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Extend Repeater to support DataPager

, 21 Oct 2011 CPOL
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How to extend Repeater to support DataPager.

Introduction

I have seen some examples of making a Repeater to work with a DataPager like it does with the ListView control. But all examples failed when I tried them, and I spent some time to get this to work. Here is my solution.

Using the code

First, create a Custom Web Control with the name DataPagerRepeater. Inherit it from Repeater and include the System.Web.UI.WebControls.IPageableItemContainer namespace (this requires that you add a reference to System.Web.Extensions).

Add this code:

[ToolboxData("<{0}:DataPagerRepeater runat="server" 
   PersistentDataSource=true></{0}:DataPagerRepeater>")]

public class DataPagerRepeater : Repeater, 
       System.Web.UI.WebControls.IPageableItemContainer, INamingContainer
{

    public int MaximumRows { get { return ViewState["_maximumRows"] != null ? 
                                 (int)ViewState["_maximumRows"] : -1; } }
    public int StartRowIndex { get { return ViewState["_startRowIndex"] != null ? 
                              (int)ViewState["_startRowIndex"] : -1; } }
    public int TotalRows { get { return ViewState["_totalRows"] != null ? 
                               (int)ViewState["_totalRows"] : -1; } }

    public bool PersistentDataSource { 
        get { return ViewState["PersistentDataSource"] != null ? 
              (bool)ViewState["PersistentDataSource"] : true; }
        set { ViewState["PersistentDataSource"] = value; }
    }

    protected override void LoadViewState(object savedState)
    {
        base.LoadViewState(savedState);

        if (Page.IsPostBack)
        {
            if (PersistentDataSource && ViewState["DataSource"] != null)
            {
                this.DataSource = ViewState["DataSource"];
                this.DataBind();
            }
        }
    } 

    public void SetPageProperties(int startRowIndex, int maximumRows, bool databind)
    {
        ViewState["_startRowIndex"] = startRowIndex;
        ViewState["_maximumRows"] = maximumRows;

        if (TotalRows > -1)
        {
            if (TotalRowCountAvailable != null)
            {
                TotalRowCountAvailable(this, 
                   new PageEventArgs((int)ViewState["_startRowIndex"], 
                   (int)ViewState["_maximumRows"], TotalRows));
            }
        }
    }

    protected override void OnDataPropertyChanged()
    { 
        if (MaximumRows != -1)
        {
            this.RequiresDataBinding = true;
        }
        else
            base.OnDataPropertyChanged();
    }

    protected override void RenderChildren(HtmlTextWriter writer)
    {
        if (MaximumRows != -1)
        {
            foreach (RepeaterItem item in this.Items)
            {
                if (item.ItemType == ListItemType.Item || 
                    item.ItemType == ListItemType.AlternatingItem)
                {
                    item.Visible = false;

                    if (item.ItemIndex >= (int)ViewState["_startRowIndex"] && 
                        item.ItemIndex <= ((int)ViewState["_startRowIndex"] + 
                          (int)ViewState["_maximumRows"]))
                    {
                        item.Visible = true;
                    }
                }
                else
                {
                    item.Visible = true;
                }
            }
        }
        base.RenderChildren(writer);
    }

    public override void DataBind()
    { 
        base.DataBind();

        if (MaximumRows != -1)
        {
            int i = 0;
            foreach (object o in GetData())
            {
                i++;
            }
            ViewState["_totalRows"] = i;

            if(PersistentDataSource)
                ViewState["DataSource"] = this.DataSource;
            SetPageProperties(StartRowIndex, MaximumRows, true);
        }
    }

    protected override System.Collections.IEnumerable GetData()
    {
        return base.GetData();
    }

    public event System.EventHandler<PageEventArgs> TotalRowCountAvailable;
}

Build and use like this in an ASP.NET Form:

