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Paging ListView With DataPager

, 3 Mar 2008
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How to paging ListView with DataPager Programatically

Introduction

Recently, I receive some e-mail about ListView from colleagues/friends who want to Paging the ListView, but the DataSource must be set programatically. Then, I do some tests and get the result that follows.

Background

Paging the ListView with DataPager is very easy and you can't write some code. Just add and configure a DataSource, add a ListView, set the DataSource to ListView. Add a DataPager and configure it to ListView. Done!

Run app and enjoy it!

But, when the DataSource is set in code, some cautions must be done. Now, to populate the ListView, you must use the DataPager.

Using the code

Let't try. Add a ListView:

<asp:ListView ID="ListViewProducts" runat="server" ItemPlaceholderID="ProductItem">
    <ItemTemplate>
        <div class="Product">
            <strong>
                <asp:Label runat="server" ID="LabelId" Text='<%# Eval("Id") %>'></asp:Label>
                ::
                <asp:Label runat="server" ID="LabelName" Text='<%# Eval("Name") %>'></asp:Label>
            </strong>
            <br />
            <em>
                <asp:Label runat="server" ID="LabelDescription" Text='<%# Eval("Description") %>'></asp:Label>
            </em>
        </div>
    </ItemTemplate>
    <LayoutTemplate>
        <asp:PlaceHolder runat="server" ID="ProductItem"></asp:PlaceHolder>
    </LayoutTemplate>
    <ItemSeparatorTemplate>
        <hr />
    </ItemSeparatorTemplate>
</asp:ListView> 

Then, add the DataPager:

<asp:DataPager ID="DataPagerProducts" runat="server" PagedControlID="ListViewProducts"
    PageSize="3" OnPreRender="DataPagerProducts_PreRender">
    <Fields>
        <asp:NextPreviousPagerField ShowFirstPageButton="True" ShowNextPageButton="False" />
        <asp:NumericPagerField />
        <asp:NextPreviousPagerField ShowLastPageButton="True" ShowPreviousPageButton="False" />
    </Fields>
</asp:DataPager>

See that the event OnPreRender was implemented. It's used to populate the ListView:

protected void DataPagerProducts_PreRender(object sender, EventArgs e)
{
    ProductList db = new ProductList();
    this.ListViewProducts.DataSource = db.GellAll();
    this.ListViewProducts.DataBind();
}

I create two class to help this example:

1) Product: represent a product item;
2) ProductList: represent a database access layer.

ProductClass

using System;

/// <span class="code-SummaryComment"><summary></span>
/// Class that represent a product item.
/// <span class="code-SummaryComment"></summary></span>
public class Product
{
    private int? _Id;
    private string _Name;
    private string _Descrition;

    public Product(){}

    public Product(int Id, string Name, string Description)
    {
        this._Id = Id;
        this._Name = Name;
        this._Descrition = Description;
    }

    /// <span class="code-SummaryComment"><summary></span>
    /// Product Id
    /// <span class="code-SummaryComment"></summary></span>
    public int? Id
    {
        get { return _Id; }
        set { _Id = value; }
    }

    /// <span class="code-SummaryComment"><summary></span>
    /// Product Name
    /// <span class="code-SummaryComment"></summary></span>
    public string Name
    {
        get { return _Name; }
        set { _Name = value; }
    }

    /// <span class="code-SummaryComment"><summary></span>
    /// Product Complete Description
    /// <span class="code-SummaryComment"></summary></span>
    public string Description
    {
        get { return _Descrition; }
        set { _Descrition = value; }
    }
}

ProductList Class

using System;
using System.Collections.Generic;

/// <span class="code-SummaryComment"><summary></span>
/// Simulation of a Product Database
/// <span class="code-SummaryComment"></summary></span>
public class ProductList
{
    private IList<Product> _ProductDB = new List<Product>();

    public ProductList()
    {
        this._ProductDB.Add(new Product(1, "Computer", "Complete hardware with software included."));
        this._ProductDB.Add(new Product(2, "Kitchen Calendar", "Beautiful caledar for your kitchen."));
        this._ProductDB.Add(new Product(3, "Shoes", "Most advanced anti-impact system in a small shoe."));
        this._ProductDB.Add(new Product(4, "Pen", "What you think, must be written. This pen is your helper."));
        this._ProductDB.Add(new Product(5, "Cell Phone", "Powerfull comunication thing. Today is part of your body. Get one more."));
    }

    public IList<Product> GellAll()
    {
        return this._ProductDB;
    }
} 

Points of Interest

Interesting Articles:

  • http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.datapager.aspx
  • http://aspnet.4guysfromrolla.com/articles/021308-1.aspx
  • http://www.west-wind.com/WebLog/posts/127340.aspx

History

2008-03-03 - First insert.

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

danfcosta
Architect
Brazil Brazil
No Biography provided

Comments and Discussions

 
GeneralMy vote of 5 PinmemberHitesh Web Developer20-Aug-13 23:57 
GeneralMy vote of 5 Pinmemberits_Deebs30-May-13 7:43 
QuestionOne More Solution of DataPager PinmemberMustafaIqbal11-Nov-12 18:40 
GeneralVery good Article PinmemberMohan Patha30-Oct-11 16:52 
GeneralMy vote of 5 PinmemberPatel Tariq Ahmed17-Sep-11 21:46 
GeneralDon't bind the DataPager in PreRender() PinmemberIlya121-Jul-09 4:27 

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