如何从其他页面Windows Phone调用事件？

Question

我为Windows Phone制作了一个上传应用程序，该功能在B类（SecondPage），我有一个上传任务，当这个任务完成时，它调用一个事件并通知A类（MainPage）该任务是完成并做了一些事情，环顾网站，我找到了一些解决方案，但他们没有多大帮助（只是我认为）。

1. Notify when event from another class is triggered

2. Raise an event of a class from a different class in C#

3. Understanding events and event handlers in C#

4. C# event handling (compared to Java)

5. C#: Need one of my classes to trigger an event in another class to update a text box

以下是我在SecondPage中的代码

if (order != null)
{
    name += " " + order + extension;
}
else
{
    name += extension;
}

在MainClass中

public sealed partial class SecondPage : Page
{
    public event EventHandler clearHandler = delegate { };
    public SecondPage()
    {
        this.InitializeComponent();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
    }

    private void btnClear_Tapped(object sender, TappedRoutedEventArgs e)
    {
        //some works
        if (clearHandler != null)
            clearHandler(this, null);
    }
}

没有清除名为txt的TextBox，你能帮助我吗，谢谢！

Answer 1

you can use ObservableCollection for notify one page to another.


public static ObservableCollection<string> YesNoStatus { get; internal set; }

你要通知

YesNoStatus = new ObservableCollection<string>();
        YesNoStatus.CollectionChanged += YesNoStatus_CollectionChanged;

及其事件方法如： -

private void YesNoStatus_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        ObservableCollection<string> obsSender = sender as ObservableCollection<string>;
    }

在操作完成后在此集合中添加内容..它将通知。