<cc1:DataPagerRepeater ID="rep1" 
    runat="server" PersistentDataSource="true"> 
<HeaderTemplate > <div></HeaderTemplate> 
<ItemTemplate> 
 <div >
 <%# Eval("Value") %>
 </div>
 </ItemTemplate> 
<FooterTemplate></div></FooterTemplate> 
</cc1:DataPagerRepeater> 

<asp:DataPager ID="DataPager1" 
  PagedControlID="rep1" PageSize="2" runat="server">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" 
   ShowNextPageButton="False" ShowPreviousPageButton="False" />

<asp:NumericPagerField />
<asp:NextPreviousPagerField ButtonType="Button" ShowLastPageButton="True" 
        ShowNextPageButton="False" ShowPreviousPageButton="False" />
</Fields>

</asp:DataPager>

And in the code-behind:

protected void Page_Load(object sender, EventArgs e) 
{
    if(!IsPostBack)
    {
        System.Collections.SortedList SL = new System.Collections.SortedList();

        SL.Add("val1","Text1");
        SL.Add("val2","Text2");
        SL.Add("val3","Text3");
        SL.Add("val4","Text4");
        SL.Add("val5","Text5");
        SL.Add("val6","Text6");
        SL.Add("val7","Text7");
        SL.Add("val8","Text8");
        SL.Add("val9","Text9");

        rep1.DataSource = SL;
        rep1.DataBind();
    } 
}

That's all!

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Mr Orange
Software Developer (Senior) Sigma IT & Management
Sweden Sweden
Working with web application development since 1999.
Developer of the CMS product Publech (www.publech.com) and a large range of other Publech modules.

Involved in developing the largest non commercial website in Sweden the Swedish Public Employment Service (www.ams.se)

