private async Task ExecuteCategoryCommand()
{
if (IsCategoryBusy)
{
return;
}
IsCategoryBusy = true;
try
{
CategoryPosts.Clear();
await getCategory();
}
catch (Exception ex)
{
Debug.WriteLine(ex);
MessagingCenter.Send(new MessagingCenterAlert
{
Title = "Error",
Message = "Unable to load items.",
Cancel = "OK"
}, "message");
}
finally
{
IsCategoryBusy = false;
}
}
public async Task getCategoryData()
{
if (CategoryPosts.Count != 0)
{
return;
}
string htmlPage = "";
try
{
using (var client = new HttpClient())
{
htmlPage = await client.GetStringAsync("http://id.wikihow.com/Istimewa:Categorylisting").ConfigureAwait(false);
}
htmlDocument.LoadHtml(htmlPage);
var innerText = htmlDocument.DocumentNode
.Descendants("div")
.Where(o => o.GetAttributeValue("class", "") == "section_text").FirstOrDefault();
htmlDocument.LoadHtml(innerText.OuterHtml);
var divs = htmlDocument.DocumentNode
.Descendants("div")
.Where(o => o.GetAttributeValue("class", "") == "thumbnail").ToList();
foreach (var div in divs)
{
Post newPosts = new Post();
string imageUrl = "";
string title = "";
string url = "";
imageUrl = Regex.Match(div.OuterHtml, "<img.+?src=[\"'](.+?)[\"'].*?>", RegexOptions.IgnoreCase).Groups[1].Value;
url = Regex.Match(div.OuterHtml, "<a.+?href=[\"'](.+?)[\"'].*?>", RegexOptions.IgnoreCase).Groups[1].Value;
var match = Regex.Match(div.OuterHtml, @"(<p.*?>.*?</p>)", RegexOptions.Singleline);
title = Regex.Replace(match.Groups[1].Value, @"\s*<.*?>\s*", "");
title = WebUtility.HtmlDecode(title);
newPosts.Title = title;
newPosts.ImageUrl = imageUrl;
newPosts.PostUrl = "http://id.wikihow.com" + url;
CategoryPosts.Add(newPosts);
}
var sorted = from item in CategoryPosts
orderby item.Title
group item by item.Title[0].ToString() into itemGroup
select new Grouping <string, Post>(itemGroup.Key, itemGroup);
var itemsGrouped = new ObservableRangeCollection <Grouping <string, Post> >(sorted);
ItemsGrouped.ReplaceRange(itemsGrouped);
}
catch (Exception)
{
}
}