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Extend Repeater to support DataPager

, 21 Oct 2011 CPOL 72.4K 2.3K 19
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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 Anderson1-Oct-13 7:41
memberSteve M Anderson1-Oct-13 7:41 
SuggestionGuide when not using presistentDataSource or when using datasource paging Pin
Mr Orange25-Jun-13 5:06
memberMr Orange25-Jun-13 5:06 
Questionits working very well but taking too much time server Pin
navnit.8825-Jun-13 1:12
membernavnit.8825-Jun-13 1:12 
AnswerRe: its working very well but taking too much time server Pin
Mr Orange25-Jun-13 2:30
memberMr Orange25-Jun-13 2:30 
GeneralRe: its working very well but taking too much time server Pin
navnit.8825-Jun-13 2:51
membernavnit.8825-Jun-13 2:51 
GeneralRe: its working very well but taking too much time server Pin
Mr Orange25-Jun-13 3:47
memberMr Orange25-Jun-13 3:47 
GeneralRe: its working very well but taking too much time server Pin
navnit.8825-Jun-13 3:59
membernavnit.8825-Jun-13 3:59 
GeneralRe: its working very well but taking too much time server Pin
Mr Orange25-Jun-13 4:49
memberMr Orange25-Jun-13 4:49 
GeneralRe: its working very well but taking too much time server Pin
navnit.8825-Jun-13 19:00
membernavnit.8825-Jun-13 19:00 
GeneralRe: its working very well but taking too much time server Pin
Mr Orange25-Jun-13 4:30
memberMr Orange25-Jun-13 4:30 
QuestionHierarchy repeater Pin
Tyng17-Jan-13 13:12
memberTyng17-Jan-13 13:12 
BugI think, logic is not valid. Pin
Mikhail Polyakov7-Sep-12 1:37
memberMikhail Polyakov7-Sep-12 1:37 
GeneralRe: I think, logic is not valid. Pin
Mr Orange25-Jun-13 2:37
memberMr Orange25-Jun-13 2:37 
Questioni can not use it Pin
sara zo18-Aug-12 0:21
membersara zo18-Aug-12 0:21 
AnswerRe: i can not use it Pin
Mr Orange21-Aug-12 5:06
memberMr Orange21-Aug-12 5:06 
GeneralMy vote of 4 Pin
kiran dangar21-Oct-11 20:03
memberkiran dangar21-Oct-11 20:03 
QuestionSqlDataReader Pin
SkillZ9119-Oct-11 6:51
memberSkillZ9119-Oct-11 6:51 
AnswerRe: SqlDataReader Pin
Mr Orange23-Oct-11 21:57
memberMr Orange23-Oct-11 21:57 
Generalone step behind Pin
Member 778573324-May-11 1:19
memberMember 778573324-May-11 1:19 
GeneralRe: one step behind Pin
Mr Orange26-May-11 21:54
memberMr Orange26-May-11 21:54 
GeneralFantastic work Pin
kcabrams22-Sep-10 9:44
memberkcabrams22-Sep-10 9:44 
QuestionPagingInDataSource Issue Pin
ChadBoettcher29-Jun-10 15:15
memberChadBoettcher29-Jun-10 15:15 
AnswerRe: PagingInDataSource Issue Pin
ChadBoettcher26-Jul-10 18:52
memberChadBoettcher26-Jul-10 18:52 
GeneralDataPagerRepeater inside UpdatePanel Pin
ran97-Jun-10 11:49
memberran97-Jun-10 11:49 
I'm having a problem when using DataPagerRepeater inside an Update Panel.
What happens is that on a button I rebind the repeater to a new data source and calls the update panel update().
The bug is that the repeater isn't update with the new data.
I've traced the databind function and what happens is that on the GetData() function I get the old data and it is not being replaced with the DataSource property.

Can you please fix it?

Thanks.
GeneralRe: DataPagerRepeater inside UpdatePanel Pin
Mr Orange7-Jun-10 22:47
memberMr Orange7-Jun-10 22:47 

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