跳过675帧!该应用程序可能在其主线程上做过多的工作.如何在不冻结UI的情况下使应用程序在后台运行? [英] Skipped 675 frames! The application may be doing too much work on its main thread. How to make app run process in background without freezing the UI?
本文介绍了跳过675帧!该应用程序可能在其主线程上做过多的工作.如何在不冻结UI的情况下使应用程序在后台运行?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个新闻聚合器,在调试中,我有以下内容: 跳过675帧!该应用程序可能在其主线程上做过多的工作. 我仅从12个站点加载.有没有办法在不冻结整个应用程序的情况下在后台完成所有这些加载?
I have an news aggregator and in debug i have the following: Skipped 675 frames! The application may be doing too much work on its main thread. I am loading only from 12 sites. Is there a way to to do all this loading in background without the whole app freezing?
得到一个新闻的方法
public async static Task<NewsContent> oneNews(string category,string site)
{
if(sites.Count==0)
addElements();
GetNews gn = new GetNews(site,false);
Random rn = new Random();
var s = await gn.news(rn.Next(0,2));
return s;
}
GetNews类:
class GetNews
{
string url;
bool isMultiple;
public GetNews(string url,bool isMultiple)
{
this.url = url;
this.isMultiple = isMultiple;
}
public async Task<NewsContent> news(int i)
{
List<NewsContent> feedItemsList = new List<NewsContent>();
try
{
WebRequest webRequest = WebRequest.Create(url);
WebResponse webResponse = webRequest.GetResponse();
Stream stream = webResponse.GetResponseStream();
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(stream);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDocument.NameTable);
nsmgr.AddNamespace("dc", xmlDocument.DocumentElement.GetNamespaceOfPrefix("dc"));
nsmgr.AddNamespace("content", xmlDocument.DocumentElement.GetNamespaceOfPrefix("content"));
XmlNodeList itemNodes = xmlDocument.SelectNodes("rss/channel/item");
NewsContent feedItem = new NewsContent();
if (itemNodes[i].SelectSingleNode("title") != null)
{
feedItem.title = itemNodes[i].SelectSingleNode("title").InnerText;
}
if (itemNodes[i].SelectSingleNode("link") != null)
{
feedItem.url = itemNodes[i].SelectSingleNode("link").InnerText;
}
if (itemNodes[i].SelectSingleNode("pubDate") != null)
{
var time = itemNodes[i].SelectSingleNode("pubDate").InnerText;
feedItem.time = getHour(time);
}
if (itemNodes[i].SelectSingleNode("description") != null)
{
feedItem.desc = itemNodes[i].SelectSingleNode("description").InnerText;
}
if (itemNodes[i].SelectSingleNode("content:encoded", nsmgr) != null)
{
feedItem.content = itemNodes[i].SelectSingleNode("content:encoded", nsmgr).InnerText;
}
else
{
feedItem.content = feedItem.desc;
}
feedItem.imageURL = getImage(feedItem.content);
var sourcename = url.Split(new[] { "//" }, StringSplitOptions.None)[1];
feedItem.newsSource = sourcename.Split(new[] { "/" }, StringSplitOptions.None)[0];
if (feedItem.content.Contains("<p>"))
{
var shortContent = feedItem.content.Split(new[] { "<p>" }, StringSplitOptions.None)[1];
string finalShortContent = "";
for (int ii = 0; ii < shortContent.Length; ii++)
{
if (ii > 200 && shortContent[ii].Equals(' '))
break;
while (shortContent[ii].Equals('<') || shortContent[ii].Equals('p') || shortContent[ii].Equals('/') || shortContent[ii].Equals('>'))
ii++;
try
{
finalShortContent += shortContent[ii];
}
catch (Exception e)
{
break;
}
}
finalShortContent += "...";
feedItem.shortcontent = finalShortContent;
}
return feedItem;
}
catch (Exception e)
{
return null;
}
}
string getImage(string full)
{
try
{
var code = full.Split(new[] { "src=\"" }, StringSplitOptions.None)[1];
var fin = code.Split(new[] { "\"" }, StringSplitOptions.None)[0];
return fin;
}
catch(Exception e)
{
return null;
}
}
List<int> getHour(string full)
{
try
{
List<int> smh = new List<int>();
var ph = full.Split(new[] { "2020 " }, StringSplitOptions.None)[1];
var hour = ph.Split(new[] { ":" }, StringSplitOptions.None);
smh.Add(Int32.Parse(hour[0]));
smh.Add(Int32.Parse(hour[1]));
var second = hour[2].Split(new[] { " " }, StringSplitOptions.None)[0];
smh.Add(Int32.Parse(second));
return smh;
}catch(Exception)
{
return null;
}
}
}
推荐答案
尝试一下.应该将函数放在另一个线程中
Try this. It should put the function in another thread
await Task.Run(async () =>
{
//function
});
这篇关于跳过675帧!该应用程序可能在其主线程上做过多的工作.如何在不冻结UI的情况下使应用程序在后台运行?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文