DetailsView.PageIndexChanging Evento

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.WebControls
Ensamblado:
System.Web.dll

Aparece cuando el valor de la propiedad PageIndex cambia antes de una operación de paginación.

public:
 event System::Web::UI::WebControls::DetailsViewPageEventHandler ^ PageIndexChanging;
public event System.Web.UI.WebControls.DetailsViewPageEventHandler PageIndexChanging;
member this.PageIndexChanging : System.Web.UI.WebControls.DetailsViewPageEventHandler 
Public Custom Event PageIndexChanging As DetailsViewPageEventHandler

Tipo de evento

DetailsViewPageEventHandler

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar el PageIndexChanging evento para cancelar una operación de paginación.


<%@ 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">


    void CustomerDetailView_ItemCommand(Object sender, 
      DetailsViewCommandEventArgs e)
    {
        // Clear the error message if the user cancels the edit 
        // operation.
        if (e.CommandName == "Cancel")
        {
            ErrorMessageLabel.Text = "";
        }
    }

    protected void CustomerDetailView_PageIndexChanging(
      object sender, DetailsViewPageEventArgs e)
    {
        // Cancel the paging operation if the user tries to 
        // navigate to another record while in edit mode.
        if (CustomerDetailView.CurrentMode == DetailsViewMode.Edit)
        {
            e.Cancel = true;
            // Display an error message.
            ErrorMessageLabel.Text = 
              "You cannot navigate to another record while in edit mode.";
        }

    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView CurrentMode Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView CurrentMode Example</h3>
        <asp:DetailsView ID="CustomerDetailView" 
          DataSourceID="DetailsViewSource" 
          AutoGenerateRows="true"
          AutoGenerateEditButton="true" 
          DataKeyNames="CustomerID" 
          GridLines="Both" 
          AllowPaging="true"
          OnItemCommand="CustomerDetailView_ItemCommand" 
          runat="server" 
          OnPageIndexChanging="CustomerDetailView_PageIndexChanging">
          
          <HeaderStyle BackColor="Navy" ForeColor="White" />
        </asp:DetailsView>
        
        <br />
        
        <asp:Label ID="ErrorMessageLabel" 
          ForeColor="Red" runat="server" />
        
        <!-- 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">


    Sub CustomerDetailView_ItemCommand(ByVal sender As Object, _
      ByVal e As DetailsViewCommandEventArgs)
        ' Clear the error message if the user cancels the edit 
        ' operation.
        If e.CommandName = "Cancel" Then
            ErrorMessageLabel.Text = ""
        End If
    End Sub

    Protected Sub CustomerDetailView_PageIndexChanging( _
    ByVal sender As Object, ByVal e As DetailsViewPageEventArgs)
        ' Cancel the paging operation if the user tries to navigate 
        ' to another record while in edit mode.
        If CustomerDetailView.CurrentMode = DetailsViewMode.Edit Then
            e.Cancel = True
            ' Display an error message.
            ErrorMessageLabel.Text = _
                "You cannot navigate to another record while in edit mode."
        End If
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView CurrentMode Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView CurrentMode Example</h3>
        <asp:DetailsView ID="CustomerDetailView" 
          DataSourceID="DetailsViewSource" 
          AutoGenerateRows="true"
          AutoGenerateEditButton="true" 
          DataKeyNames="CustomerID" 
          GridLines="Both" 
          AllowPaging="true"
          OnItemCommand="CustomerDetailView_ItemCommand" 
          runat="server" 
          OnPageIndexChanging="CustomerDetailView_PageIndexChanging">
          
          <HeaderStyle BackColor="Navy" ForeColor="White" />
        </asp:DetailsView>
        
        <br />
        
        <asp:Label ID="ErrorMessageLabel" 
          ForeColor="Red" runat="server" />
        
        <!-- 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

El DetailsView control genera el PageIndexChanging evento cuando se hace clic en un botón de buscapersonas (un botón con su CommandName propiedad establecida en "Page") dentro del control, pero antes de que el DetailsView control control controle la operación de paginación. Esto le permite proporcionar un controlador de eventos que realice una rutina personalizada, como cancelar la operación de paginación, siempre que se produzca este evento.

Nota

Este evento no se genera cuando se establece la PageIndex propiedad mediante programación.

Los botones de buscapersonas normalmente se encuentran en la fila del buscapersonas de un DetailsView control.

Se pasa un DetailsViewPageEventArgs objeto al controlador de eventos, que permite determinar el índice de la página seleccionada por el usuario e indicar que se debe cancelar la operación de paginación. Para determinar el índice de la página seleccionada por el usuario, use la NewPageIndex propiedad . Para cancelar la operación de paginación, establezca la Cancel propiedad del DetailsViewPageEventArgs objeto trueen .

Para obtener más información acerca de cómo controlar eventos, vea controlar y provocar eventos.

Se aplica a

Consulte también