ListView.ItemDataBound Event
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Occurs when a data item is bound to data in a ListView control.
public:
event EventHandler<System::Web::UI::WebControls::ListViewItemEventArgs ^> ^ ItemDataBound;public event EventHandler<System.Web.UI.WebControls.ListViewItemEventArgs> ItemDataBound;member this.ItemDataBound : EventHandler<System.Web.UI.WebControls.ListViewItemEventArgs> Public Custom Event ItemDataBound As EventHandler(Of ListViewItemEventArgs) Event Type
Examples
The following example shows how to use the ItemDataBound event.
<%@ 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">
// <Snippet2>
protected void ContactsListView_ItemDataBound(object sender, ListViewItemEventArgs e)
{
Label EmailAddressLabel;
if (e.Item.ItemType == ListViewItemType.DataItem)
{
// Display the email 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;
}
}
}
// </Snippet2>
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<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">
Email 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="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
' <Snippet2>
Protected Sub ContactsListView_ItemDataBound(ByVal sender As Object, _
ByVal e As ListViewItemEventArgs)
If e.Item.ItemType = ListViewItemType.DataItem Then
' Display the email 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
' </Snippet2>
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<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">Email 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>
Remarks
Before the ListView control can be rendered, each item in the control must be bound to a record in the data source. The ItemDataBound event is raised when a data item is bound to data in the ListView control. (Data items are represented by ListViewDataItem objects.) This enables you to perform a custom routine whenever this event occurs, such as modifying the values of the data that is bound to the item.
A ListViewItemEventArgs object is passed to the event handler, which enables you to access the properties of the item that is being bound. To access a specific control in the item, use the FindControl method of the ListViewItem object that is contained in the Item property of the ListViewItemEventArgs object. You can determine which item type (data item, insert item, empty item) is being bound by using the ItemType property.
For more information about how to handle events, see Handling and Raising Events.
Applies to
See also
Met ons samenwerken op GitHub
De bron voor deze inhoud vindt u op GitHub, waar u ook problemen en pull-aanvragen kunt maken en controleren. Bekijk onze gids voor inzenders voor meer informatie.
