public void RunNewExamples()
{
IEnumerable <WebPage> webPages = DemoCollections.GetWebPages();
List <PageComponent> allPageComponents = webPages.SelectMany(wps => wps.PageComponents).ToList();
//allPageComponents.ForEach(pc => Console.WriteLine(pc.ToString()));
List <char> chars = webPages.SelectMany(wps => wps.Name).ToList();
//chars.ForEach(c => Console.Write(c));
var uniqueExtensions = webPages.SelectMany(wps => wps.PageComponents
.Select(pc => new { Extension = pc.Extension })).Distinct().OrderBy(n => n.Extension).ToList();
//uniqueExtensions.ForEach(p => Console.WriteLine(p.Extension));
var allPageComponentsWithIndex = webPages.SelectMany
((wps, index) => wps.PageComponents.Select(c => new { ComponentName = c.Name, PositionOfContainer = index })).ToList();
//allPageComponentsWithIndex.ForEach(pc => Console.WriteLine(string.Concat(pc.PositionOfContainer, ": ", pc.ComponentName)));
var pagesWithComponents = webPages
.SelectMany(wps => wps.PageComponents,
(wp, cp) => new { PageName = wp.Name, ComponentName = cp.Name }).ToList();
//pagesWithComponents.ForEach(p => Console.WriteLine(string.Concat(p.PageName, ": ", p.ComponentName)));
var pagesWithComponentsAndIndex = webPages.SelectMany((wps, index) => wps.PageComponents
.Select(c => new { ComponentName = c.Name, PositionOfContainer = index }),
(wp, cp) => new { PageName = wp.Name, ComponentName = cp.ComponentName, PositionOfContainer = cp.PositionOfContainer }).ToList();
pagesWithComponentsAndIndex.ForEach(c => Console.WriteLine(string.Concat("Page: ", c.PageName, ", position: ", c.PositionOfContainer, ", component: ", c.ComponentName)));
}
public void RunDemo()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
Singer singer = singers.FirstOrDefault(s => s.Id == 100);
Console.WriteLine(singer == null ? "No such singer" : singer.LastName);
}
private void RunFirstPrototype()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
IEnumerable <IGrouping <int, Concert> > concertGroups = concerts.GroupBy(c => c.SingerId);
foreach (IGrouping <int, Concert> concertGroup in concertGroups)
{
Console.WriteLine("Concerts for singer of ID {0}:", concertGroup.Key);
foreach (Concert concert in concertGroup)
{
Console.WriteLine("Number of concerts: {0}, in the year of {1}.", concert.ConcertCount, concert.Year);
}
}
IEnumerable <IGrouping <int, int> > concertGroupsFiltered = concerts.GroupBy(c => c.SingerId, c => c.ConcertCount);
foreach (IGrouping <int, int> concertGroup in concertGroupsFiltered)
{
Console.WriteLine("Concerts for singer of ID {0}:", concertGroup.Key);
foreach (int concertCount in concertGroup)
{
Console.WriteLine("Number of concerts: {0}.", concertCount);
}
}
}
private void RunSecondPrototype()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
SingerGenderComparer comparer = new SingerGenderComparer();
IEnumerable <IGrouping <int, Concert> > concertGroups = concerts.GroupBy(c => c.SingerId, comparer);
foreach (IGrouping <int, Concert> concertGroup in concertGroups)
{
Console.WriteLine("Concerts of {0} singers: ", comparer.IsPerformedByFemaleSinger(concertGroup.Key) ? "female" : "male");
foreach (Concert concert in concertGroup)
{
Console.WriteLine("Number of concerts: {0}, in the year of {1} by singer {2}.", concert.ConcertCount, concert.Year, concert.SingerId);
}
}
IEnumerable <IGrouping <int, int> > concertGroupsFiltered = concerts.GroupBy(c => c.SingerId, c => c.ConcertCount, comparer);
foreach (IGrouping <int, int> concertGroup in concertGroupsFiltered)
{
Console.WriteLine("Concerts of {0} singers: ", comparer.IsPerformedByFemaleSinger(concertGroup.Key) ? "female" : "male");
foreach (int concertCount in concertGroup)
{
Console.WriteLine("Number of concerts: {0}.", concertCount);
