DataGridItem.ItemIndex 属性

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

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获取来自 DataGridItem 控件的 Items 集合的 DataGrid 对象的索引。

public:
 virtual property int ItemIndex { int get(); };

public virtual int ItemIndex { get; }

member this.ItemIndex : int

Public Overridable ReadOnly Property ItemIndex As Integer

属性值

Int32

DataGridItem 控件的 Items 集合中的 DataGrid 的索引。

示例

下面的代码示例演示如何使用ItemIndex属性从Items控件集合DataGrid中显示对象的索引DataGridItem。

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。此代码示例必须复制到具有 .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“处理和引发事件”。

<%@ 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>

注解

ItemIndex使用属性从控件的集合DataGrid中确定对象的Items索引DataGridItem。

备注

此属性仅适用于控件中的数据 DataGrid 项。 ItemType对象的属性DataGridItem必须设置为ListItemType.Item、ListItemType.AlternatingItem或 ListItemType.SelectedItem``ListItemType.EditItem。

适用于

通过

DataGridItem.ItemIndex 属性

定义

属性值

示例

注解

适用于

另请参阅

其他资源