Comments and Discussions

 
QuestionBug Fix? Pin
Steve M Anderson at 1-Oct-13 7:41
memberSteve M Anderson1-Oct-13 7:41 
SuggestionGuide when not using presistentDataSource or when using datasource paging Pin
Mr Orange at 25-Jun-13 5:06
memberMr Orange25-Jun-13 5:06 
Questionits working very well but taking too much time server Pin
navnit.88 at 25-Jun-13 1:12
membernavnit.8825-Jun-13 1:12 
AnswerRe: its working very well but taking too much time server Pin
Mr Orange at 25-Jun-13 2:30
memberMr Orange25-Jun-13 2:30 
GeneralRe: its working very well but taking too much time server Pin
navnit.88 at 25-Jun-13 2:51
membernavnit.8825-Jun-13 2:51 
GeneralRe: its working very well but taking too much time server Pin
Mr Orange at 25-Jun-13 3:47
memberMr Orange25-Jun-13 3:47 
GeneralRe: its working very well but taking too much time server Pin
navnit.88 at 25-Jun-13 3:59
membernavnit.8825-Jun-13 3:59 
GeneralRe: its working very well but taking too much time server Pin
Mr Orange at 25-Jun-13 4:49
memberMr Orange25-Jun-13 4:49 
GeneralRe: its working very well but taking too much time server Pin
navnit.88 at 25-Jun-13 19:00
membernavnit.8825-Jun-13 19:00 
GeneralRe: its working very well but taking too much time server Pin
Mr Orange at 25-Jun-13 4:30
memberMr Orange25-Jun-13 4:30 
QuestionHierarchy repeater Pin
Tyng at 17-Jan-13 13:12
memberTyng17-Jan-13 13:12 
BugI think, logic is not valid. Pin
Mikhail Polyakov at 7-Sep-12 1:37
memberMikhail Polyakov7-Sep-12 1:37 
GeneralRe: I think, logic is not valid. Pin
Mr Orange at 25-Jun-13 2:37
memberMr Orange25-Jun-13 2:37 
Questioni can not use it Pin
sara zo at 18-Aug-12 0:21
membersara zo18-Aug-12 0:21 
AnswerRe: i can not use it Pin
Mr Orange at 21-Aug-12 5:06
memberMr Orange21-Aug-12 5:06 
GeneralMy vote of 4 Pin
kiran dangar at 21-Oct-11 20:03
memberkiran dangar21-Oct-11 20:03 
QuestionSqlDataReader Pin
SkillZ91 at 19-Oct-11 6:51
memberSkillZ9119-Oct-11 6:51 
AnswerRe: SqlDataReader Pin
Mr Orange at 23-Oct-11 21:57
memberMr Orange23-Oct-11 21:57 
Generalone step behind Pin
Member 7785733 at 24-May-11 1:19
memberMember 778573324-May-11 1:19 
GeneralRe: one step behind Pin
Mr Orange at 26-May-11 21:54
memberMr Orange26-May-11 21:54 
GeneralFantastic work Pin
kcabrams at 22-Sep-10 9:44
memberkcabrams22-Sep-10 9:44 
QuestionPagingInDataSource Issue Pin
ChadBoettcher at 29-Jun-10 15:15
memberChadBoettcher29-Jun-10 15:15 
AnswerRe: PagingInDataSource Issue Pin
ChadBoettcher at 26-Jul-10 18:52
memberChadBoettcher26-Jul-10 18:52 
GeneralDataPagerRepeater inside UpdatePanel Pin
ran9 at 7-Jun-10 11:49
memberran97-Jun-10 11:49 
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
Mr Orange at 7-Jun-10 22:47
memberMr Orange7-Jun-10 22:47 
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
ran9 at 8-Jun-10 10:40
memberran98-Jun-10 10:40 
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
Mr Orange at 8-Jun-10 22:30
memberMr Orange8-Jun-10 22:30 
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
ran9 at 14-Jun-10 8:26
memberran914-Jun-10 8:26 
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
ran9 at 14-Jun-10 8:29
memberran914-Jun-10 8:29 
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
ran9 at 5-Jul-10 11:31
memberran95-Jul-10 11:31 
GeneralMy vote of 1 Pin
Sebastien Lorion at 27-May-10 6:56
memberSebastien Lorion27-May-10 6:56 
GeneralSome changes new version Pin
Mr Orange at 7-Apr-10 7:11
memberMr Orange7-Apr-10 7:11 
GeneralRe: Some changes new version Pin
Mr Orange at 7-Apr-10 7:38
memberMr Orange7-Apr-10 7:38 
QuestionBug? [modified] Pin
ran9 at 20-Mar-10 12:56
memberran920-Mar-10 12:56 
AnswerRe: Bug? [modified] Pin
xatazch at 6-Apr-10 2:22
memberxatazch6-Apr-10 2:22 
GeneralRe: Bug? Pin
ran9 at 6-Apr-10 9:29
memberran96-Apr-10 9:29 
GeneralRe: Bug? Pin
Mr Orange at 7-Apr-10 7:12
memberMr Orange7-Apr-10 7:12 
GeneralRe: Bug? Pin
xatazch at 9-Apr-10 1:32
memberxatazch9-Apr-10 1:32 
GeneralRe: Bug? Pin
Mr Orange at 21-Apr-10 6:50
memberMr Orange21-Apr-10 6:50 
GeneralRe: Bug? Pin
ran9 at 6-Jun-10 10:47
memberran96-Jun-10 10:47 
GeneralOne bug Pin
badalpatel95 at 18-Mar-10 18:58
memberbadalpatel9518-Mar-10 18:58 
GeneralRe: One bug Pin
Mr Orange at 7-Apr-10 7:15
memberMr Orange7-Apr-10 7:15 
GeneralThanks Pin
Niladri_Biswas at 8-Feb-10 1:10
memberNiladri_Biswas8-Feb-10 1:10 
Generalin VB. Pin
B-One at 19-Jan-10 23:17
memberB-One19-Jan-10 23:17 
GeneralRe: in VB. Pin
B-One at 20-Jan-10 1:41
memberB-One20-Jan-10 1:41 

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