GridView.TopPagerRow GridView.TopPagerRow GridView.TopPagerRow GridView.TopPagerRow Property

Definición

Obtiene un objeto GridViewRow que representa la fila de paginación superior de un control GridView.Gets a GridViewRow object that represents the top pager row in a GridView control.

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

Valor de propiedad

GridViewRow que representa la fila de paginación superior del control.A GridViewRow that represents the top pager row in the control.

Ejemplos

En el ejemplo siguiente se muestra cómo utilizar TopPagerRow la propiedad para tener acceso a la fila de paginación superior en un GridView control.The following example demonstrates how to use the TopPagerRow property to access the top pager row in a GridView control. La TopPagerRow propiedad se usa para recuperar un DropDownList control de la fila de paginación.The TopPagerRow property is used to retrieve a DropDownList control from the pager row.


<%@ 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 PageDropDownList_SelectedIndexChanged(Object sender, EventArgs e)
  {

    // Retrieve the pager row.
    GridViewRow pagerRow = CustomersGridView.TopPagerRow;
   
    // Retrieve the PageDropDownList DropDownList from the pager row.
    DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");

    // Set the PageIndex property to display that page selected by the user.
    CustomersGridView.PageIndex = pageList.SelectedIndex;

  }

  void CustomersGridView_DataBound(Object sender, EventArgs e)
  {
    
    // Retrieve the PagerRow.
    GridViewRow pagerRow = CustomersGridView.TopPagerRow;
    
    // Retrieve the DropDownList and Label controls from the row.
    DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
    Label pageLabel = (Label)pagerRow.Cells[0].FindControl("CurrentPageLabel");
        
    if(pageList != null)
    {
        
      // Create the values for the DropDownList control based on 
      // the  total number of pages required to display the data
      // source.
      for(int i=0; i<CustomersGridView.PageCount; i++)
      {
            
        // Create a ListItem object to represent a page.
        int pageNumber = i + 1;
        ListItem item = new ListItem(pageNumber.ToString());         
            
        // If the ListItem object matches the currently selected
        // page, flag the ListItem object as being selected. Because
        // the DropDownList control is recreated each time the pager
        // row gets created, this will persist the selected item in
        // the DropDownList control.   
        if(i==CustomersGridView.PageIndex)
        {
          item.Selected = true;
        }
            
        // Add the ListItem object to the Items collection of the 
        // DropDownList.
        pageList.Items.Add(item);
                
      }
        
    }
        
    if(pageLabel != null)
    {
        
      // Calculate the current page number.
      int currentPage = CustomersGridView.PageIndex + 1;     
        
      // Update the Label control with the current page information.
      pageLabel.Text = "Page " + currentPage.ToString() +
        " of " + CustomersGridView.PageCount.ToString();
        
    }    
    
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView TopPagerRow Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView TopPagerRow Example</h3>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource"   
        autogeneratecolumns="true"
        allowpaging="true"
        ondatabound="CustomersGridView_DataBound"  
        runat="server">
              
        <pagerstyle forecolor="Blue"
          backcolor="LightBlue"/>
          
        <pagersettings position="Top"/>
              
        <pagertemplate>
          
          <table width="100%">                    
            <tr>                        
              <td style="width:70%">
                          
                <asp:label id="MessageLabel"
                  forecolor="Blue"
                  text="Select a page:" 
                  runat="server"/>
                <asp:dropdownlist id="PageDropDownList"
                  autopostback="true"
                  onselectedindexchanged="PageDropDownList_SelectedIndexChanged" 
                  runat="server"/>
                      
              </td>   
                      
              <td style="width:70%" align="right">
                      
                <asp:label id="CurrentPageLabel"
                  forecolor="Blue"
                  runat="server"/>
                      
              </td>
                                            
            </tr>                    
          </table>
          
        </pagertemplate> 
          
      </asp:gridview>
            
      <!-- 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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </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 PageDropDownList_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    
    ' Retrieve the pager row.
    Dim pagerRow As GridViewRow = CustomersGridView.TopPagerRow
    
    ' Retrieve the PageDropDownList DropDownList from the bottom pager row.
    Dim pageList As DropDownList = CType(pagerRow.Cells(0).FindControl("PageDropDownList"), DropDownList)
        
    ' Set the PageIndex property to display that page selected by the user.
    CustomersGridView.PageIndex = pageList.SelectedIndex
    
