PagedControl.ItemWeight Propiedad

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.MobileControls
Ensamblado:
System.Web.Mobile.dll

Obtiene el peso aproximado de un único elemento en el control. Esta API está obsoleta. Para obtener información sobre cómo desarrollar aplicaciones móviles ASP.NET, consulte Mobile Apps & Sites with ASP.NET.

protected:
 virtual property int ItemWeight { int get(); };
protected virtual int ItemWeight { get; }
member this.ItemWeight : int
Protected Overridable ReadOnly Property ItemWeight As Integer

Valor de propiedad

Int32

Peso aproximado de un único elemento en el control.

Ejemplos

En el ejemplo de código siguiente se crea y se usa un control de lista personalizado. En el ejemplo se muestra cómo invalidar la ItemWeight propiedad de una List clase para especificar un nuevo peso de control.

<%@ Page Language="C#" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Security.Permissions" %>

<script runat="server">
    // A custom list control for illustration
    [AspNetHostingPermission(SecurityAction.Demand, 
        Level=AspNetHostingPermissionLevel.Minimal), 
    AspNetHostingPermission(SecurityAction.InheritanceDemand, 
        Level=AspNetHostingPermissionLevel.Minimal)]
    public class ListControl : List
    {
        public ListControl()
            : base()
        {}

        // Set a weight for the items
        protected override int ItemWeight
        {
            get { return 150; }
        }
    }

    ListControl List1;
    
    private void Page_Load(object sender, 
        System.EventArgs e)
    {
        // Instantiate the custom control
        List1 = new ListControl();
        List1.ItemCount = 20;
        List1.ID = "List1";
        List1.LoadItems += this.LoadNow;
        Form1.Controls.Add(List1);

        Form1.ControlToPaginate = List1;
    }

    // Called by the List whenever it needs new items
    private void LoadNow(object sender, 
        LoadItemsEventArgs e)
    {
        int j = e.ItemIndex;
        // You have to estimate the item size
        int estItemSize = 110;

        // Get the optimum page weight for the device
        int wt = 
            Form1.Adapter.Page.Adapter.OptimumPageWeight;
        // Get the number of items per page
        List1.ItemsPerPage = wt / estItemSize;
 
        // Build a section of the array
        ArrayList arr= new ArrayList();
        for (int i = 1; i <= e.ItemCount; i++)
        {
            int v = i + j;
            arr.Add((v.ToString() + " List Item"));
        }

        // Bind the array to the list
        List1.DataSource = arr;
        List1.DataBind();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
    <mobile:Form id="Form1" runat="server" 
        Paginate="true">
        <mobile:TextView ID="TextView1" 
            Runat="server" />
    </mobile:Form>
</body>
</html>

<%@ Page Language="VB" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Security.Permissions" %>

<script runat="server">
    ' A custom list control for illustration
    < _
    AspNetHostingPermission(SecurityAction.Demand, _
        Level:=AspNetHostingPermissionLevel.Minimal), _
    AspNetHostingPermission(SecurityAction.InheritanceDemand, _
        Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public Class ListControl
        Inherits List

        Public Sub New()
            MyBase.New()
        End Sub

        ' Set a weight for the items
        Protected Overrides ReadOnly _
            Property ItemWeight() As Integer
            Get
                Return 150
            End Get
        End Property
    End Class

    Dim WithEvents List1 As ListControl
    
    Private Sub Page_Load(ByVal sender As Object, _
        ByVal e As EventArgs)

        ' Instantiate the custom control
        List1 = New ListControl()
        List1.ItemCount = 20
        List1.ID = "List1"
        Form1.Controls.Add(List1)

        Form1.ControlToPaginate = List1
    End Sub

    ' Called by the List whenever it needs new items
    Private Sub LoadNow(ByVal sender As Object, _
        ByVal e As LoadItemsEventArgs) _
        Handles List1.LoadItems

        Dim j As Integer = e.ItemIndex
        
        ' You have to estimate the item size
        Dim estItemSize As Integer = 110

        ' Get the optimum page weight for the device
        Dim wt As Integer = _
            Form1.Adapter.Page.Adapter.OptimumPageWeight
        ' Get the number of items per page
        List1.ItemsPerPage = wt / estItemSize
 
        ' Build a section of the array
        Dim arr As New ArrayList()
        For i As Integer = 1 To e.ItemCount
            Dim v As Integer = i + j
            arr.Add((v.ToString() + " List Item"))
        Next

        ' Bind the array to the list
        List1.DataSource = arr
        List1.DataBind()
    End Sub
</script>

<html xmlns="http:'www.w3.org/1999/xhtml" >
<body>
    <mobile:Form id="Form1" runat="server" 
        Paginate="true">
        <mobile:TextView ID="TextView1" 
            Runat="server" />
    </mobile:Form>
</body>
</html>

Comentarios

Un valor de -1 indica que se debe usar el peso predeterminado del elemento. La clase heredada debe invalidar esta propiedad. Para obtener más información sobre cómo invalidar esta propiedad, vea Compatibilidad con paginación.

Se aplica a

Consulte también