DataGrid.OnItemCreated(DataGridItemEventArgs) Methode
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee wordt de ItemCreated gebeurtenis gegenereerd. Hiermee kunt u een aangepaste handler voor de gebeurtenis opgeven.
protected:
virtual void OnItemCreated(System::Web::UI::WebControls::DataGridItemEventArgs ^ e);protected virtual void OnItemCreated(System.Web.UI.WebControls.DataGridItemEventArgs e);abstract member OnItemCreated : System.Web.UI.WebControls.DataGridItemEventArgs -> unit
override this.OnItemCreated : System.Web.UI.WebControls.DataGridItemEventArgs -> unitProtected Overridable Sub OnItemCreated (e As DataGridItemEventArgs)Parameters
Een DataGridItemEventArgs met gebeurtenisgegevens.
Voorbeelden
In het volgende codevoorbeeld ziet u hoe u een handler voor de ItemCreated gebeurtenis opgeeft en codeeert om de volgorde weer te geven waarin items in het DataGrid besturingselement worden gemaakt.
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="C#" runat="server">
DataTable Cart;
DataView CartView;
ICollection CreateDataSource()
{
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
for (int i = 0; i < 10; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = 1.23 * (i+1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
if (!IsPostBack)
{
// Need to load this data only once.
ItemsGrid.DataSource = CreateDataSource();
ItemsGrid.DataBind();
}
}
void Item_Created(Object sender, DataGridItemEventArgs e)
{
Label1.Text = Label1.Text + " " + e.Item.ItemIndex;
}
</script>
<head runat="server">
<title>DataGrid ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid ItemCreated Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true"
OnItemCreated="Item_Created"
AutoGenerateColumns="true">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
<br />
<asp:Label id="Label1"
Text="Order of items created: "
runat="server"/>
<br />
<asp:Label id="Label2"
Text="Note: The -1's refer to the header and footer."
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="VB" runat="server">
Dim Cart As DataTable
Dim CartView As DataView
Function CreateDataSource() As ICollection
Dim dt As New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
Dim i As Integer
For i = 0 To 9
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " & i.ToString()
dr(2) = 1.23 *(i + 1)
dt.Rows.Add(dr)
Next i
Dim dv As New DataView(dt)
Return dv
End Function 'CreateDataSource
Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack Then
' Need to load this data only once.
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub 'Page_Load
Sub Item_Created(sender As Object, e As DataGridItemEventArgs)
Label1.Text = Label1.Text & " " & e.Item.ItemIndex
End Sub 'Item_Created
</script>
<head runat="server">
<title>DataGrid ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid ItemCreated Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true"
OnItemCreated="Item_Created"
AutoGenerateColumns="true">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
<br />
<asp:Label id="Label1"
Text="Order of items created: "
runat="server"/>
<br />
<asp:Label id="Label2"
Text="Note: The -1's refer to the header and footer."
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
ICollection CreateDataSource()
{
// Create sample data for the DataGrid control.
DataTable dt = new DataTable();
DataRow dr;
// Define the columns of the table.
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));
// Populate the table with sample values.
for (int i=0; i<=10; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = 1.23 * (i + 1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
// Load sample data only once, when the page is first loaded.
if (!IsPostBack)
{
ItemsGrid.DataSource = CreateDataSource();
ItemsGrid.DataBind();
}
}
void Item_Created(Object sender, DataGridItemEventArgs e)
{
// Customize the footer section with an image.
if(e.Item.ItemType == ListItemType.Footer)
{
// Create an Image control.
System.Web.UI.WebControls.Image NewImageControl = new System.Web.UI.WebControls.Image();
// Set the properties of the Image control.
NewImageControl.ImageUrl = "Image1.jpg";
NewImageControl.AlternateText = "Image 1";
// Add the Image control to the Controls collection of the
// cell representing the third column in the DataGrid.
e.Item.Cells[2].Controls.Add(NewImageControl);
}
}
</script>
<head runat="server">
<title>DataGrid ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid ItemCreated Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true"
OnItemCreated="Item_Created">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
Function CreateDataSource() As ICollection
' Create sample data for the DataGrid control.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
' Define the columns of the table.
dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
' Populate the table with sample values.
Dim i As Integer
For i=0 To 10
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " & i.ToString()
dr(2) = 1.23 * (i + 1)
dt.Rows.Add(dr)
Next i
Dim dv As DataView = New DataView(dt)
return dv
End Function
Sub Page_Load(sender As Object, e As EventArgs)
' Load sample data only once, when the page is first loaded.
