPage + 1) + " of " + _PageDataSource.PageCount;
        this.lbtnPrevious.Enabled = !_PageDataSource.IsFirstPage;
        this.lbtnNext.Enabled = !_PageDataSource.IsLastPage;
        this.lbtnFirst.Enabled = !_PageDataSource.IsFirstPage;
        this.lbtnLast.Enabled = !_PageDataSource.IsLastPage;

        this.dlPhones.DataSource = _PageDataSource;
        this.dlPhones.DataBind();
        this.doPaging();
    }

4）分页按钮的逻辑语句

protected void lbtnNext_Click(object sender, EventArgs e)
    {

        CurrentPage += 1;
        string searchCat = (string) Session["search"];
        if (searchCat == "First")
        {
            this.BindItemsList();
        }
        if (searchCat == "Second")
        {
            this.RebindItemList();
        }
    }
    protected void lbtnPrevious_Click(object sender, EventArgs e)
    {
        CurrentPage -= 1;
        string searchCat = (string)Session["search"];
        if (searchCat == "First")
        {
            this.BindItemsList();
        }
        if (searchCat == "Second")
        {
            this.RebindItemList();
        }

    }
    protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName.Equals("Paging"))
        {
            CurrentPage = Convert.ToInt16(e.CommandArgument.ToString());
            string searchCat = (string)Session["search"];
            if (searchCat == "First")
            {
                this.BindItemsList();
            }
            if (searchCat == "Second")
            {
                this.RebindItemList();
            }
        }
    }
    protected void dlPaging_ItemDataBound(object sender, DataListItemEventArgs e)
    {
        LinkButton lnkbtnPage = (LinkButton)e.Item.FindControl("lnkbtnPaging");
        if (lnkbtnPage.CommandArgument.ToString() == CurrentPage.ToString())
        {
            lnkbtnPage.Enabled = false;
            lnkbtnPage.Style.Add("fone-size", "14px");
            lnkbtnPage.Font.Bold = true;

        }
    }
    protected void lbtnLast_Click(object sender, EventArgs e)
    {

        CurrentPage = (Convert.ToInt32(ViewState["TotalPages"]) - 1);
        string searchCat = (string)Session["search"];
        if (searchCat == "First")
        {
            this.BindItemsList();
        }
        if (searchCat == "Second")
        {
            this.RebindItemList();
        }

    }
    protected void lbtnFirst_Click(object sender, EventArgs e)
    {

        CurrentPage = 0;
        string searchCat = (string)Session["search"];
        if (searchCat == "First")
        {
            this.BindItemsList();
        }
        if (searchCat == "Second")
        {
            this.RebindItemList();
        }


    }