}
}
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
bool all = bands.All(b => b.Length > 2);
Console.WriteLine(all);
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> orderedOne = bands.OrderBy(band => band.Length);
foreach (string item in orderedOne)
{
//Console.WriteLine(item);
}
IEnumerable <string> orderedTwo = bands.OrderBy(band => band, new ConsonantNumberComparer());
foreach (string item in orderedTwo)
{
//Console.WriteLine(item);
}
IEnumerable <string> orderedThree = bands.OrderBy(band => band, new ConsonantNumberComparer()).ThenBy(band => band);
foreach (string item in orderedThree)
{
//Console.WriteLine(item);
}
IEnumerable <string> ordered = bands.OrderByDescending(band => band, new ConsonantNumberComparer()).ThenByDescending(band => band);
foreach (string item in ordered)
{
Console.WriteLine(item);
}
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
bool exists = bands.Any();
//bool exists = bands.Any(b => b.EndsWith("hkhkj"));
Console.WriteLine(exists);
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> bandsReversed = bands.Reverse();
foreach (string item in bandsReversed)
{
Console.WriteLine(item);
}
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> res = bands.Skip(10);
foreach (string item in res)
{
Console.WriteLine(item);
}
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> selectedItems = bands.Take(5).Concat(bands.Reverse().Take(5));
foreach (string item in selectedItems)
{
Console.WriteLine(item);
}
}
public void RunDemo()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
Dictionary <int, Singer> singersDictionary = singers.ToDictionary(s => s.Id);
Console.WriteLine(singersDictionary[2].FirstName);
Dictionary <int, string> singersDictionaryNames =
singers.ToDictionary(s => s.Id, si => string.Format("Last name: {0}", si.LastName));
Console.WriteLine(singersDictionaryNames[2]);
}
public void RunSelectManyOperatorExample()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <char> characters = bands.SelectMany(b => b.ToArray());
foreach (char item in characters)
{
Console.WriteLine(item);
}
}
public void RunDemo()
{
IEnumerable <int> integers = Enumerable.Range(1, 100);
int sum = integers.Sum();
Console.WriteLine(sum);
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
int allConcerts = concerts.Sum(c => c.ConcertCount);
Console.WriteLine(allConcerts);
}
public void RunSelectManyOperatorExampleComplex()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
var singerConcerts = singers.SelectMany(s => concerts.Where(c => c.SingerId == s.Id)
.Select(c => new { Year = c.Year, ConcertCount = c.ConcertCount, Name = string.Concat(s.FirstName, " ", s.LastName) }));
foreach (var item in singerConcerts)
{
Console.WriteLine(string.Concat(item.Name, ", ", item.Year, ", ", item.ConcertCount));
}
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
string[] bandsTwo = DemoCollections.GetBands();
bool equal = bands.SequenceEqual(bandsTwo);
Console.WriteLine(equal);
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Singer> singersTwo = DemoCollections.GetSingers();
bool singersEqual = singers.SequenceEqual(singersTwo, new DefaultSingerComparer());
Console.WriteLine(singersEqual);
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> res = bands.TakeWhile(b => b[0] != 'E');
foreach (string s in res)
{
//Console.WriteLine(s);
}
IEnumerable <string> res2 = bands.TakeWhile((b, i) => b[0] != 'E' && i < 8);
foreach (string s in res2)
{
Console.WriteLine(s);
}
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> res = bands.SkipWhile(s => s.Length < 10);
foreach (string item in res)
{
//Console.WriteLine(item);
}
IEnumerable <string> res2 = bands.SkipWhile((s, i) => s.Length < 10 && i < 10);
