DetailsView.DataItemCount Propiedad
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Obtiene el número de elementos del origen de datos subyacente.
public:
property int DataItemCount { int get(); };[System.ComponentModel.Browsable(false)]
public int DataItemCount { get; }[<System.ComponentModel.Browsable(false)>]
member this.DataItemCount : intPublic ReadOnly Property DataItemCount As IntegerValor de propiedad
Número de elementos del origen de datos subyacente.
- Atributos
Ejemplos
En el ejemplo de código siguiente se muestra cómo usar la DataItemCount propiedad para determinar el número de elementos del origen de datos. Este valor se usa para mostrar el recuento de páginas en un Label control contenido en una fila de buscapersonas personalizada.
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void CustomerDetailView_DataBound(object sender, EventArgs e)
{
// Get the pager row.
DetailsViewRow pagerRow = CustomerDetailView.BottomPagerRow;
// Get the Label controls that display the current page information
// from the pager row.
Label pageNum = (Label)pagerRow.Cells[0].FindControl("PageNumberLabel");
Label totalNum = (Label)pagerRow.Cells[0].FindControl("TotalPagesLabel");
if ((pageNum != null) && (totalNum != null))
{
// Update the Label controls with the current page values.
int page = CustomerDetailView.DataItemIndex + 1;
int count = CustomerDetailView.DataItemCount;
pageNum.Text = page.ToString();
totalNum.Text = count.ToString();
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsView PagerTemplate Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>DetailsView PagerTemplate Example</h3>
<!-- Notice that the LinkButton controls in the pager -->
<!-- template have their CommandName properties set. -->
<!-- The DetailsView control automatically recognizes -->
<!-- certain command names and performs the appropriate -->
<!-- operation. In this example, the CommandName -->
<!-- properties are set "Page" and the CommandArgument -->
<!-- properties are set to "Next" and "Prev", which -->
<!-- causes the DetailsView control to navigate to the -->
<!-- next and previous record, respectively. -->
<asp:detailsview id="CustomerDetailView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
allowpaging="true"
runat="server" OnDataBound="CustomerDetailView_DataBound">
<headerstyle backcolor="Navy"
forecolor="White"/>
<pagerstyle VerticalAlign="Bottom" />
<pagertemplate>
<table width="100%">
<tr>
<td>
<asp:LinkButton id="PreviousButton"
text="<"
CommandName="Page"
CommandArgument="Prev"
runat="Server"/>
<asp:LinkButton id="NextButton"
text=">"
CommandName="Page"
CommandArgument="Next"
runat="Server"/>
</td>
<td align="right">
Page <asp:Label id="PageNumberLabel" runat="server" />
of <asp:Label id="TotalPagesLabel" runat="server" />
</td>
</tr>
</table>
</pagertemplate>
</asp:detailsview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the web.config file. -->
<asp:SqlDataSource ID="DetailsViewSource" runat="server"
ConnectionString=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
SelectCommand="Select [CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country] From
[Customers]">
</asp:SqlDataSource>
</form>
</body>
</html>
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub CustomerDetailView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
' Get the pager row.
Dim pagerRow As DetailsViewRow = CustomerDetailView.BottomPagerRow
' Get the Label controls that display the current page information
' from the pager row.
Dim pageNum As Label = CType(pagerRow.Cells(0).FindControl("PageNumberLabel"), Label)
Dim totalNum As Label = CType(pagerRow.Cells(0).FindControl("TotalPagesLabel"), Label)
If (pageNum IsNot Nothing) And (totalNum IsNot Nothing) Then
' Update the Label controls with the current page values.
Dim page As Integer = CustomerDetailView.DataItemIndex + 1
Dim count As Integer = CustomerDetailView.DataItemCount
pageNum.Text = page.ToString()
totalNum.Text = count.ToString()
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsView PagerTemplate Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>DetailsView PagerTemplate Example</h3>
<!-- Notice that the LinkButton controls in the pager -->
<!-- template have their CommandName properties set. -->
<!-- The DetailsView control automatically recognizes -->
<!-- certain command names and performs the appropriate -->
<!-- operation. In this example, the CommandName -->
<!-- properties are set "Page" and the CommandArgument -->
<!-- properties are set to "Next" and "Prev", which -->
<!-- causes the DetailsView control to navigate to the -->
<!-- next and previous record, respectively. -->
<asp:detailsview id="CustomerDetailView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
allowpaging="true"
runat="server" OnDataBound="CustomerDetailView_DataBound">
<headerstyle backcolor="Navy"
forecolor="White"/>
<pagerstyle VerticalAlign="Bottom" />
<pagertemplate>
<table width="100%">
<tr>
<td>
<asp:LinkButton id="PreviousButton"
text="<"
CommandName="Page"
CommandArgument="Prev"
runat="Server"/>
<asp:LinkButton id="NextButton"
text=">"
CommandName="Page"
CommandArgument="Next"
runat="Server"/>
</td>
<td align="right">
Page <asp:Label id="PageNumberLabel" runat="server" />
of <asp:Label id="TotalPagesLabel" runat="server" />
</td>
</tr>
</table>
</pagertemplate>
</asp:detailsview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the web.config file. -->
<asp:SqlDataSource ID="DetailsViewSource" runat="server"
ConnectionString=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
SelectCommand="Select [CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country] From
[Customers]">
</asp:SqlDataSource>
</form>
</body>
</html>
Comentarios
Cuando se habilita la característica de paginación (estableciendo la AllowPaging propiedad trueen ), use la DataItemCount propiedad para determinar el número total de registros en el origen de datos subyacente.
Nota
Dado que el DetailsView control solo muestra un registro cada vez, este valor también corresponde al número total de páginas necesarias para mostrar todos los registros del origen de datos.
Para determinar el índice del registro actual del origen de datos subyacente, use la DataItemIndex propiedad .