DataListItem.DataItem 属性
定义
重要
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获取或设置与 DataListItem 控件中 DataList 对象关联的数据项。
public:
virtual property System::Object ^ DataItem { System::Object ^ get(); void set(System::Object ^ value); };public virtual object DataItem { get; set; }member this.DataItem : obj with get, setPublic Overridable Property DataItem As Object属性值
一个 Object，它表示 DataList 控件中的一个数据项。
示例
以下示例演示如何使用 DataItem 属性显示控件中的数据 DataList 项的内容。
备注
下面的代码示例使用单文件代码模型，如果直接复制到代码隐藏文件中，可能无法正常工作。 必须将此代码示例复制到具有 .aspx 扩展名的空文本文件中。 有关Web Forms代码模型的详细信息，请参阅 ASP.NET Web Forms页代码模型。
<%@ 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>
注解
使用该 DataItem 属性可以指定或确定与 DataListItem 控件中的 DataList 对象关联的数据项的属性。
备注
此属性仅适用于控件中的数据 DataList 项。 对象的 ItemType 属性 DataListItem 必须设置为枚举值之一 ListItemType 。