public byte[] GetNewsPhoto(int NewsID)
{
var ctx = new NewsDBDataContext();
var photo = (from similer in ctx.News
where similer.ID == NewsID
select similer.photo
).Single();
return(photo.ToArray());
}
public List <New> GetSimilarNews(string Userinput)
{
var ctx = new NewsDBDataContext();
var news = (from similer in ctx.News
where similer.Category == Userinput
select similer
).ToList();
return(news);
}
public List <New> GetNBestPossitive(string Userinput)
{
var ctx = new NewsDBDataContext();
int n = int.Parse(Userinput);
var BestNP = (from best in ctx.News
where best.Classification == "Postive"
orderby best.Probability descending
select best).Take(n).ToList();
return(BestNP);
}
public List <New> GetTenNews(string Userinput)
{
string[] words = new string[] { };
words = Userinput.Split(' ');
var ctx = new NewsDBDataContext();
var result = (from part in ctx.News
orderby part.Date descending
select part).ToList();
foreach (var term in words)
{
result = (from part in result
where part.Title.Contains(term) || part.Text.Contains(term)
select part).Take(10).ToList();
}
return(result);
}
public void AddToRanking(Ranking UserRanking)
{
var ctx = new NewsDBDataContext();
var newRank = (from oldR in ctx.Rankings
where oldR.UserID == UserRanking.UserID && oldR.NewsID == UserRanking.NewsID
select oldR
).SingleOrDefault();
if (newRank == null)
{
//Add the new Ranking and save it.
ctx.Rankings.InsertOnSubmit(UserRanking);
ctx.SubmitChanges();
}
else
{
newRank.Rank = UserRanking.Rank;
ctx.SubmitChanges();
}
int NewsId = UserRanking.NewsID;
//Calculate the number of like for the NewsID
int sumofNews = (int)(from s in ctx.Rankings
where NewsId == s.NewsID
select s.Rank).Sum();
//Count number of all Ranking for NewsID
int countofNews = (from s in ctx.Rankings
where NewsId == s.NewsID
select s
).Count();
//calculate the Probability for NewsID
float NewPro = ( float )sumofNews / countofNews;
NewPro = (float)System.Math.Round(NewPro, 2);
//Search for NewsID in News table
var news = (from n in ctx.News
where n.ID == NewsId
select n
).SingleOrDefault();
if (NewPro >= 0.5)
{
news.Classification = "Postive";
news.Probability = NewPro;
ctx.SubmitChanges();
}
else
{
news.Classification = "Negative";
news.Probability = NewPro;
ctx.SubmitChanges();
}
}
