UWP System.StackOverflowException
我正在创建一个新闻提要来测试它,我使用combobox_selectionChanged event来激活此功能,当selectedItem=0显示世界标题,selectedItem=1显示体育标题,selectedItem=2将可见性更改为折叠。当您选择item0或更改为item1时,它可以工作,但一旦我更改为item2,它将显示system.StackOverflowException 这是我的密码`UWP System.StackOverflowException,uwp,unhandled-exception,Uwp,Unhandled Exception,我正在创建一个新闻提要来测试它,我使用combobox_selectionChanged event来激活此功能,当selectedItem=0显示世界标题,selectedItem=1显示体育标题,selectedItem=2将可见性更改为折叠。当您选择item0或更改为item1时,它可以工作,但一旦我更改为item2,它将显示system.StackOverflowException 这是我的密码` CancellationTokenSource cts = null; publi
CancellationTokenSource cts = null;
public async void NewsRepeat()
{
cts?.Cancel();
try
{
var localCts = cts = new CancellationTokenSource();
localCts.Token.ThrowIfCancellationRequested();
if (newsTpye.SelectedIndex == 0)
{
NewsPanel.Visibility = Visibility.Visible;
RootObject2 myNews = await NewsProxy.GetNews();
newsChannel.Text = "World Headlines";
for (k = 0; k <= 8; k++)
{
if (myNews.articles[k].title != null)
showTitle.Text = myNews.articles[k].title;
else
showTitle.Text = "";
if (myNews.articles[k].urlToImage != null)
newsImage.Source = new BitmapImage(new Uri(myNews.articles[k].urlToImage, UriKind.Absolute));
else
newsImage.Source = new BitmapImage(new Uri("ms-appx:///Assets/image/NoPic.jpg", UriKind.RelativeOrAbsolute));
if (myNews.articles[k].publishedAt != null)
showTime.Text = myNews.articles[k].publishedAt;
else
showTime.Text = "";
showDescription.Text = "(" + myNews.source + "): " + myNews.articles[k].description;
await Task.Delay(5000);
localCts.Token.ThrowIfCancellationRequested();
}
}
else if (newsTpye.SelectedIndex == 1)
{
NewsPanel.Visibility = Visibility.Visible;
RootObject3 mySportNews = await sportsNewsProxy.GetSportNews();
newsChannel.Text = "Sports Headlines";
for (k = 0; k <= 8; k++)
{
if (mySportNews.articles[k].title != null)
showTitle.Text = mySportNews.articles[k].title;
else
showTitle.Text = "";
if (mySportNews.articles[k].urlToImage != null)
newsImage.Source = new BitmapImage(new Uri(mySportNews.articles[k].urlToImage, UriKind.Absolute));
else
newsImage.Source = new BitmapImage(new Uri("ms-appx:///Assets/image/NoPic.jpg", UriKind.RelativeOrAbsolute));
if (mySportNews.articles[k].publishedAt != null)
showTime.Text = mySportNews.articles[k].publishedAt;
else
showTime.Text = "";
showDescription.Text = "(" + mySportNews.source + "): " + mySportNews.articles[k].description;
await Task.Delay(5000);
localCts.Token.ThrowIfCancellationRequested();
}
}
else if (newsTpye.SelectedIndex == 2)
{
NewsPanel.Visibility = Visibility.Collapsed;
}
NewsRepeat();
}
catch (OperationCanceledException)
{
// Swallow this exception only - this is probably
// the one we've thrown ourselves
}
}
private void newsType_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
NewsRepeat();
}`
CancellationTokenSource cts=null;
公共异步void newsreat()
{
cts?.Cancel();
尝试
{
var localCts=cts=new CancellationTokenSource();
localCts.Token.ThrowIfCancellationRequested();
如果(newsTpye.SelectedIndex==0)
{
NewsPanel.Visibility=Visibility.Visible;
RootObject2 myNews=await NewsProxy.GetNews();
newscannel.Text=“世界新闻标题”;
对于(k=0;k每次调用一个方法时,都会增加堆栈的使用率。当选择了dex==2
时,您的方法只会一次又一次地调用自身,导致堆栈溢出
你能教我怎么出去吗
使用return
语句
另一方面,您应该使用async Task
async void
主要用于事件处理程序。如何以及何时退出newsreat()
method?我想知道为什么在另外两种情况下没有StackOverflow。@ravi kumar实际上从来没有,我只是简单地隐藏这个面板,你能教我如何退出吗?它可以工作,非常感谢,我认为使用forever loop重复10条新闻非常糟糕(这个API只给出10条头条新闻),有时会导致许多问题,有什么想法我可以改进它吗?我不知道为什么代码会调用自己。你应该通过一个API调用获得所有10个标题。