ListViewItemEventArgs, classe (System.Web.UI.WebControls)

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.NET Framework Class Library

ListViewItemEventArgs Class

Provides data for the ItemCreated and ItemDataBound events.

Inheritance Hierarchy

System..::.Object
System..::.EventArgs
System.Web.UI.WebControls..::.ListViewItemEventArgs

Namespace: System.Web.UI.WebControls
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)

Syntax

Visual Basic

Public Class ListViewItemEventArgs _
    Inherits EventArgs

public class ListViewItemEventArgs : EventArgs

Visual C++

public ref class ListViewItemEventArgs : public EventArgs

type ListViewItemEventArgs =  
    class
        inherit EventArgs
    end

The ListViewItemEventArgs type exposes the following members.

Constructors

	Name	Description
	ListViewItemEventArgs	Initializes a new instance of the ListViewItemEventArgs class.

Top

Properties

	Name	Description
	Item	Gets the item that is being created or bound to data.

Top

Methods

	Name	Description
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

Remarks

Before the ListView control can be rendered, a ListViewItem object must be created for each item in the control. The ItemCreated event is raised every time that an item in the ListView control is created. This enables you to provide an event-handling method that performs a custom routine whenever an item is created, such as adding custom content to an item.

Similarly, before the ListView control can be rendered, every item in the control must be bound to a record in the data source. The ItemDataBound event is raised when an item (represented by a ListViewItem object) is bound to data in the ListView control. This enables you to perform a custom routine whenever an item is bound to data, such as modifying the values of the data before they are displayed.

A ListViewItemEventArgs object is passed to the event-handling method, which enables you to access the properties of the item that raised the event. To determine which item type (data item, empty item, or insert item) is being created, use the ItemType property of the ListViewItem object.

For a list of initial property values for an instance of ListViewItemEventArgs, see the ListViewItemEventArgs constructor.

Examples

The following example shows how to use the ListViewItemEventArgs object to access the properties of the item that is being bound to data.

Visual Basic


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Protected Sub ContactsListView_ItemDataBound(ByVal sender As Object, _
                                                 ByVal e As ListViewItemEventArgs)

        If e.Item.ItemType = ListViewItemType.DataItem Then
            ' Display the e-mail address in italics.
            Dim EmailAddressLabel As Label = _
              CType(e.Item.FindControl("EmailAddressLabel"), Label)
            EmailAddressLabel.Font.Italic = True

            Dim rowView As System.Data.DataRowView
            rowView = CType(e.Item.DataItem, System.Data.DataRowView)
            Dim currentEmailAddress As String = rowView("EmailAddress").ToString()
            If currentEmailAddress = "orlando0@adventure-works.com" Then
                EmailAddressLabel.Font.Bold = True
            End If
        End If

    End Sub

</script>

<html >
<head id="Head1" runat="server">
    <title>ListView ItemDataBound Example</title>
</head>
<body style="font: 10pt Trebuchet MS">
    <form id="form1" runat="server">
    <h3>
        ListView ItemDataBound Example</h3>
    <asp:ListView ID="ContactsListView" DataSourceID="ContactsDataSource" ConvertEmptyStringToNull="true"
        OnItemDataBound="ContactsListView_ItemDataBound" runat="server">
        <layouttemplate>
          <table cellpadding="2" width="680px" border="0">
            <tr style="background-color: #ADD8E6" runat="server">
                <th runat="server">First Name</th>
                <th runat="server">Last Name</th>
                <th runat="server">E-mail Address</th>
            </tr>
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NumericPagerField ButtonCount="10" /> 
            </Fields>
          </asp:DataPager>
        </layouttemplate>
        <itemtemplate>
          <tr style="background-color: #CAEEFF" runat="server">
            <td>
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
            </td>
            <td>
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td>
              <asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </itemtemplate>
    </asp:ListView>
    <!-- This example uses Microsoft SQL Server and connects      -->
    <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
    <!-- expression to retrieve the connection string value       -->
    <!-- from the Web.config file.                                -->
    <asp:SqlDataSource ID="ContactsDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:AdventureWorksConnectionString %>"
        SelectCommand="SELECT FirstName, LastName, EmailAddress FROM SalesLT.Customer">
    </asp:SqlDataSource>
    </form>
</body>
</html>


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    protected void ContactsListView_ItemDataBound(object sender, ListViewItemEventArgs e)
    {
        Label EmailAddressLabel;
        if (e.Item.ItemType == ListViewItemType.DataItem)
        {
            // Display the e-mail address in italics.
            EmailAddressLabel = (Label)e.Item.FindControl("EmailAddressLabel");
            EmailAddressLabel.Font.Italic = true;

            System.Data.DataRowView rowView = e.Item.DataItem as System.Data.DataRowView;
            string currentEmailAddress = rowView["EmailAddress"].ToString();
            if (currentEmailAddress == "orlando0@adventure-works.com")
            {
                EmailAddressLabel.Font.Bold = true;
            }
        }
    }

</script>
<html >
<head id="Head1" runat="server">
    <title>ListView ItemDataBound Example</title>
</head>
<body style="font: 10pt Trebuchet MS">
    <form id="form1" runat="server">
    <h3>
        ListView ItemDataBound Example</h3>
    <asp:ListView ID="ContactsListView" DataSourceID="ContactsDataSource" ConvertEmptyStringToNull="true"
        OnItemDataBound="ContactsListView_ItemDataBound" runat="server">
        <LayoutTemplate>
            <table cellpadding="2" width="680px" border="0">
                <tr style="background-color: #ADD8E6" runat="server">
                    <th runat="server">
                        First Name
                    </th>
                    <th runat="server">
                        Last Name
                    </th>
                    <th runat="server">
                        E-mail Address
                    </th>
                </tr>
                <tr runat="server" id="itemPlaceholder" />
            </table>
            <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
                <Fields>
                    <asp:NumericPagerField ButtonCount="10" />
                </Fields>
            </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
            <tr style="background-color: #CAEEFF" runat="server">
                <td>
                    <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
                </td>
                <td>
                    <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
                </td>
                <td>
                    <asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
                </td>
            </tr>
        </ItemTemplate>
    </asp:ListView>
    <!-- This example uses Microsoft SQL Server and connects      -->
    <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
    <!-- expression to retrieve the connection string value       -->
    <!-- from the Web.config file.                                -->
    <asp:SqlDataSource ID="ContactsDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:AdventureWorksConnectionString %>"
        SelectCommand="SELECT FirstName, LastName, EmailAddress FROM SalesLT.Customer">
    </asp:SqlDataSource>
    </form>
</body>
</html>

Version Information

.NET Framework

Supported in: 4, 3.5

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role not supported), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Reference

System.Web.UI.WebControls Namespace

ListView

ItemCreated

ItemDataBound

Other Resources

ListView Web Server Control Overview

Consuming Events

Bibliothèque de classes .NET Framework

ListViewItemEventArgs, classe

Fournit des données pour les événements ItemCreated et ItemDataBound.

Hiérarchie d'héritage

System..::.Object
System..::.EventArgs
System.Web.UI.WebControls..::.ListViewItemEventArgs

Espace de noms : System.Web.UI.WebControls
Assembly : System.Web.Extensions (dans System.Web.Extensions.dll)

Syntaxe

Visual Basic

Public Class ListViewItemEventArgs _
    Inherits EventArgs

public class ListViewItemEventArgs : EventArgs

VisualC++

public ref class ListViewItemEventArgs : public EventArgs

type ListViewItemEventArgs =  
    class
        inherit EventArgs
    end

Le type ListViewItemEventArgs expose les membres suivants.

Constructeurs

	Nom	Description
	ListViewItemEventArgs	Initialise une nouvelle instance de la classe ListViewItemEventArgs.

