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GridView.PageIndexChanged Zdarzenie

  • Odwołanie

Definicja

Przestrzeń nazw:
System.Web.UI.WebControls
Zestaw:
System.Web.dll

Występuje po kliknięciu jednego z przycisków pager, ale po kontrolce GridView obsługuje operację stronicowania.

public:
 event EventHandler ^ PageIndexChanged;
public event EventHandler PageIndexChanged;
member this.PageIndexChanged : EventHandler 
Public Custom Event PageIndexChanged As EventHandler

Typ zdarzenia

EventHandler

Przykłady

W poniższym przykładzie pokazano, jak za pomocą PageIndexChanged zdarzenia wyświetlić numer strony wybrany przez użytkownika z wiersza pager.


<%@ 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 CustomersGridView_DataBound(Object sender, EventArgs e)
  {
    if (!IsPostBack)
    {
      // Call a helper method to display the current page number 
      // when the page is first loaded.
      DisplayCurrentPage();
    }
  }

  void CustomersGridView_PageIndexChanged(Object sender, EventArgs e)
  {
    // Call a helper method to display the current page number 
    // when the user navigates to a different page.
    DisplayCurrentPage();
  }

  void DisplayCurrentPage()
  {
    // Calculate the current page number.
    int currentPage = CustomersGridView.PageIndex + 1;

    // Display the current page number. 
    Message.Text = "Page " + currentPage.ToString() + " of " + 
      CustomersGridView.PageCount.ToString() + ".";
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView PageIndexChanged Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView PageIndexChanged Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        allowpaging="true"
        ondatabound="CustomersGridView_DataBound"
        onpageindexchanged="CustomersGridView_PageIndexChanged"
        runat="server">
                
        <pagersettings mode="Numeric"
          position="Bottom"           
          pagebuttoncount="10"/>
                      
        <pagerstyle backcolor="LightBlue"/>
                
      </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="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </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 CustomersGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
      
    If Not IsPostBack Then
    
      ' Call a helper method to display the current page number 
      ' when the page is first loaded.
      DisplayCurrentPage()
      
    End If
    
  End Sub

  Sub CustomersGridView_PageIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
  
    ' Call a helper method to display the current page number 
    ' when the user navigates to a different page.
    DisplayCurrentPage()
  
  End Sub

  Sub DisplayCurrentPage()
  
    ' Calculate the current page number.
    Dim currentPage As Integer = CustomersGridView.PageIndex + 1

    ' Display the current page number. 
    Message.Text = "Page " & currentPage.ToString() & " of " & _
      CustomersGridView.PageCount.ToString() & "."
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView PageIndexChanged Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView PageIndexChanged Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        allowpaging="true"
        ondatabound="CustomersGridView_DataBound"
        onpageindexchanged="CustomersGridView_PageIndexChanged"
        runat="server">
                
        <pagersettings mode="Numeric"
          position="Bottom"           
          pagebuttoncount="10"/>
                      
        <pagerstyle backcolor="LightBlue"/>
                
      </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="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </form>
  </body>
</html>

Uwagi

Zdarzenie PageIndexChanged jest wywoływane po kliknięciu jednego z przycisków pager, ale po kontrolce GridView obsługuje operację stronicowania. Dzięki temu można podać metodę obsługi zdarzeń, która wykonuje niestandardową procedurę, taką jak niestandardowa operacja stronicowania, za każdym razem, gdy wystąpi to zdarzenie.

Aby określić indeks strony wybranej przez użytkownika, użyj PageIndex właściwości kontrolki GridView .

Aby uzyskać więcej informacji na temat obsługi zdarzeń, zobacz Obsługa i podnoszenie zdarzeń.

Dotyczy

Zobacz też