foreach (string item in res2)
{
Console.WriteLine(item);
}
}
public void RunTakeDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <String> topItems = bands.Take(10);
foreach (string item in topItems)
{
//Console.WriteLine(item);
}
var anonymous = bands.Take(10).Select(b => new { Name = b, Length = b.Length });
foreach (var anon in anonymous)
{
Console.WriteLine("Band name: {0}, length: {1}", anon.Name, anon.Length);
}
}
public void RunDemo()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Concert> concerts = DemoCollections.GetConcerts();
var singerConcerts = singers.Join(concerts, s => s.Id, c => c.SingerId, (s, c) => new
{
Id = s.Id,
SingerName = string.Concat(s.FirstName, " ", s.LastName),
ConcertCount = c.ConcertCount,
Year = c.Year
});
foreach (var res in singerConcerts)
{
Console.WriteLine(string.Concat(res.Id, ": ", res.SingerName, ", ", res.Year, ", ", res.ConcertCount));
}
}
public void RunDemo()
{
List <int> integers = new List <int>()
{
54, 23, 76, 123, 93, 7, 3489
};
int intMin = integers.Min();
string[] bands = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis", "Abba", "Blur"
, "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil", "Kent", "Madness", "Manic Street Preachers"
, "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears"
, "Deep Purple", "KISS" };
string stringMin = bands.Min();
IEnumerable <Singer> singers = DemoCollections.GetSingers();
int minSingerBirthYear = singers.Min(s => s.BirthYear);
String minSingerName = singers.Min(s => s.FirstName);
}
public void RunDemo()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
ILookup <int, Singer> singersByBirthYear = singers.ToLookup(s => s.BirthYear);
IEnumerable <Singer> filtered = singersByBirthYear[1964];
foreach (Singer s in filtered)
{
Console.WriteLine(s.LastName);
}
ILookup <int, string> singerNamesByBirthYear = singers.ToLookup(s => s.BirthYear, si => string.Concat(si.LastName, ", ", si.FirstName));
IEnumerable <string> filtered2 = singerNamesByBirthYear[1964];
foreach (string s in filtered2)
{
Console.WriteLine(s);
}
}
public void RunDemo()
{
string[] bands = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis"
, "Abba", "Blur", "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil","Kent", "Madness", "Manic Street Preachers"
, "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears"
, "Deep Purple", "KISS" };
bool contains = bands.Contains("Queen");
Console.WriteLine(contains);
IEnumerable <Singer> singers = DemoCollections.GetSingers();
Singer s = new Singer()
{
Id = 2, FirstName = "Elvis", LastName = "Presley", BirthYear = 1954
};
bool containsSinger = singers.Contains(s, new DefaultSingerComparer());
Console.WriteLine(containsSinger);
}
public void RunDemo()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <string> bandsDuplicated = bands.Concat(bands);
IEnumerable <string> uniqueBands = bandsDuplicated.Distinct();
foreach (String unique in uniqueBands)
{
Console.WriteLine(unique);
}
IEnumerable <Singer> singers = DemoCollections.GetSingers();
IEnumerable <Singer> singersDuplicates = singers.Concat(singers);
IEnumerable <Singer> uniqueSingers = singersDuplicates.Distinct(new DefaultSingerComparer());
foreach (Singer singer in uniqueSingers)
{
Console.WriteLine(singer.Id);
}
}
public void RunSelectOperatorExample()
{
string[] bands = DemoCollections.GetBands();
IEnumerable <int> lengths = bands.Select(b => b.Length);
foreach (int l in lengths)
{
Console.WriteLine(l);
}
var customObjects = bands.Select(b => new { Name = b, Length = b.Length });
foreach (var item in customObjects)
{
Console.WriteLine("Band name: {0}, length: {1}", item.Name, item.Length);
}
IEnumerable <Band> bandListSimple = bands.Select(b => new Band()
