DetailsView.SelectedValue DetailsView.SelectedValue DetailsView.SelectedValue DetailsView.SelectedValue Property

Definizione

Ottiene il valore della chiave dati del record corrente in un controllo DetailsView.Gets the data key value of the current record in a DetailsView control.

public:
 property System::Object ^ SelectedValue { System::Object ^ get(); };
[System.ComponentModel.Browsable(false)]
public object SelectedValue { get; }
member this.SelectedValue : obj
Public ReadOnly Property SelectedValue As Object

Valore della proprietà

Il valore della chiave dati del record corrente in un controllo DetailsView.The data key value of the current record in a DetailsView control.

Esempi

Nell'esempio di codice riportato di seguito viene illustrato SelectedValue come utilizzare la proprietà per determinare il valore della chiave di dati per il record corrente.The following code example demonstrates how to use the SelectedValue property to determine the data key value for the current record.


<%@ 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 CustomerDetailView_ItemUpdated(Object sender, DetailsViewUpdatedEventArgs e)
  {
    // Log the update operation using the key value contained
    // in the SelectedValue property.
      String keyValue = CustomerDetailView.SelectedValue.ToString();
    LogUpdate(keyValue);
  }

  void LogUpdate(String keyValue)
  {
    // Insert code to log the update operation.
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsView SelectedValue Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DetailsView SelectedValue Example</h3>
                
        <asp:detailsview id="CustomerDetailView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneraterows="true"
          autogenerateeditbutton="true" 
          allowpaging="true"
          onitemupdated="CustomerDetailView_ItemUpdated" 
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </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]"
                        UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, 
            [Address] = @Address, [City] = @City,
            [PostalCode] = @PostalCode, [Country] = @Country
            WHERE [CustomerID] = @CustomerID">
        </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">

    Sub CustomerDetailView_ItemUpdated(ByVal sender As Object, ByVal e As DetailsViewUpdatedEventArgs)
        ' Log the update operation using the key value contained
        ' in the SelectedValue property.
        Dim keyValue As String = CustomerDetailView.SelectedValue.ToString()
        LogUpdate(keyValue)

    End Sub

    Sub LogUpdate(ByVal keyValue As String)
        ' Insert code to log the update operation.
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView SelectedValue Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView SelectedValue Example</h3>
        <asp:DetailsView ID="CustomerDetailView" DataSourceID="DetailsViewSource" DataKeyNames="CustomerID"
            AutoGenerateRows="true" AutoGenerateEditButton="true" AllowPaging="true" OnItemUpdated="CustomerDetailView_ItemUpdated"
            runat="server">
            <FieldHeaderStyle BackColor="Navy" ForeColor="White" />
        </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]"
            UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, 
            [Address] = @Address, [City] = @City,
            [PostalCode] = @PostalCode, [Country] = @Country
            WHERE [CustomerID] = @CustomerID"></asp:SqlDataSource>
    </form>
</body>
</html>

Commenti

Utilizzare la SelectedValue proprietà per determinare il valore della chiave di dati per il record corrente.Use the SelectedValue property to determine the data key value for the current record. Per recuperare l'oggetto System.Web.UI.WebControls.DataKey effettivo che rappresenta la chiave dati per il record, utilizzare la DataKey proprietà.To retrieve the actual System.Web.UI.WebControls.DataKey object that represents the data key for the record, use the DataKey property.

Questa proprietà è la proprietà predefinita a cui ControlParameter viene associato un oggetto in fase di esecuzione.This property is the default property that a ControlParameter object binds to at run time. Per ulteriori informazioni, vedere ControlValuePropertyAttribute, ControlParametere utilizzo di parametri con i controlli origine dati per l'applicazione di filtri.For more information, see ControlValuePropertyAttribute, ControlParameter, and Using Parameters with Data Source Controls for Filtering.

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