Procedura: restituire un risultato da una funzione di pagina
In questo esempio viene mostrato come restituire un risultato da una funzione di pagina.
Esempio
Per restituire un risultato da una funzione di pagina, è necessario chiamare OnReturn e passare un'istanza di ReturnEventArgs<T>.
<PageFunction
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
x:Class="UsingPageFunctionsSample.GetStringPageFunction"
x:TypeArguments="sys:String"
Title="GetStringPageFunction">
...
</PageFunction>
Partial Public Class GetStringPageFunction
Inherits PageFunction(Of String)
Public Sub New()
InitializeComponent()
End Sub
Public Sub New(ByVal initialValue As String)
Me.New()
Me.stringTextBox.Text = initialValue
End Sub
Private Sub okButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
' Page function is accepted, so return a result
OnReturn(New ReturnEventArgs(Of String)(Me.stringTextBox.Text))
End Sub
Private Sub cancelButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
' Page function is cancelled, so don't return a result
OnReturn(New ReturnEventArgs(Of String)(Nothing))
End Sub
End Class
public partial class GetStringPageFunction : PageFunction<String>
{
public GetStringPageFunction()
{
InitializeComponent();
}
public GetStringPageFunction(string initialValue) : this()
{
this.stringTextBox.Text = initialValue;
}
void okButton_Click(object sender, RoutedEventArgs e)
{
// Page function is accepted, so return a result
OnReturn(new ReturnEventArgs<string>(this.stringTextBox.Text));
}
void cancelButton_Click(object sender, RoutedEventArgs e)
{
// Page function is cancelled, so don't return a result
OnReturn(new ReturnEventArgs<string>(null));
}
}