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ListControl.SelectedItem Propiedad

Definición

Obtiene el elemento seleccionado con el índice inferior en el control de lista.

public:
 virtual property System::Web::UI::WebControls::ListItem ^ SelectedItem { System::Web::UI::WebControls::ListItem ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.ListItem SelectedItem { get; }
[<System.ComponentModel.Browsable(false)>]
member this.SelectedItem : System.Web.UI.WebControls.ListItem
Public Overridable ReadOnly Property SelectedItem As ListItem

Valor de propiedad

Elemento seleccionado en el control de lista con el índice inferior. De manera predeterminada, es null.

Atributos

Ejemplos

En el ejemplo siguiente se muestra cómo usar SelectedItem para obtener las propiedades individuales del elemento seleccionado actualmente en RadioButtonList y para mostrar ese elemento y su valor.

<%@ 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("IntegerValue", typeof(Int32)));
       dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
       dt.Columns.Add(new DataColumn("DateTimeValue", typeof(DateTime)));
       dt.Columns.Add(new DataColumn("BoolValue", typeof(bool)));
       dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
 
       for (int i = 0; i < 9; i++) {
          dr = dt.NewRow();
 
          dr[0] = i;
          dr[1] = "Item " + i.ToString();
          dr[2] = DateTime.Now;
          dr[3] = (i % 2 != 0) ? true : false;
          dr[4] = 1.23 * (i+1);
 
          dt.Rows.Add(dr);
       }
 
       DataView dv = new DataView(dt);
       return dv;
    }
 
    void Page_Load(Object sender, EventArgs e) {
       if (!IsPostBack) {
          RadioButtonList1.DataSource = CreateDataSource();
          RadioButtonList1.DataTextField="StringValue";
          RadioButtonList1.DataValueField="CurrencyValue";
          RadioButtonList1.DataBind();
       }
    }
 
    void Index_Changed(Object sender, EventArgs e) {
 
       Label1.Text = "You selected " + RadioButtonList1.SelectedItem.Text +
                     " with a value of $" + RadioButtonList1.SelectedItem.Value +
                     ".";
 
    }
 
 </script>
 
 <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
 
    <form id="form1" runat="server">
 
       <asp:RadioButtonList id="RadioButtonList1" 
            OnSelectedIndexChanged="Index_Changed"
            AutoPostBack="true"
            runat="server"/>
 
       <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("IntegerValue", GetType(Int32)))
        dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
        dt.Columns.Add(New DataColumn("DateTimeValue", GetType(DateTime)))
        dt.Columns.Add(New DataColumn("BoolValue", GetType(Boolean)))
        dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
        
        Dim i As Integer
        For i = 0 To 8
            dr = dt.NewRow()
            
            dr(0) = i
            dr(1) = "Item " + i.ToString()
            dr(2) = DateTime.Now
            If (i Mod 2) <> 0 Then
                dr(3) = True
            Else
                dr(3) = False
            End If
            dr(4) = 1.23 *(i + 1)
            
            dt.Rows.Add(dr)
        Next i
        
        Dim dv As New DataView(dt)
        Return dv
    End Function

    Sub Page_Load(sender As Object, e As EventArgs)
        If Not IsPostBack Then
            RadioButtonList1.DataSource = CreateDataSource()
            RadioButtonList1.DataTextField = "StringValue"
            RadioButtonList1.DataValueField = "CurrencyValue"
            RadioButtonList1.DataBind()
        End If
    End Sub

    Sub Index_Changed(sender As Object, e As EventArgs)        
        Label1.Text = "You selected " & RadioButtonList1.SelectedItem.Text & _
            " with a value of : " & RadioButtonList1.SelectedItem.Value & "."
    End Sub
 
 </script>
 
 <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
 
    <form id="form1" runat="server">
 
       <asp:RadioButtonList id="RadioButtonList1" 
            OnSelectedIndexChanged="Index_Changed"
            AutoPostBack="true"
            runat="server"/>
 
       <br />
 
       <asp:Label id="Label1" runat="server"/>
 
    </form>
 
 </body>
 </html>

Comentarios

Si el control de lista solo permite una selección única, use esta propiedad para obtener las propiedades individuales del elemento seleccionado. Si el control de lista permite varias selecciones, use esta propiedad para obtener las propiedades del elemento indexado más bajo seleccionado en el control de lista.

Se aplica a

Consulte también