public async Task <double> StartScraping(AvailableCurrencies from, AvailableCurrencies to, int amount = 1)
{
string Url = SimpleUrl.Insert(SimpleUrl.IndexOf("guru") + "guru".Length + 1, from.ToString());
Url = Url.Insert(Url.IndexOf(from.ToString()) + from.ToString().Length + 1, to.ToString());
Url = Url.Insert(Url.IndexOf(to.ToString()) + to.ToString().Length + 1, amount.ToString());
HttpClient client = new HttpClient();
string strHtml;
try
{
strHtml = await client.GetStringAsync(Url);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(-1);
}
HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc?.LoadHtml(strHtml);
HtmlNode valueNode = htmlDoc.DocumentNode.Descendants("input")
.Where(node => node.GetAttributeValue("data-role", "")
.Equals("secondary-input")).FirstOrDefault();
string exchange_rate = valueNode.GetAttributeValue("value", "");
double rate = -1;
try
{
if (!double.TryParse(exchange_rate, out rate))
{
double.TryParse(exchange_rate.Replace('.', ','), out rate);
}
}
catch (Exception)
{
return(rate);
}
return(rate);
}
public IDictionary <Currency, decimal> RatesOf(Currency target) => AvailableCurrencies.ToDictionary(curr => curr, curr => RateOf(curr, target));
private async Task <List <Item> > StartSearch(RequestModel model)
{
List <string> sites = model.CheckedSites;
string itemName = model.ItemName;
int itemCount = model.ItemCount;
int minPrice = model.MinPrice == null ? 0 : (int)model.MinPrice;
int maxPrice = model.MaxPrice == null ? 0 : (int)model.MaxPrice;
List <Item> AllItems = new List <Item>();
//AutoResetEvent auto = new AutoResetEvent(false);
List <Task> Tasks = new List <Task>();
foreach (string s in sites)
{
Task task = Task.Run(async() =>
{
Assembly asm = null;
try
{
string asmPath = HttpRuntime.AppDomainAppPath + $"Plugins/{s}Library.dll";
asm = Assembly.LoadFrom(asmPath);
}
catch (FileNotFoundException e)
{
Console.WriteLine(e.Message);
return;
//auto.Set();
}
catch (ArgumentException e)
{
Console.WriteLine(e.Message);
return;
//auto.Set();
}
var pluginTypes = from t in asm.GetTypes()
where t.IsClass && (t.BaseType == typeof(BaseScraper))
select t;
foreach (Type t in pluginTypes)
{
BaseScraper obj = (BaseScraper)Activator.CreateInstance(t);
int min = 0, max = 0;
if (minPrice != 0 || maxPrice != 0)
{
AvailableCurrencies currencyFrom = (AvailableCurrencies)model.Currency;
CurrencyAttribute curr_attr = t.GetCustomAttribute(typeof(CurrencyAttribute)) as CurrencyAttribute;
AvailableCurrencies currencyTo = curr_attr.Currency;
CurrencyScraper cs = new CurrencyScraper();
if (currencyFrom != currencyTo)
{
double rate = await cs.StartScraping(currencyFrom, currencyTo);
min = Convert.ToInt32(rate * minPrice);
max = Convert.ToInt32(rate * maxPrice);
}
else
{
min = minPrice;
max = maxPrice;
}
}
List <Item> items = await obj?.StartScraping(itemName, itemCount, min, max);
AllItems.AddRange(items);
//auto.Set();
}
});
Tasks.Add(task);
}
//foreach (Task t in Tasks)
// auto.WaitOne();
await Task.WhenAll(Tasks);
return(AllItems);
}
public CurrencyAttribute(AvailableCurrencies currency) => this.Currency = currency;
private void SearchBar_TextChanged(object sender, TextChangedEventArgs e)
{
filteredCurrencies = AvailableCurrencies.Where(x => x.Name.ToLower().Contains(e.NewTextValue.ToLower()) || x.Code.ToLower().Contains(e.NewTextValue.ToLower())).ToList();
currencyList.ItemsSource = FilteredCurrencies;
}
