DataGridItem.ItemIndex 屬性
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
從 DataGridItem 控制項的 Items 集合中,取得 DataGrid 物件的索引。
public:
virtual property int ItemIndex { int get(); };
public virtual int ItemIndex { get; }
member this.ItemIndex : int
Public Overridable ReadOnly Property ItemIndex As Integer
屬性值
DataGridItem 控制項之 Items 集合中 DataGrid 的索引。
範例
下列程式碼範例示範如何使用 ItemIndex 屬性,從 Items 控制項的集合 DataGrid 顯示 物件的索引 DataGridItem 。
注意
下列程式碼範例會使用單一檔案程式碼模型,如果直接複製到程式碼後置檔案,可能無法正常運作。 此程式碼範例必須複製到副檔名為 .aspx 的空白文字檔。 如需Web Form程式碼模型的詳細資訊,請參閱處理和引發事件。
<%@ 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 Button_Click(Object sender, EventArgs e)
{
Label1.Text = "The DataSetIndex of each item in the DataGrid are: <br />";
foreach (DataGridItem item in ItemsGrid.Items)
{
Label1.Text += "<br />" + item.ItemIndex.ToString() +
" - " + item.Cells[1].Text;
}
}
</script>
<head runat="server">
<title>DataGridItem ItemIndex Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGridItem ItemIndex Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true"
AutoGenerateColumns="true">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
<br />
<asp:Button id="Button1"
Text="Display ItemIndex of Items in DataGrid"
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">
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 Button_Click(sender As Object, e As EventArgs)
Label1.Text = "The DataSetIndex of each item in the DataGrid are: <br />"
Dim item As DataGridItem
For Each item In ItemsGrid.Items
Label1.Text &= "<br />" & item.ItemIndex.ToString() & " - " & item.Cells(1).Text
Next item
End Sub 'Button_Click
</script>
<head runat="server">
<title>DataGridItem ItemIndex Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGridItem ItemIndex Example</h3>
<asp:DataGrid id="ItemsGrid" runat="server"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
ShowFooter="true"
AutoGenerateColumns="true">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<FooterStyle BackColor="#00aaaa">
</FooterStyle>
</asp:DataGrid>
<br />
<asp:Button id="Button1"
Text="Display ItemIndex of Items in DataGrid"
OnClick="Button_Click"
runat="server"/>
<br /><br />
<asp:Label id="Label1"
runat="server"/>
</form>
</body>
</html>
備註
ItemIndex使用 屬性,從 Items 控制項的 DataGrid 集合中判斷 物件的索引 DataGridItem 。
注意
此屬性僅適用于 控制項中的資料 DataGrid 項。 物件的 ItemType 屬性 DataGridItem 必須設定為 ListItemType.Item
、 ListItemType.AlternatingItem
、 ListItemType.SelectedItem
或 ListItemType.EditItem
。