DataListItem.ItemType Properti
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Mendapatkan jenis item yang diwakili oleh DataListItem objek dalam DataList kontrol.
public:
virtual property System::Web::UI::WebControls::ListItemType ItemType { System::Web::UI::WebControls::ListItemType get(); };
public virtual System.Web.UI.WebControls.ListItemType ItemType { get; }
member this.ItemType : System.Web.UI.WebControls.ListItemType
Public Overridable ReadOnly Property ItemType As ListItemType
Nilai Properti
Salah ListItemType satu nilai.
Contoh
Contoh berikut menunjukkan cara menggunakan ItemType properti untuk menentukan jenis item item yang diwakili oleh DataListItem objek . Urutan item yang dibuat dalam DataList kontrol ditampilkan bersama dengan jenis item.
Catatan
Sampel kode berikut menggunakan model kode file tunggal dan mungkin tidak berfungsi dengan benar jika disalin langsung ke file code-behind. Sampel kode ini harus disalin ke dalam file teks kosong yang memiliki ekstensi .aspx. Untuk informasi selengkapnya tentang model kode Formulir Web, lihat Model Kode Halaman Formulir Web ASP.NET.
<%@ 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 DataList 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 < 9; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Description for 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)
{
ItemsList.DataSource = CreateDataSource();
ItemsList.DataBind();
}
}
void Item_Created(Object sender, DataListItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
// Retrieve the Label control in the current DataListItem.
Label PriceLabel = (Label)e.Item.FindControl("PriceLabel");
// Retrieve the text of the CurrencyColumn from the DataListItem
// and convert the value to a Double.
Double Price = Convert.ToDouble(
((DataRowView)e.Item.DataItem).Row.ItemArray[2].ToString());
// Format the value as currency and redisplay it in the DataList.
PriceLabel.Text = Price.ToString("c");
}
}
</script>
<head runat="server">
<title>DataList ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataList ItemCreated Example</h3>
<asp:DataList id="ItemsList"
BorderColor="black"
CellPadding="5"
CellSpacing="5"
RepeatDirection="Vertical"
RepeatLayout="Table"
RepeatColumns="3"
OnItemCreated="Item_Created"
runat="server">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<AlternatingItemStyle BackColor="Gainsboro">
</AlternatingItemStyle>
<HeaderTemplate>
List of items
</HeaderTemplate>
<ItemTemplate>
Description: <br />
<%# DataBinder.Eval(Container.DataItem, "StringValue") %>
<br />
Price:
<asp:Label id="PriceLabel"
runat="server"/>
</ItemTemplate>
</asp:DataList>
</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 DataList 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 8
dr = dt.NewRow()
dr(0) = i
dr(1) = "Description for 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
ItemsList.DataSource = CreateDataSource()
ItemsList.DataBind()
End If
End Sub
Sub Item_Created(sender As Object, e As DataListItemEventArgs)
If e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem Then
' Retrieve the Label control in the current DataListItem.
Dim PriceLabel As Label = _
CType(e.Item.FindControl("PriceLabel"), Label)
' Retrieve the text of the CurrencyColumn from the DataListItem
' and convert the value to a Double.
Dim Price As Double = Convert.ToDouble( _
(CType(e.Item.DataItem, DataRowView)).Row.ItemArray(2).ToString())
' Format the value as currency and redisplay it in the DataList.
PriceLabel.Text = Price.ToString("c")
End If
End Sub
</script>
<head runat="server">
<title>DataList ItemCreated Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataList ItemCreated Example</h3>
<asp:DataList id="ItemsList"
BorderColor="black"
CellPadding="5"
CellSpacing="5"
RepeatDirection="Vertical"
RepeatLayout="Table"
RepeatColumns="3"
OnItemCreated="Item_Created"
runat="server">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<AlternatingItemStyle BackColor="Gainsboro">
</AlternatingItemStyle>
<HeaderTemplate>
List of items
</HeaderTemplate>
<ItemTemplate>
Description: <br />
<%# DataBinder.Eval(Container.DataItem, "StringValue") %>
<br />
Price:
<asp:Label id="PriceLabel"
runat="server"/>
</ItemTemplate>
</asp:DataList>
</form>
</body>
</html>
Keterangan
ItemType Gunakan properti untuk menentukan jenis item yang diwakili oleh DataListItem objek . Tabel berikut ini mencantumkan berbagai jenis item.
Jenis Item | Deskripsi |
---|---|
Header |
Bagian judul DataList kontrol. |
Footer |
Bagian footer DataList kontrol. |
Item |
Item dalam DataList kontrol. |
AlternatingItem |
Item alternatif dalam DataList kontrol. |
SelectedItem |
Item terpilih dalam DataList kontrol. |
EditItem |
Item yang dipilih untuk diedit di DataList kontrol. |
Separator |
Pemisah di antara item DataList kontrol. |
Pager |
Bagian pilihan halaman kontrol DataList . |