我有一个简单的类,用来下载网页的HTML内容。我在另一个类中处理它,基本上只是将页面解析为我的模型。稍后我想在我的UI上显示它。问题是,我的程序没有响应,当我处理信息时会阻塞UI。
两天前我开始学习这个,我已经阅读了很多在线资料,包括MSDN和一些博客,但我仍然无法弄清楚它。也许有人也能提供帮助。
HtmlDownloadCode:
public async Task<string> GetMangaDescriptionPage(string detailUrl)
{
WebClient client = new WebClient();
Stream data = await client.OpenReadTaskAsync(detailUrl);
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
data.Dispose();
reader.Dispose();
data.Close();
reader.Close();
return s;
}
我的解析类代码:
public async Task<MangaDetailsModel> ParseMangaDescriptionPage()
{
ParseOneManga pom = new ParseOneManga();
string t1 = await pom.GetMangaDescriptionPage(selectedManga.url);
HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(t1);
var divs = htmlDoc.DocumentNode.Descendants("div").Where(x => x.Attributes.Contains("id") &&
x.Attributes["id"].Value.Contains("title")).ToArray();
mangaDetails.mangaName = divs[0].Element("h1").InnerText;
mangaDetails.description = divs[0].Descendants("p").Single().InnerText ?? "DSA";
var tds = divs[0].Descendants("td");
int info = 0;
var chapters = htmlDoc.DocumentNode.Descendants("div").Where(x => x.Attributes.Contains("id") &&
x.Attributes["id"].Value.Contains("chapters")).ToArray();
var chapterUi = chapters[0].Descendants("ul").Where(x => x.Attributes.Contains("class") &&
x.Attributes["class"].Value.Contains("chlist"));
foreach (var li in chapterUi)
{
var liChapter = li.Descendants("li");
foreach (var h3tag in liChapter)
{
var chapterH3 = h3tag.Descendants("a").ToArray();
SingleManagFox chapterData = new SingleManagFox();
chapterData.name = chapterH3[1].InnerHtml;
chapterData.url = chapterH3[1].GetAttributeValue("href", "0");
mangaDetails.chapters.Add(chapterData);
}
};
return mangaDetails;
}
UI代码:
private async void mainBtn_Click(object sender, RoutedEventArgs e)
{
if (mangaList.SelectedItem != null)
{
test12((SingleManagFox)mangaList.SelectedItem);
}
}
private async void test12(SingleManagFox selectedManga)
{
selectedManga = (SingleManagFox)mangaList.SelectedItem;
MangaDetails mangaDetails = new MangaDetails(selectedManga);
MangaDetailsModel mdm = await mangaDetails.ParseMangaDescriptionPage();
txtMangaArtist.Text = mdm.artisName;
txtMangaAuthor.Text = mdm.authorName;
chapterList.ItemsSource = mdm.chapters;
}
对不起,如果这个问题太简单了,但我自己无法解决。
string s = reader.ReadToEnd();
->string s = await reader.ReadToEndAsync();
- user4003407async void
。test12
应该更新为返回Task
并在事件处理程序mainBtn_Click
中等待。当进行异步操作时,您需要尽可能地全程异步。避免阻塞调用。 - Nkosi