{
AllCapitals = b.ToUpper(), Name = b, NameLength = b.Length
});
foreach (Band band in bandListSimple)
{
Console.WriteLine(string.Concat(band.Name, ", ", band.NameLength, ", ", band.AllCapitals));
}
IEnumerable <Band> bandList = bands.Select((b, i) => new Band()
{
AllCapitals = b.ToUpper(), BandIndex = i + 1, Name = b, NameLength = b.Length
});
foreach (Band band in bandList)
{
Console.WriteLine(string.Concat(band.BandIndex, ": ", band.Name, ", ", band.NameLength, ", ", band.AllCapitals));
}
}
public void RunDemo()
{
/*
* IEnumerable<Singer> singers = DemoCollections.GetSingers();
* IEnumerable<Concert> concerts = DemoCollections.GetConcerts();
*
* var singerConcerts = singers.GroupJoin(concerts, s => s.Id, c => c.SingerId, (s, co) => new
* {
* Id = s.Id
* , SingerName = string.Concat(s.FirstName, " ", s.LastName)
* , ConcertCount = co.Sum(c => c.ConcertCount)
* });
*
* foreach (var res in singerConcerts)
* {
* Console.WriteLine(string.Concat(res.Id, ": ", res.SingerName, ", ", res.ConcertCount));
* }
*/
//1st silly try
IEnumerable <Student> students = DemoCollections.GetStudents();
IEnumerable <StudentScore> studentScores = DemoCollections.GetScores();
IEnumerable <IGrouping <string, StudentScore> > subjectGroupings = studentScores
.GroupBy(score => score.Subject);
foreach (var subjectGroup in subjectGroupings)
{
Console.WriteLine($"Subject: {subjectGroup.Key}");
Console.WriteLine($"Total points across all students: {subjectGroup.Sum(g => g.Points)}");
}
var totalStudentScores = students.GroupJoin(studentScores
, student => student.Id, score => score.StudentId, (student, scores) =>
new
{
Id = student.Id,
StudentName = student.Name,
TotalScore = scores.Sum(s => s.Points)
}
);
foreach (var student in totalStudentScores)
{
Console.WriteLine($"ID: {student.Id}, Name: {student.StudentName}, Total score: {student.TotalScore} ");
}
//grouped try
var groupedStudentScores = students.GroupJoin(studentScores
, student => student.Id, score => score.StudentId, (student, scores) =>
{
var subjectGroups = scores.Where(score => score.StudentId == student.Id)
.GroupBy(score => score.Subject);
Dictionary <string, int> scoresDictionary = new Dictionary <string, int>();
foreach (var subjectGroup in subjectGroups)
{
string subjectName = subjectGroup.Key;
int subjectScoreTotal = subjectGroup.Sum(s => s.Points);
scoresDictionary[subjectName] = subjectScoreTotal;
}
return(new
{
Id = student.Id,
StudentName = student.Name,
Scores = scoresDictionary
});
}
);
foreach (var student in groupedStudentScores)
{
Console.WriteLine($"ID: {student.Id}, Name: {student.StudentName}, Total score by subject: {JsonConvert.SerializeObject(student.Scores)} ");
}
}
private void RunVariousExamples()
{
IEnumerable <PageComponent> pageComponents = DemoCollections.GetPageComponents();
//group by type
IEnumerable <IGrouping <string, PageComponent> > groupByTypeBasic = pageComponents.GroupBy(g => g.Type);
foreach (var group in groupByTypeBasic)
{
/*
* Console.WriteLine($"Element type: {group.Key}, items in group: {group.Count()}, total size: {group.Sum(g => g.SizeBytes)}");
* Console.WriteLine("============================");
* foreach (PageComponent pc in group)
* {
* Console.WriteLine($"Element name: {pc.Name}");
* }
* Console.WriteLine("============================");
* Console.WriteLine();
*/
}
//group by extension
IEnumerable <IGrouping <string, PageComponent> > groupByExtensionBasic = pageComponents.GroupBy(g => g.Extension);
foreach (var group in groupByExtensionBasic)
{
/*
* Console.WriteLine($"Extension: {group.Key}");
* Console.WriteLine("============================");
* foreach (PageComponent pc in group)
* {
* Console.WriteLine($"Element name: {pc.Name}");
