DetailsViewUpdateEventArgs.NewValues Property
Definition
Important
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Gets a dictionary that contains the new field name/value pairs for the record to update.
public:
property System::Collections::Specialized::IOrderedDictionary ^ NewValues { System::Collections::Specialized::IOrderedDictionary ^ get(); };public System.Collections.Specialized.IOrderedDictionary NewValues { get; }member this.NewValues : System.Collections.Specialized.IOrderedDictionaryPublic ReadOnly Property NewValues As IOrderedDictionaryProperty Value
An IOrderedDictionary that contains a dictionary of the new field name/value pairs for the record to update.
Examples
The following code example demonstrates how to use the NewValues property to access the new values entered by the user for the non-key fields of the record being updated.
<%@ 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_ItemUpdated(Object sender,
DetailsViewUpdatedEventArgs e)
{
// Use the Exception property to determine whether an exception
// occurred during the insert operation.
if (e.Exception == null)
{
// Use the Values property to get the value entered by
// the user for the CompanyName field.
String keyFieldValue = e.Keys["CustomerID"].ToString();
// Display a confirmation message.
MessageLabel.Text = "Record " + keyFieldValue +
" updated successfully. ";
// Display the old and new values.
DisplayValues(e);
if (e.AffectedRows == 1)
{
MessageLabel.Text += e.AffectedRows.ToString() +
" record updated.";
}
else
{
MessageLabel.Text += e.AffectedRows.ToString() +
" records updated.";
}
}
else
{
// Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message;
// Use the ExceptionHandled property to indicate that the
// exception is already handled.
e.ExceptionHandled = true;
// When an exception occurs, keep the DetailsView
// control in edit mode.
e.KeepInEditMode = true;
}
}
void DisplayValues(DetailsViewUpdatedEventArgs e)
{
MessageLabel.Text += "<br/></br>";
// Iterate through the OldValue and NewValues
// properties and display the values.
for (int i = 0; i < e.OldValues.Count; i++)
{
MessageLabel.Text += "Old Value=" + e.OldValues[i].ToString() +
", New Value=" + e.NewValues[i].ToString() + "<br/>";
}
MessageLabel.Text += "</br>";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewUpdatedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewUpdatedEventArgs Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
autogenerateeditbutton="true"
allowpaging="true"
datakeynames="CustomerID"
onitemupdated="CustomerDetailsView_ItemUpdated"
runat="server">
<pagersettings position="Bottom"/>
</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]"
updatecommand="Update [Customers] Set
[CompanyName]=@CompanyName, [Address]=@Address,
[City]=@City, [PostalCode]=@PostalCode,
[Country]=@Country
Where [CustomerID]=@CustomerID"
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_ItemUpdated(ByVal sender As Object, ByVal e As DetailsViewUpdatedEventArgs)
' Use the Exception property to determine whether an exception
' occurred during the insert operation.
If e.Exception Is Nothing Then
' Use the Values property to get the value entered by
' the user for the CompanyName field.
Dim keyFieldValue As String = e.Keys("CustomerID").ToString()
' Display a confirmation message.
MessageLabel.Text = "Record " & keyFieldValue & _
" updated successfully. "
' Display the old and new values.
DisplayValues(e)
If e.AffectedRows = 1 Then
MessageLabel.Text &= e.AffectedRows.ToString() & _
" record updated."
Else
MessageLabel.Text &= e.AffectedRows.ToString() & _
" records updated."
End If
Else
' Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message
' Use the ExceptionHandled property to indicate that the
' exception is already handled.
e.ExceptionHandled = True
' When an exception occurs, keep the DetailsView
' control in edit mode.
e.KeepInEditMode = True
End If
End Sub
Sub DisplayValues(ByVal e As DetailsViewUpdatedEventArgs)
MessageLabel.Text &= "<br/></br>"
' Iterate through the OldValue and NewValues
' properties and display the values.
Dim i As Integer
For i = 0 To e.OldValues.Count - 1
MessageLabel.Text &= "Old Value=" & e.OldValues(i).ToString() & _
", New Value=" & e.NewValues(i).ToString() & "<br/>"
Next
MessageLabel.Text &= "</br>"
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewUpdatedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewUpdatedEventArgs Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
autogenerateeditbutton="true"
allowpaging="true"
datakeynames="CustomerID"
onitemupdated="CustomerDetailsView_ItemUpdated"
runat="server">
<pagersettings position="Bottom"/>
</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]"
updatecommand="Update [Customers] Set
[CompanyName]=@CompanyName, [Address]=@Address,
[City]=@City, [PostalCode]=@PostalCode,
[Country]=@Country
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Remarks
Use the NewValues property to access the new field values for the record to update. For example, you can use these values to keep a log of updated records.
Note
This property does not contain the key fields. To access the key fields, use the Keys property. You can also access the original field values by using the OldValues property.
The NewValues property returns an object that implements the IOrderedDictionary interface. The object contains DictionaryEntry objects that represent the fields of the record to update.
Note
As a shortcut, you can also use the indexer of the IOrderedDictionary object to access the field values directly.
Applies to
See also
Werk met ons samen op GitHub
De bron voor deze inhoud vindt u op GitHub, waar u ook problemen en pull-aanvragen kunt maken en bekijken. Raadpleeg onze gids voor inzenders voor meer informatie.