Début

Propriétés

	Nom	Description
	Item	Obtient l'élément créé ou lié aux données.

Début

Méthodes

	Nom	Description
	Equals(Object)	Détermine si l'Object spécifié est égal à l'Object en cours. (Hérité de Object.)
	Finalize	Autorise un objet à tenter de libérer des ressources et d'exécuter d'autres opérations de netto***ge avant qu'il ne soit récupéré par l'opération garbage collection. (Hérité de Object.)
	GetHashCode	Sert de fonction de hachage pour un type particulier. (Hérité de Object.)
	GetType	Obtient le Type de l'instance actuelle. (Hérité de Object.)
	MemberwiseClone	Crée une copie superficielle de l'objet Object actif. (Hérité de Object.)
	ToString	Retourne une chaîne qui représente l'objet actuel. (Hérité de Object.)

Début

Notes

Avant que le contrôle ListView ne puisse être restitué, un objet ListViewItem doit être créé pour chaque élément du contrôle. L'événement ItemCreated est déclenché chaque fois qu'un élément est créé dans le contrôle ListView. Cela vous permet de fournir une méthode de gestion d'événements qui exécute une routine personnalisée chaque fois qu'un élément est créé, par exemple l'ajout d'un contenu personnalisé à un élément.

De même, avant que le contrôle ListView ne puisse être restitué, chaque élément du contrôle doit être lié à un enregistrement de la source de données. L'événement ItemDataBound est déclenché lorsqu'un élément (représenté par un objet ListViewItem) est lié aux données du contrôle ListView. Cela vous permet d'exécuter une routine personnalisée chaque fois qu'un élément est lié à des données, par exemple la modification des valeurs des données avant qu'elles ne soient affichées.

Un objet ListViewItemEventArgs est passé à la méthode de gestion d'événements, ce qui vous permet d'accéder aux propriétés de l'élément qui a déclenché l'événement. Pour déterminer quel type d'élément (élément de données, élément vide ou élément d'insertion) est créé, utilisez la propriété ItemType de l'objet ListViewItem.

Pour obtenir la liste des valeurs de propriétés initiales d'une instance de ListViewItemEventArgs, consultez le constructeur ListViewItemEventArgs.

Exemples

L'exemple suivant indique comment utiliser l'objet ListViewItemEventArgs pour accéder aux propriétés de l'élément lié aux données.

Visual Basic


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Protected Sub ContactsListView_ItemDataBound(ByVal sender As Object, _
                                                 ByVal e As ListViewItemEventArgs)

        If e.Item.ItemType = ListViewItemType.DataItem Then
            ' Display the e-mail address in italics.
            Dim EmailAddressLabel As Label = _
              CType(e.Item.FindControl("EmailAddressLabel"), Label)
            EmailAddressLabel.Font.Italic = True

            Dim rowView As System.Data.DataRowView
            rowView = CType(e.Item.DataItem, System.Data.DataRowView)
            Dim currentEmailAddress As String = rowView("EmailAddress").ToString()
            If currentEmailAddress = "orlando0@adventure-works.com" Then
                EmailAddressLabel.Font.Bold = True
            End If
        End If

    End Sub

</script>

<html >
<head id="Head1" runat="server">
    <title>ListView ItemDataBound Example</title>
</head>
<body style="font: 10pt Trebuchet MS">
    <form id="form1" runat="server">
    <h3>
        ListView ItemDataBound Example</h3>
    <asp:ListView ID="ContactsListView" DataSourceID="ContactsDataSource" ConvertEmptyStringToNull="true"
        OnItemDataBound="ContactsListView_ItemDataBound" runat="server">
        <layouttemplate>
          <table cellpadding="2" width="680px" border="0">
            <tr style="background-color: #ADD8E6" runat="server">
                <th runat="server">First Name</th>
                <th runat="server">Last Name</th>
                <th runat="server">E-mail Address</th>
            </tr>
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NumericPagerField ButtonCount="10" /> 
            </Fields>
          </asp:DataPager>
        </layouttemplate>
        <itemtemplate>
          <tr style="background-color: #CAEEFF" runat="server">
            <td>
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
            </td>
            <td>
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td>
              <asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </itemtemplate>
    </asp:ListView>
    <!-- This example uses Microsoft SQL Server and connects      -->
    <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
    <!-- expression to retrieve the connection string value       -->
    <!-- from the Web.config file.                                -->
    <asp:SqlDataSource ID="ContactsDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:AdventureWorksConnectionString %>"
        SelectCommand="SELECT FirstName, LastName, EmailAddress FROM SalesLT.Customer">
    </asp:SqlDataSource>
    </form>
</body>
</html>


