FormView.PageIndex Proprietà

Definizione

Ottiene o imposta l'indice della pagina visualizzata.

public:
 virtual property int PageIndex { int get(); void set(int value); };
[System.ComponentModel.Bindable(true)]
public virtual int PageIndex { get; set; }
[<System.ComponentModel.Bindable(true)>]
member this.PageIndex : int with get, set
Public Overridable Property PageIndex As Integer

Valore della proprietà

L'indice in base zero dell'elemento di dati visualizzato in un controllo FormView dall'origine dati sottostante.

Attributi

Eccezioni

Il valore selezionato è minore di -1.

Esempio

Nell'esempio seguente viene illustrato come usare la PageIndex proprietà per determinare l'indice di pagina del record visualizzato.


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

    // Get the pager row.
    FormViewRow pagerRow = EmployeeFormView.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 = EmployeeFormView.PageIndex + 1;
      int count = EmployeeFormView.PageCount;

      pageNum.Text = page.ToString();
      totalNum.Text = count.ToString();
    }    

  }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>FormView PagerTemplate Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>FormView PagerTemplate Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        ondatabound="EmployeeFormView_DataBound" 
        runat="server">
        
        <itemtemplate>
          <table>
            <tr>
              <td>
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td>
                <h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>      
                <%# Eval("Title") %>        
              </td>
            </tr>
          </table>    
        </itemtemplate>
        
        <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>
          
        <pagersettings position="Bottom"
          mode="NextPrevious"/> 
                  
      </asp:formview>
          
      <!-- 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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
        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 EmployeeFormView_DataBound(ByVal sender As Object, ByVal e As EventArgs)

    ' Get the pager row.
    Dim pagerRow As FormViewRow = EmployeeFormView.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 = EmployeeFormView.PageIndex + 1
      Dim count As Integer = EmployeeFormView.PageCount

      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>FormView PagerTemplate Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>FormView PagerTemplate Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        ondatabound="EmployeeFormView_DataBound" 
        runat="server">
        
        <itemtemplate>
          <table>
            <tr>
              <td>
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td>
                <h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3>      
                <%# Eval("Title") %>        
              </td>
            </tr>
          </table>    
        </itemtemplate>
        
        <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>
          
        <pagersettings position="Bottom"
          mode="NextPrevious"/> 
                  
      </asp:formview>
          
      <!-- 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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </form>
  </body>
</html>

Commenti

Quando la funzionalità di paging è abilitata (quando la AllowPaging proprietà è impostata su true), utilizzare la PageIndex proprietà per determinare l'indice del record attualmente visualizzato. È anche possibile usare questa proprietà per modificare a livello di codice il record visualizzato.

Nota

Quando la funzionalità di paging è abilitata, è anche possibile usare questa proprietà per determinare il numero di pagina del record visualizzato; tuttavia, tenere presente che questa proprietà è basata su zero.

Per determinare il numero totale di elementi nell'origine dati, usare la PageCount proprietà .

Si applica a

Vedi anche