DetailsView.DataItemIndex DetailsView.DataItemIndex DetailsView.DataItemIndex DetailsView.DataItemIndex Property

Definizione

Ottiene l'indice dell'elemento visualizzato in un controllo DetailsView dall'origine dati sottostante.Gets the index of the item being displayed in a DetailsView control from the underlying data source.

public:
 virtual property int DataItemIndex { int get(); };
[System.ComponentModel.Browsable(false)]
public virtual int DataItemIndex { get; }
member this.DataItemIndex : int
Public Overridable ReadOnly Property DataItemIndex As Integer

Valore della proprietà

L'indice in base zero dell'elemento di dati visualizzato in un controllo DetailsView dall'origine dati sottostante.The zero-based index of the data item being displayed in a DetailsView control from the underlying data source.

Implementazioni

Esempi

Nell'esempio di codice riportato di seguito viene illustrato DataItemIndex come utilizzare la proprietà per determinare l'indice dell'elemento corrente nell'origine dati.The following code example demonstrates how to use the DataItemIndex property to determine the index of the current item in the data source. Questo valore viene utilizzato per visualizzare il numero di pagina corrente in Label un controllo contenuto in una riga di cercapersone personalizzata.This value is used to display the current page number in a Label control contained in a custom 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">

    protected void CustomerDetailView_DataBound(object sender, EventArgs e)
    {

      // Get the pager row.
      DetailsViewRow pagerRow = CustomerDetailView.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 = CustomerDetailView.DataItemIndex + 1;
          int count = CustomerDetailView.DataItemCount;

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

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DetailsView PagerTemplate Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DetailsView PagerTemplate Example</h3>
                
        <!-- Notice that the LinkButton controls in the pager   -->
        <!-- template have their CommandName properties set.    -->
        <!-- The DetailsView control automatically recognizes   -->
        <!-- certain command names and performs the appropriate -->
        <!-- operation. In this example, the CommandName        -->
        <!-- properties are set "Page" and the CommandArgument  -->
        <!-- properties are set to "Next" and "Prev", which     -->
        <!-- causes the DetailsView control to navigate to the  -->
        <!-- next and previous record, respectively.            -->        
        <asp:detailsview id="CustomerDetailView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true" 
          allowpaging="true"
        
          runat="server" OnDataBound="CustomerDetailView_DataBound">
               
          <headerstyle backcolor="Navy"
            forecolor="White"/>
            
          <pagerstyle VerticalAlign="Bottom" />
            
          <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>   
                    
        </asp:detailsview>
        
        <!-- 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">

    Protected Sub CustomerDetailView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
        ' Get the pager row.
        Dim pagerRow As DetailsViewRow = CustomerDetailView.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 = CustomerDetailView.DataItemIndex + 1
            Dim count As Integer = CustomerDetailView.DataItemCount

            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>DetailsView PagerTemplate Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DetailsView PagerTemplate Example</h3>
                
        <!-- Notice that the LinkButton controls in the pager   -->
        <!-- template have their CommandName properties set.    -->
        <!-- The DetailsView control automatically recognizes   -->
        <!-- certain command names and performs the appropriate -->
        <!-- operation. In this example, the CommandName        -->
        <!-- properties are set "Page" and the CommandArgument  -->
        <!-- properties are set to "Next" and "Prev", which     -->
        <!-- causes the DetailsView control to navigate to the  -->
        <!-- next and previous record, respectively.            -->        
        <asp:detailsview id="CustomerDetailView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true" 
          allowpaging="true"
        
          runat="server" OnDataBound="CustomerDetailView_DataBound">
               
          <headerstyle backcolor="Navy"
            forecolor="White"/>
            
          <pagerstyle VerticalAlign="Bottom" />
            
          <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>   
                    
        </asp:detailsview>
        
        <!-- 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>

Commenti

Quando la funzionalità di paging è abilitata (impostando AllowPaging la trueproprietà su), DataItemIndex utilizzare la proprietà per determinare l'indice del record attualmente visualizzato.When the paging feature is enabled (by setting the AllowPaging property to true), use the DataItemIndex property to determine the index of the currently displayed record. È anche possibile usare questa proprietà per modificare a livello di codice il record visualizzato.You can also use this property to programmatically change the displayed record.

Nota

Quando la funzionalità di paging è abilitata, è possibile usare questa proprietà anche per determinare il numero di pagina del record visualizzato; Tuttavia, tenere presente che questa proprietà è in base zero.When the paging feature is enabled, you can also use this property to determine the page number of the record displayed; however, be aware that this property is zero-based.

Per determinare il numero totale di elementi nell'origine dati, utilizzare la DataItemCount proprietà.To determine the total number of items in the data source, use the DataItemCount property.

Si applica a

Vedi anche