DetailsView.SelectedValue Eigenschap

Definitie

Naamruimte:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Hiermee haalt u de waarde van de gegevenssleutel van de huidige record op in een DetailsView besturingselement.

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

Waarde van eigenschap

Object

De gegevenssleutelwaarde van de huidige record in een DetailsView besturingselement.

Kenmerken
BrowsableAttribute

Voorbeelden

In het volgende codevoorbeeld ziet u hoe u de SelectedValue eigenschap gebruikt om de waarde van de gegevenssleutel voor de huidige record te bepalen.


<%@ 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>

Opmerkingen

Gebruik de SelectedValue eigenschap om de waarde van de gegevenssleutel voor de huidige record te bepalen. Als u het werkelijke System.Web.UI.WebControls.DataKey object wilt ophalen dat de gegevenssleutel voor de record vertegenwoordigt, gebruikt u de DataKey eigenschap.

Deze eigenschap is de standaardeigenschap waaraan een ControlParameter object tijdens runtime wordt gekoppeld. Zie en ControlParameterParameters gebruiken met besturingselementen voor gegevensbronnen voor filteren voor meer informatieControlValuePropertyAttribute.

Van toepassing op

Zie ook