DataList.SelectedItem Properti

Referensi

Definisi

Ruang nama:: System.Web.UI.WebControls

Rakitan:: System.Web.dll

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 item terpilih dalam DataList kontrol.

public:
 virtual property System::Web::UI::WebControls::DataListItem ^ SelectedItem { System::Web::UI::WebControls::DataListItem ^ get(); };

[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataListItem SelectedItem { get; }

[<System.ComponentModel.Browsable(false)>]
member this.SelectedItem : System.Web.UI.WebControls.DataListItem

Public Overridable ReadOnly Property SelectedItem As DataListItem

Nilai Properti

DataListItem

DataListItem yang mewakili item yang dipilih dalam DataList kontrol.

Atribut: BrowsableAttribute

Contoh

Contoh kode berikut menunjukkan cara menggunakan SelectedItem properti untuk menampilkan konten item yang dipilih dalam DataList kontrol.

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 ASP.NET Model Kode Halaman Formulir Web.

<%@ 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" >
<head>
    <title>DataList SelectedItem Example</title>
<script language="C#" runat="server">

      public DataTable Cart;
      public DataView CartView;

      void Page_Load(Object sender, EventArgs e) 
      {
         if (Session["DL3_ShoppingCart"] == null) 
         {
            Cart = new DataTable();
            Cart.Columns.Add(new DataColumn("Qty", typeof(string)));
            Cart.Columns.Add(new DataColumn("Item", typeof(string)));
            Cart.Columns.Add(new DataColumn("Price", typeof(string)));
            Session["DL3_ShoppingCart"] = Cart;

            // First Load - Create some data.
            for (int i=1; i<=9; i++) 
            {
               DataRow dr = Cart.NewRow();
               dr[0] = ((i%2)+1).ToString();
               dr[1] = "Item " + i.ToString();
               dr[2] = (1.23 * (i+1)).ToString();
               Cart.Rows.Add(dr);
            }
         }
         else
            Cart = (DataTable)Session["DL3_ShoppingCart"];

         CartView = new DataView(Cart);
         CartView.Sort = "Item";
         if (!IsPostBack)
            BindList();
      }

      void BindList() 
      {
         DataList1.DataSource= CartView;
         DataList1.DataBind();
      }

      void DataList_ItemCommand(Object sender, DataListCommandEventArgs e) 
      {
         DataList1.SelectedIndex = e.Item.ItemIndex;
         BindList();
         Label4.Text = "You selected: "  + 
                       ((Label)DataList1.SelectedItem.FindControl("Label1")).Text;
      }

      void Button_Click(Object sender, EventArgs e)
      { 
         if (DataList1.SelectedItem != null)
         {
            DataList1.SelectedItem.ForeColor = System.Drawing.Color.Red;
         }
      }

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>DataList SelectedItem Example</h3>
      <p></p>
       
      <asp:DataList id="DataList1" runat="server"
           GridLines="Both"
           CellPadding="3"
           CellSpacing="0"           
           OnItemCommand="DataList_ItemCommand">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <SelectedItemStyle BackColor="lightgreen">
         </SelectedItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
         
         <ItemTemplate>

            <asp:LinkButton id="button1" 
                 Text="Select" 
                 CommandName="select"
                 runat="server"/>
            <%# ((DataRowView)Container.DataItem)["Item"]  %>

         </ItemTemplate>
              
         <SelectedItemTemplate>

            Item:
            <asp:Label id="Label1" 
                 Text='<%# ((DataRowView)Container.DataItem)["Item"] %>' 
                 runat="server"/>

            <br />

            Quantity:
            <asp:Label id="Label2" 
                 Text='<%# ((DataRowView)Container.DataItem)["Qty"] %>' 
                 runat="server"/>

            <br />

            Price:
            <asp:Label id="Label3" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Price") %>' 
                 runat="server"/>

         </SelectedItemTemplate>

      </asp:DataList>

      <br /><br />

      <asp:Label id="Label4"
           runat="server"/>

      <br /><br />

      <asp:Button id="Button2"
           Text="Change Text to Red" 
           OnClick="Button_Click"
           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" >
<head>
    <title>DataList SelectedItem Example</title>
<script language="VB" runat="server">
 
    Dim Cart As DataTable
    Dim CartView As DataView

    Sub Page_Load(sender As Object, e As EventArgs)
        If Session("DL3_ShoppingCart") Is Nothing Then
            Cart = New DataTable()
            Cart.Columns.Add(New DataColumn("Qty", GetType(String)))
            Cart.Columns.Add(New DataColumn("Item", GetType(String)))
            Cart.Columns.Add(New DataColumn("Price", GetType(String)))
            Session("DL3_ShoppingCart") = Cart
            
            ' First Load - Create some data.
            Dim i As Integer
            For i = 1 To 9
                Dim dr As DataRow = Cart.NewRow()
                dr(0) =(i Mod 2 + 1).ToString()
                dr(1) = "Item " & i.ToString()
                dr(2) =(1.23 *(i + 1)).ToString()
                Cart.Rows.Add(dr)
            Next i
        Else
            Cart = CType(Session("DL3_ShoppingCart"), DataTable)
        End If 
        CartView = New DataView(Cart)
        CartView.Sort = "Item"
        If Not IsPostBack Then
            BindList()
        End If
    End Sub 'Page_Load
     
    Sub BindList()
        DataList1.DataSource = CartView
        DataList1.DataBind()
    End Sub 'BindList

    Sub DataList_ItemCommand(sender As Object, e As DataListCommandEventArgs)
        DataList1.SelectedIndex = e.Item.ItemIndex
        BindList()
        Label4.Text = "You selected: " & CType(DataList1.SelectedItem.FindControl("Label1"), Label).Text
    End Sub 'DataList_ItemCommand

    Sub Button_Click(sender As Object, e As EventArgs)
        If Not (DataList1.SelectedItem Is Nothing) Then
            DataList1.SelectedItem.ForeColor = System.Drawing.Color.Red
        End If
    End Sub 'Button_Click

</script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>DataList SelectedItem Example</h3>
      <p></p>
       
      <asp:DataList id="DataList1" runat="server"
           GridLines="Both"
           CellPadding="3"
           CellSpacing="0"           
           OnItemCommand="DataList_ItemCommand">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <SelectedItemStyle BackColor="lightgreen">
         </SelectedItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
         
         <ItemTemplate>

            <asp:LinkButton id="button1" 
                 Text="Select" 
                 CommandName="select"
                 runat="server"/>
            <%# (CType(Container.DataItem, DataRowView))("Item")%>

         </ItemTemplate>
              
         <SelectedItemTemplate>

            Item:
            <asp:Label id="Label1" 
                 Text='<%# (CType(Container.DataItem, DataRowView))("Item")%>' 
                 runat="server"/>

            <br />

            Quantity:
            <asp:Label id="Label2" 
                 Text='<%# (CType(Container.DataItem, DataRowView))("Qty")%>' 
                 runat="server"/>

            <br />

            Price:
            <asp:Label id="Label3" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Price")%>' 
                 runat="server"/>

         </SelectedItemTemplate>

      </asp:DataList>

      <br /><br />

      <asp:Label id="Label4"
           runat="server"/>

      <br /><br />

      <asp:Button id="Button2"
           Text="Change Text to Red" 
           OnClick="Button_Click"
           runat="server"/>

   </form>

</body>
</html>

Keterangan

SelectedItem Gunakan properti untuk mendapatkan DataListItem objek yang mewakili item yang dipilih dalam DataList kontrol. Objek ini kemudian dapat digunakan untuk mengakses properti item terpilih.

Berlaku untuk

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