Guide pratique pour obtenir la valeur de retour d'une fonction de page

Cet exemple montre comment obtenir le résultat retourné par une fonction de page.

Exemple

Pour obtenir le résultat retourné à partir d’une fonction de page, vous devez gérer Return la fonction de page que vous appelez.

<Page x:Class="UsingPageFunctionsSample.CallingPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="CallingPage"
    >
    <Hyperlink Name="callPageFunctionHyperlink" Click="callPageFunctionHyperlink_Click">Call Page Function</Hyperlink>
</Page>

void callPageFunctionAndReturnHyperlink_Click(object sender, RoutedEventArgs e)
{
    // Call a page function and hook up page function's return event to get result
    GetStringPageFunction pageFunction = new GetStringPageFunction();
    pageFunction.Return += new ReturnEventHandler<String>(GetStringPageFunction_Returned);
    this.NavigationService.Navigate(pageFunction);
}
void GetStringPageFunction_Returned(object sender, ReturnEventArgs<String> e)
{
    // Get the result, if a result was passed.
    if (e.Result != null)
    {
        Console.WriteLine(e.Result);
    }
}

Private Sub callPageFunctionAndReturnHyperlink_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
    ' Call a page function and hook up page function's return event to get result
    Dim pageFunction As New GetStringPageFunction()
    AddHandler pageFunction.Return, AddressOf GetStringPageFunction_Returned
    Me.NavigationService.Navigate(pageFunction)
End Sub
Private Sub GetStringPageFunction_Returned(ByVal sender As Object, ByVal e As ReturnEventArgs(Of String))
    ' Get the result, if a result was passed.
    If e.Result IsNot Nothing Then
        Console.WriteLine(e.Result)
    End If
End Sub

Voir aussi

• PageFunction<T>