DetailsView.DataItemIndex Eigenschaft

Referenz

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Wichtig

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Ruft den Index des Elements, das in einem DetailsView-Steuerelement angezeigt wird, aus der zugrunde liegenden Datenquelle ab.

public:
 virtual property int DataItemIndex { int get(); };

[System.ComponentModel.Browsable(false)]
public virtual int DataItemIndex { get; }

[<System.ComponentModel.Browsable(false)>]
member this.DataItemIndex : int

Public Overridable ReadOnly Property DataItemIndex As Integer

Eigenschaftswert

Int32

Der nullbasierte Index des Datenelements aus der zugrunde liegenden Datenquelle, das in einem DetailsView-Steuerelement angezeigt wird.

Attribute: BrowsableAttribute

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die DataItemIndex -Eigenschaft verwendet wird, um den Index des aktuellen Elements in der Datenquelle zu bestimmen. Dieser Wert wird verwendet, um die aktuelle Seitenzahl in einem Label Steuerelement anzuzeigen, das in einer benutzerdefinierten Pagerzeile enthalten ist.

<%@ 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>

Hinweise

Wenn das Auslagerungsfeature aktiviert ist (durch Festlegen der AllowPaging -Eigenschaft auf true), verwenden Sie die DataItemIndex -Eigenschaft, um den Index des derzeit angezeigten Datensatzes zu bestimmen. Sie können diese Eigenschaft auch verwenden, um den angezeigten Datensatz programmgesteuert zu ändern.

Hinweis

Wenn die Pagingfunktion aktiviert ist, können Sie diese Eigenschaft auch verwenden, um die Seitenzahl des angezeigten Datensatzes zu bestimmen. Beachten Sie jedoch, dass diese Eigenschaft nullbasiert ist.

Verwenden Sie DataItemCount die -Eigenschaft, um die Gesamtzahl der Elemente in der Datenquelle zu bestimmen.

Gilt für:

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