GridView.DataKeys Eigenschaft

Definition

Ruft eine Auflistung von DataKey-Objekten ab, die den Datenschlüsselwert der einzelnen Zeilen in einem GridView-Steuerelement darstellen.Gets a collection of DataKey objects that represent the data key value of each row in a GridView control.

public:
 virtual property System::Web::UI::WebControls::DataKeyArray ^ DataKeys { System::Web::UI::WebControls::DataKeyArray ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.DataKeyArray DataKeys { get; }
member this.DataKeys : System.Web.UI.WebControls.DataKeyArray
Public Overridable ReadOnly Property DataKeys As DataKeyArray

Eigenschaftswert

Ein DataKeyArray, das den Datenschlüssel der einzelnen Zeilen in einem GridView-Steuerelement enthält.A DataKeyArray that contains the data key of each row in a GridView control.

Implementiert

Attribute

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie die DataKeys -Eigenschaft verwendet wird, um den Datenschlüssel Wert der ausgewählten Zeile GridView in einem-Steuerelement zu bestimmen.The following example demonstrates how to use the DataKeys property to determine the data key value of the selected row in a GridView control.


<%@ 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_SelectedIndexChanged(Object sender, EventArgs e)
  {
    
    // Determine the index of the selected row.
    int index = CustomersGridView.SelectedIndex;
        
    // Display the primary key value of the selected row.
    Message.Text = "The primary key value of the selected row is " +
        CustomersGridView.DataKeys[index].Value.ToString() + ".";
    
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView DataKeys Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView DataKeys Example</h3>

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
               
      <br/><br/>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        autogenerateselectbutton="true"    
        datakeynames="CustomerID"
        onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
        runat="server">
                
      </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_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
      
    ' Determine the index of the selected row.
    Dim index As Integer = CustomersGridView.SelectedIndex
        
    ' Display the primary key value of the selected row.
    Message.Text = "The primary key value of the selected row is " & _
        CustomersGridView.DataKeys(index).Value.ToString() & "."
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView DataKeys Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView DataKeys Example</h3>

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
               
      <br/><br/>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        autogenerateselectbutton="true"    
        datakeynames="CustomerID"
        onselectedindexchanged="CustomersGridView_SelectedIndexChanged"
        runat="server">
                
      </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>

Hinweise

Wenn die DataKeyNames -Eigenschaft festgelegt ist GridView , erstellt das- DataKey Steuerelement automatisch ein-Objekt für jede Zeile im-Steuerelement.When the DataKeyNames property is set, the GridView control automatically creates a DataKey object for each row in the control. Das DataKey -Objekt enthält die Werte des Felds bzw. der Felder, DataKeyNames die in der-Eigenschaft angegeben sind.The DataKey object contains the values of the field or fields specified in the DataKeyNames property. Die DataKey -Objekte werden dann der- DataKeys Auflistung des-Steuer Elements hinzugefügt.The DataKey objects are then added to the control's DataKeys collection. Verwenden Sie DataKeys die-Eigenschaft, DataKey um das-Objekt für eine GridView bestimmte Daten Zeile im-Steuerelement abzurufen.Use the DataKeys property to retrieve the DataKey object for a specific data row in the GridView control.

Hinweis

Mit der SelectedDataKey -Eigenschaft können Sie das DataKey -Objekt für die aktuell ausgewählte Zeile abrufen.You can use the SelectedDataKey property to retrieve the DataKey object for the currently selected row. Sie können auch die SelectedValue -Eigenschaft verwenden, um den Datenschlüssel Wert für die aktuell ausgewählte Zeile direkt abzurufen.You can also use the SelectedValue property to retrieve the data key value for the currently selected row directly.

Gilt für:

Siehe auch