Muokkaa

Jaa

GridView.PageIndexChanged Event

  • Reference

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Occurs when one of the pager buttons is clicked, but after the GridView control handles the paging operation.

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

Event Type

EventHandler

Examples

The following example demonstrates how to use the PageIndexChanged event to display the page number selected by the user 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 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>

Remarks

The PageIndexChanged event is raised when one of the pager buttons is clicked, but after the GridView control handles the paging operation. This enables you to provide an event-handling method that performs a custom routine, such as a custom paging operation, whenever this event occurs.

To determine the index of the page selected by the user, use the PageIndex property of the GridView control.

For more information about how to handle events, see Handling and Raising Events.

Applies to

See also