如何：获取页函数的返回值How to: Get the Return Value of a Page Function

03/30/2017

本文内容

本示例显示如何获取页函数的返回值。This example shows how to get the result that is returned by a page function.

示例Example

若要获取从 page 函数返回的结果，需要处理要 Return 调用的 page 函数。To get the result that is returned from a page function, you need to handle Return of the page function you are calling.

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="CallingPage"

>

Call Page Function

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(GetStringPageFunction_Returned);

this.NavigationService.Navigate(pageFunction);

}

void GetStringPageFunction_Returned(object sender, ReturnEventArgs 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

另请参阅See also