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!
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)