  End Sub
    
  Sub CustomersGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
    
    ' Get the PagerRow.
    Dim pagerRow As GridViewRow = CustomersGridView.TopPagerRow
    
    ' Retrieve the DropDownList and Label controls from the row.
    Dim pageList As DropDownList = CType(pagerRow.Cells(0).FindControl("PageDropDownList"), DropDownList)
    Dim pageLabel As Label = CType(pagerRow.Cells(0).FindControl("CurrentPageLabel"), Label)
        
    If Not pageList Is Nothing Then
        
      ' Create the values for the DropDownList control based on 
      ' the  total number of pages required to display the data
      ' source.
      Dim i As Integer
            
      For i = 0 To CustomersGridView.PageCount - 1
            
        ' Create a ListItem object to represent a page.
        Dim pageNumber As Integer = i + 1
        Dim item As ListItem = New ListItem(pageNumber.ToString())
            
        ' If the ListItem object matches the currently selected
        ' page, flag the ListItem object as being selected. Because
        ' the DropDownList control is recreated each time the pager
        ' row gets created, this will persist the selected item in
        ' the DropDownList control.   
        If i = CustomersGridView.PageIndex Then
          
          item.Selected = True
                
        End If
            
        ' Add the ListItem object to the Items collection of the 
        ' DropDownList.
        pageList.Items.Add(item)
                
      Next i
        
    End If
        
    If Not pageLabel Is Nothing Then
        
      ' Calculate the current page number.
      Dim currentPage As Integer = CustomersGridView.PageIndex + 1
        
      ' Update the Label control with the current page information.
      pageLabel.Text = "Page " & currentPage.ToString() & _
          " of " & CustomersGridView.PageCount.ToString()
        
    End If
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView TopPagerRow Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView TopPagerRow Example</h3>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource"   
        autogeneratecolumns="true"
        allowpaging="true"
        ondatabound="CustomersGridView_DataBound"  
        runat="server">
              
        <pagerstyle forecolor="Blue"
          backcolor="LightBlue"/>
          
        <pagersettings position="Top"/>
              
        <pagertemplate>
          
          <table width="100%">                    
            <tr>                        
              <td style="width:70%">
                          
                <asp:label id="MessageLabel"
                  forecolor="Blue"
                  text="Select a page:" 
                  runat="server"/>
                <asp:dropdownlist id="PageDropDownList"
                  autopostback="true"
                  onselectedindexchanged="PageDropDownList_SelectedIndexChanged" 
                  runat="server"/>
                      
              </td>   
                      
              <td style="width:70%" align="right">
                      
                <asp:label id="CurrentPageLabel"
                  forecolor="Blue"
                  runat="server"/>
                      
              </td>
                                            
            </tr>                    
          </table>
          
        </pagertemplate> 
          
      </asp:gridview>
            
      <!-- 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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Comentarios

Cuando la paginación está habilitada ( AllowPaging estableciendo la truepropiedad en), se muestra automáticamente en el GridView control una fila adicional denominada fila de paginación.When paging is enabled (by setting the AllowPaging property to true), an additional row called the pager row is automatically displayed in the GridView control. La fila de buscapersonas contiene controles que permiten al usuario navegar a las otras páginas y se pueden mostrar en la parte superior, inferior o en la parte superior e inferior del control.The pager row contains controls that allow the user to navigate to the other pages and can be displayed at the top, the bottom, or both the top and bottom of the control. Utilice la TopPagerRow propiedad para tener acceso mediante programación GridViewRow al objeto que representa la fila de paginación superior GridView en un control.Use the TopPagerRow property to programmatically access the GridViewRow object that represents the top pager row in a GridView control.

Nota

La TopPagerRow propiedad solo está disponible después de GridView que el control cree la fila de paginación RowCreated superior en el evento.The TopPagerRow property is available only after the GridView control creates the top pager row in the RowCreated event.

Esta propiedad se utiliza normalmente cuando es necesario manipular mediante programación la fila de paginación superior, por ejemplo, al agregar contenido personalizado.This property is commonly used when you need to programmatically manipulate the top pager row, for example when adding custom content. Cualquier modificación de la TopPagerRow propiedad debe realizarse después de GridView que se haya representado el control; de lo GridView contrario, el control sobrescribirá los cambios.Any modification to the TopPagerRow property must be performed after the GridView control has been rendered; otherwise, the GridView control will overwrite any changes.

Se aplica a

Consulte también: