Como retornar de uma função de página

Este exemplo mostra como retornar um resultado de uma função de página.

Exemplo

Para retornar de uma função de página, você precisa chamar OnReturn e passar uma instância de ReturnEventArgs<T>.

<PageFunction
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib" 
    x:Class="UsingPageFunctionsSample.GetStringPageFunction"
    x:TypeArguments="sys:String"
    Title="GetStringPageFunction">

</PageFunction>

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));
    }
}

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

Consulte também

• PageFunction<T>