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    protected void ContactsListView_ItemDataBound(object sender, ListViewItemEventArgs e)
    {
        Label EmailAddressLabel;
        if (e.Item.ItemType == ListViewItemType.DataItem)
        {
            // Display the e-mail address in italics.
            EmailAddressLabel = (Label)e.Item.FindControl("EmailAddressLabel");
            EmailAddressLabel.Font.Italic = true;

            System.Data.DataRowView rowView = e.Item.DataItem as System.Data.DataRowView;
            string currentEmailAddress = rowView["EmailAddress"].ToString();
            if (currentEmailAddress == "orlando0@adventure-works.com")
            {
                EmailAddressLabel.Font.Bold = true;
            }
        }
    }

</script>
<html >
<head id="Head1" runat="server">
    <title>ListView ItemDataBound Example</title>
</head>
<body style="font: 10pt Trebuchet MS">
    <form id="form1" runat="server">
    <h3>
        ListView ItemDataBound Example</h3>
    <asp:ListView ID="ContactsListView" DataSourceID="ContactsDataSource" ConvertEmptyStringToNull="true"
        OnItemDataBound="ContactsListView_ItemDataBound" runat="server">
        <LayoutTemplate>
            <table cellpadding="2" width="680px" border="0">
                <tr style="background-color: #ADD8E6" runat="server">
                    <th runat="server">
                        First Name
                    </th>
                    <th runat="server">
                        Last Name
                    </th>
                    <th runat="server">
                        E-mail Address
                    </th>
                </tr>
                <tr runat="server" id="itemPlaceholder" />
            </table>
            <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
                <Fields>
                    <asp:NumericPagerField ButtonCount="10" />
                </Fields>
            </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
            <tr style="background-color: #CAEEFF" runat="server">
                <td>
                    <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
                </td>
                <td>
                    <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
                </td>
                <td>
                    <asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
                </td>
            </tr>
        </ItemTemplate>
    </asp:ListView>
    <!-- This example uses Microsoft SQL Server and connects      -->
    <!-- to the AdventureWorks sample database. Use an ASP.NET    -->
    <!-- expression to retrieve the connection string value       -->
    <!-- from the Web.config file.                                -->
    <asp:SqlDataSource ID="ContactsDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:AdventureWorksConnectionString %>"
        SelectCommand="SELECT FirstName, LastName, EmailAddress FROM SalesLT.Customer">
    </asp:SqlDataSource>
    </form>
</body>
</html>

Informations de version

.NET Framework

Pris en charge dans : 4, 3.5

Plateformes

Windows 7, Windows Vista SP1 ou ultérieur, Windows XP SP3, Windows Server 2008 (installation minimale non prise en charge), Windows Server 2008 R2 (installation minimale prise en charge avec SP1 ou version ultérieure), Windows Server 2003 SP2

Le .NET Framework ne prend pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.

Sécurité des threads

Tous les membres static (Shared en Visual Basic) publics de ce type sont thread-safe. Il n'est pas garanti que les membres d'instance soient thread-safe.

Voir aussi

Référence

System.Web.UI.WebControls, espace de noms

ListView

ItemCreated

ItemDataBound

Autres ressources

Vue d'ensemble du contrôle serveur Web ListView

Consommation d'événements

Mots clés

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