DataList.Items 属性
定义
获取表示控件内单独项的 DataListItem 对象的集合。Gets a collection of DataListItem objects representing the individual items within the control.
public:
virtual property System::Web::UI::WebControls::DataListItemCollection ^ Items { System::Web::UI::WebControls::DataListItemCollection ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataListItemCollection Items { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Items : System.Web.UI.WebControls.DataListItemCollection
Public Overridable ReadOnly Property Items As DataListItemCollection
属性值
一个 DataListItemCollection,它包含表示 DataListItem 控件内单独项的 DataList 对象的集合。A DataListItemCollection that contains a collection of DataListItem objects representing the individual items within the DataList control.
- 属性
示例
下面的代码示例演示如何使用 Items 集合来显示控件中的项 DataList 。The following code example demonstrates how to use the Items collection to display the items in the DataList control.
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,则可能无法正常工作。The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. 必须将此代码示例复制到扩展名为 .aspx 的空文本文件中。This code sample must be copied into an empty text file that has an .aspx extension. 有关 Web 窗体代码模型的详细信息,请参阅 ASP.NET Web 窗体页代码模型。For more information on the Web Forms code model, see ASP.NET Web Forms Page Code Model.
<%@ 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">
ICollection CreateDataSource()
{
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
for (int i = 0; i < 10; i++)
{
dr = dt.NewRow();
dr[0] = "Item " + i.ToString();
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
if (!IsPostBack)
{
DataList1.DataSource = CreateDataSource();
DataList1.DataBind();
}
}
void Button_Click(Object sender, EventArgs e)
{
if (DataList1.Items.Count > 0)
{
Label1.Text = "The Items collection contains: <br />";
foreach(DataListItem item in DataList1.Items)
{
Label1.Text += ((DataBoundLiteralControl)item.Controls[0]).Text +
"<br />";
}
}
}
</script>
<head runat="server">
<title>DataList Items Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataList Items Example</h3>
<asp:DataList id="DataList1" runat="server"
BorderColor="black"
CellPadding="3"
Font-Names="Verdana"
Font-Size="8pt">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<AlternatingItemStyle BackColor="Gainsboro">
</AlternatingItemStyle>
<HeaderTemplate>
Items
</HeaderTemplate>
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem, "StringValue") %>
</ItemTemplate>
</asp:DataList>
<br /><br />
<asp:Button id="Button1"
Text="Display Contents of Items Collection"
OnClick="Button_Click"
runat="server"/>
<br /><br />
<asp:Label id="Label1"
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">
Function CreateDataSource() As ICollection
Dim dt As New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
Dim i As Integer
For i = 0 To 9
dr = dt.NewRow()
dr(0) = "Item " & i.ToString()
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
DataList1.DataSource = CreateDataSource()
DataList1.DataBind()
End If
End Sub 'Page_Load
Sub Button_Click(sender As Object, e As EventArgs)
If DataList1.Items.Count > 0 Then
Label1.Text = "The Items collection contains: <br />"
Dim item As DataListItem
For Each item In DataList1.Items
Label1.Text += CType(item.Controls(0), DataBoundLiteralControl).Text & "<br />"
Next item
End If
End Sub 'Button_Click
</script>
<head runat="server">
<title>DataList Items Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataList Items Example</h3>
<asp:DataList id="DataList1" runat="server"
BorderColor="black"
CellPadding="3"
Font-Names="Verdana"
Font-Size="8pt">
<HeaderStyle BackColor="#aaaadd">
</HeaderStyle>
<AlternatingItemStyle BackColor="Gainsboro">
</AlternatingItemStyle>
<HeaderTemplate>
Items
</HeaderTemplate>
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem, "StringValue") %>
</ItemTemplate>
</asp:DataList>
<br /><br />
<asp:Button id="Button1"
Text="Display Contents of Items Collection"
OnClick="Button_Click"
runat="server"/>
<br /><br />
<asp:Label id="Label1"
runat="server"/>
</form>
</body>
</html>
注解
使用 Items 集合以编程方式控制控件中的项 DataList 。Use the Items collection to programmatically control the items in the DataList control. Items集合不提供任何方法来向集合添加项或从中移除项。The Items collection does not provide any methods to add or remove items to the collection. 但是,您可以通过为事件提供处理程序来控制项的内容 ItemCreated 。However, you can control the contents of an item by providing a handler for the ItemCreated event.
备注
集合中只包含绑定到数据源的项 Items 。Only items bound to the data source are contained in the Items collection. 标头、脚注和分隔符不包含在集合中。The header, footer, and separator are not included in the collection.