DataKey.Values Eigenschap
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee haalt u een IOrderedDictionary object op dat elk sleutelveld in het DataKey object bevat.
public:
virtual property System::Collections::Specialized::IOrderedDictionary ^ Values { System::Collections::Specialized::IOrderedDictionary ^ get(); };public virtual System.Collections.Specialized.IOrderedDictionary Values { get; }member this.Values : System.Collections.Specialized.IOrderedDictionaryPublic Overridable ReadOnly Property Values As IOrderedDictionaryWaarde van eigenschap
Een IOrderedDictionary met elk sleutelveld in de DataKey.
Voorbeelden
In het volgende codevoorbeeld ziet u hoe u het IOrderedDictionary object dat door de Values eigenschap wordt geretourneerd, doorloopt.
<%@ 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 CustomerDetailsView_DataBound(Object sender, EventArgs e)
{
// Retrieve the IOrderedDictionary object that contains the key field values.
IOrderedDictionary allKeysDictionary = CustomerDetailsView.DataKey.Values;
// Display the value of the key fields.
MessageLabel.Text = "The key field values for the displayed record are: <br/><br/>";
foreach (DictionaryEntry entry in allKeysDictionary)
{
MessageLabel.Text += "Key=" + entry.Key.ToString() +
", Value=" + entry.Value.ToString() + "<br/>";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataKey Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataKey Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
datakeynames="CustomerID, CompanyName, PostalCode"
allowpaging="true"
ondatabound="CustomerDetailsView_DataBound"
runat="server">
</asp:detailsview>
<br/>
<asp:label id="MessageLabel"
forecolor="Red"
runat="server"/>
<!-- 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"
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 CustomerDetailsView_DataBound(ByVal sender As Object, ByVal e As EventArgs) Handles CustomerDetailsView.DataBound
' Retrieve the IOrderedDictionary object that contains the key field values.
Dim allKeysDictionary As IOrderedDictionary = CustomerDetailsView.DataKey.Values
' Display the value of the key fields.
MessageLabel.Text = "The key field values for the displayed record are: <br/><br/>"
' In Visual Basic, the DictionaryEntry objects contained in the
' allKeysDictionary object must be copied to an array before
' you can iterate through the items.
Dim allKeysArray(allKeysDictionary.Count - 1) As DictionaryEntry
allKeysDictionary.CopyTo(allKeysArray, 0)
Dim entry As DictionaryEntry
For Each entry In allKeysArray
MessageLabel.Text &= "Key=" & entry.Key.ToString() & _
", Value=" & entry.Value.ToString() & "<br/>"
Next
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataKey Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataKey Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
datakeynames="CustomerID, CompanyName, PostalCode"
allowpaging="true"
runat="server">
</asp:detailsview>
<br/>
<asp:label id="MessageLabel"
forecolor="Red"
runat="server"/>
<!-- 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"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Opmerkingen
Gebruik de Values eigenschap om een IOrderedDictionary object op te halen dat elk sleutelveld in het DataKey object bevat. Het IOrderedDictionary object wordt vaak gebruikt om de sleutelvelden van een record te doorlopen.
