Question

我在我的项目（Coding4Fun.Toolkit）中使用API来显示带有文本框的messageBox。因此，当我拨打MessagePrompt代码时，它不会在正确的时间运行。

private void holdListAdd(object sender, System.Windows.Input.GestureEventArgs)
{
    var dc = ((FrameworkElement)sender).DataContext;
    Fields fi = (Fields)dc;

    if (List2.Items.Contains(fi))
    {
        MessageBox.Show("Esse item já foi adicionado!");
    }
    else
    {
        MessagePrompt messagePrompt = new MessagePrompt();

        messagePrompt.Body = new BodyUserControl();
        messagePrompt.Show();

        IsolatedStorageSettings iso = IsolatedStorageSettings.ApplicationSettings;
        if (iso.TryGetValue<string>("isoQuantity", out retornaNome))
        {
            qtd = retornaNome;
        }
        fi.Quantity = qtd;

        List2.Items.Add(fi);
        MessageBox.Show("Item Adicionado com sucesso!");
    }

请注意，在holdListAdd中，最后一个代码为List2.Items.Add(fi);，但它在MessagePrompt之前运行。为什么呢？

BodyUserControl.xaml：

<StackPanel x:Name="LayoutRoot" Background="{StaticResource PhoneChromeBrush}"  Margin="0,0,0,10">
    <Grid Height="157">
        <TextBlock HorizontalAlignment="Center" Margin="55,0,51,86" Width="374">
            <Run Text="       "/>
            <Run Text="Digite a quantidade a adicionar:"/>
        </TextBlock>
        <TextBox TextWrapping="Wrap" Name="Quantity" Margin="103,68,222,17"/>
        <Button Content="Adicionar" HorizontalAlignment="Left" Margin="225,68,0,0" VerticalAlignment="Top" Name="addQuantity" Click="addQuantity_Click"/>
    </Grid>
</StackPanel>

BodyUserControl.cs：

public partial class BodyUserControl : PhoneApplicationPage
{
    public BodyUserControl()
    {
        InitializeComponent();
    }

    private void addQuantity_Click(object sender, RoutedEventArgs e)
    {
        IsolatedStorageSettings iso = IsolatedStorageSettings.ApplicationSettings;
        {
            if (iso.Contains("isoQuantity"))
            {
                iso["isoQuantity"] = Quantity.Text;
            }
            else
            {
                iso.Add("isoQuantity", Quantity.Text);
            }
        }
    }

Answer 1

这是因为您的代码会在显示MessagePrompt时继续。如果您想在MessagePrompt完成后执行某些操作，则必须将事件处理程序分配给MessagePrompt.Completed。像

这样的东西

messagePrompt.Completed += messagePrompt_Completed;
messagePrompt.Show();

void messagePrompt_Completed(object sender, PopUpEventArgs<object, PopUpResult> e)
{
    IsolatedStorageSettings iso = IsolatedStorageSettings.ApplicationSettings;
    if (iso.TryGetValue<string>("isoQuantity", out retornaNome))
    {
        qtd = retornaNome;
    }
    fi.Quantity = qtd;

    List2.Items.Add(fi);
    MessageBox.Show("Item Adicionado com sucesso!");
};

我的代码没有在“序列”中运行

1 个答案: