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我用下面的代码操纵事件backpressed,但它不工作事件backpressed WP 8.1
private void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
{
Frame frame = Window.Current.Content as Frame;
if (frame == null)
{
return;
}
if (frame.CanGoBack)
{
frame.GoBack();
e.Handled = true;
}
它返回此错误:
Error 1 The type or namespace name 'BackPressedEventArgs' could not be found (are you missing a using directive or an assembly reference?)
谁能帮助我,或点我在正确的方向?