If Not IsPostBack Then
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub
Sub Item_Created(sender As Object, e As DataGridItemEventArgs)
' Customize the footer section with an image.
If e.Item.ItemType = ListItemType.Footer Then
' Create an Image control.
Dim NewImageControl As System.Web.UI.WebControls.Image = New System.Web.UI.WebControls.Image()
' Set the properties of the Image control.
NewImageControl.ImageUrl = "Image1.jpg"
NewImageControl.AlternateText = "Image 1"
' Add the Image control to the Controls collection of the
' cell representing the third column in the DataGrid.
e.Item.Cells(2).Controls.Add(NewImageControl)
End If
End Sub
</script>
<head runat="server">
<title>DataGrid ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid ItemCreated Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true"
OnItemCreated="Item_Created">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
ICollection CreateDataSource()
{
// Create sample data for the DataGrid control.
DataTable dt = new DataTable();
DataRow dr;
// Define the columns of the table.
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));
// Populate the table with sample values.
for (int i=0; i<=10; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = 1.23 * (i + 1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
// Manually register the event-handling method for the ItemCreated
// event of the DataGrid control.
ItemsGrid.ItemCreated +=
new DataGridItemEventHandler(this.Item_Created);
// Load sample data only once, when the page is first loaded.
if (!IsPostBack)
{
ItemsGrid.DataSource = CreateDataSource();
ItemsGrid.DataBind();
}
}
void Item_Created(Object sender, DataGridItemEventArgs e)
{
// Customize the footer section with an image.
if(e.Item.ItemType == ListItemType.Footer)
{
// Create an Image control.
System.Web.UI.WebControls.Image NewImageControl = new System.Web.UI.WebControls.Image();
// Set the properties of the Image control.
NewImageControl.ImageUrl = "Image1.jpg";
NewImageControl.AlternateText = "Image 1";
// Add the Image control to the Controls collection of the
// cell representing the third column in the DataGrid.
e.Item.Cells[2].Controls.Add(NewImageControl);
}
}
</script>
<head runat="server">
<title>DataGrid ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid ItemCreated Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script runat="server">
Function CreateDataSource() As ICollection
' Create sample data for the DataGrid control.
Dim dt As DataTable = New DataTable()
Dim dr As DataRow
' Define the columns of the table.
dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
' Populate the table with sample values.
Dim i As Integer
For i=0 To 10
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " & i.ToString()
dr(2) = 1.23 * (i + 1)
dt.Rows.Add(dr)
Next i
Dim dv As DataView = New DataView(dt)
return dv
End Function
Sub Page_Load(sender As Object, e As EventArgs)
' Manually register the event-handling method for the ItemCreated
' event of the DataGrid control.
AddHandler ItemsGrid.ItemCreated, AddressOf Item_Created
' Load sample data only once, when the page is first loaded.
If Not IsPostBack Then
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub
Sub Item_Created(sender As Object, e As DataGridItemEventArgs)
' Customize the footer section with an image.
If e.Item.ItemType = ListItemType.Footer Then
' Create an Image control.
Dim NewImageControl As System.Web.UI.WebControls.Image = New System.Web.UI.WebControls.Image()
' Set the properties of the Image control.
NewImageControl.ImageUrl = "Image1.jpg"
NewImageControl.AlternateText = "Image 1"
' Add the Image control to the Controls collection of the
' cell representing the third column in the DataGrid.
e.Item.Cells(2).Controls.Add(NewImageControl)
End If
End Sub
</script>
<head runat="server">
<title>DataGrid ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid ItemCreated Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
</form>
</body>
</html>
Opmerkingen
Gebruik de OnItemCreated methode om een aangepaste handler voor de ItemCreated gebeurtenis op te geven.
De ItemCreated gebeurtenis wordt gegenereerd wanneer een item in het DataGrid besturingselement wordt gemaakt, zowel tijdens retouren als op het moment dat de gegevens aan het besturingselement zijn gebonden.
De ItemCreated gebeurtenis wordt vaak gebruikt om de inhoud en het uiterlijk van een rij in het DataGrid besturingselement te bepalen.
Als u een gebeurtenis aanroept, wordt de gebeurtenis-handler via een gemachtigde aangeroepen. Zie Afhandeling en het genereren van gebeurtenissen voor meer informatie.
Notities voor overnemers
Wanneer u OnItemCreated(DataGridItemEventArgs) overschrijft in een afgeleide klasse, moet u de methode van OnItemCreated(DataGridItemEventArgs) de basisklasse aanroepen.
Zie Gebeurtenissen verwerken en genereren voor meer informatie over het afhandelen van gebeurtenissen.