* }
* Console.WriteLine("============================");
* Console.WriteLine();
*/
}
var groupByComponentSizeRange = pageComponents.GroupBy(pe =>
{
int groupSize = 10000;
int lowerBound = pe.SizeBytes - pe.SizeBytes % groupSize;
int upperBound = lowerBound + groupSize;
return(new PageComponentSizeGrouper()
{
LowerBound = lowerBound, UpperBound = upperBound
});
}, new PageComponentSizeGrouperEqualityComparer());
foreach (var group in groupByComponentSizeRange.OrderBy(g => g.Key.LowerBound))
{
/*
* Console.WriteLine($"Size range: {group.Key.ToString()}, items in group: {group.Count()}");
* Console.WriteLine("============================");
* foreach (PageComponent pc in group)
* {
* Console.WriteLine($"Element name: {pc.Name}");
* }
* Console.WriteLine("============================");
* Console.WriteLine();
*/
}
var duplicatesFinder = pageComponents.GroupBy(pe => pe, new PageElementEqualityComparer());
foreach (var group in duplicatesFinder)
{
//Console.WriteLine($"Element name: {group.Key.Name}, occurrence: {group.Count()}");
}
var groupByTypeWithElementSelector = pageComponents.GroupBy(
pe => pe.Type,
pe =>
new { NameCapitals = pe.Name.ToUpper(), ShortName = pe.Name.Substring(0, 5), CharCount = pe.Name.Count() });
foreach (var group in groupByTypeWithElementSelector)
{
/*
* Console.WriteLine($"Element type: {group.Key}");
* Console.WriteLine("============================");
* foreach (var pc in group)
* {
* Console.WriteLine($"Element name capitals: {pc.NameCapitals}, short name: {pc.ShortName}, chars: {pc.CharCount}");
* }
* Console.WriteLine("============================");
* Console.WriteLine();
*/
}
var groupByComponentSizeWithResultSelector = pageComponents.GroupBy(pe =>
{
int groupSize = 10000;
int lowerBound = pe.SizeBytes - pe.SizeBytes % groupSize;
int upperBound = lowerBound + groupSize;
return(new PageComponentSizeGrouper()
{
LowerBound = lowerBound, UpperBound = upperBound
});
},
(sizeGroup, pageElements) =>
new
{
ElementCountInGroup = pageElements.Count(),
MinElementSize = pageElements.Min(pe => pe.SizeBytes),
MaxElementSize = pageElements.Max(pe => pe.SizeBytes),
GroupingKeyOrderer = sizeGroup.LowerBound,
GroupingKeyToString = sizeGroup.ToString()
}
, new PageComponentSizeGrouperEqualityComparer());
foreach (var group in groupByComponentSizeWithResultSelector.OrderBy(g => g.GroupingKeyOrderer))
{
/*
* Console.WriteLine($"Size range: {group.GroupingKeyToString}");
* Console.WriteLine($"Item count in group: { group.ElementCountInGroup}");
* Console.WriteLine($"Min element size: {group.MinElementSize}");
* Console.WriteLine($"Max element size: {group.MaxElementSize}");
* Console.WriteLine("============================");
* Console.WriteLine();
*/
}
var groupByComponentSizeWithResultAndElementSelector = pageComponents.GroupBy(pe =>
{
int groupSize = 10000;
int lowerBound = pe.SizeBytes - pe.SizeBytes % groupSize;
int upperBound = lowerBound + groupSize;
return(new PageComponentSizeGrouper()
{
LowerBound = lowerBound, UpperBound = upperBound
});
}, pe =>
new
{
ElementName = pe.Name,
ModifiedSize = pe.SizeBytes - 1000
},
(sizeGroup, pageElements) =>
{
int minElementSize = pageElements.Min(pe => pe.ModifiedSize);
int maxElementSize = pageElements.Max(pe => pe.ModifiedSize);
string minElementName = (from pe in pageElements where pe.ModifiedSize == minElementSize select pe.ElementName).FirstOrDefault();
string maxElementName = (from pe in pageElements where pe.ModifiedSize == maxElementSize select pe.ElementName).FirstOrDefault();
return(new
{
ElementCountInGroup = pageElements.Count(),
MinElementSize = minElementSize,
MaxElementSize = maxElementSize,
MinElementName = minElementName,
MaxElementName = maxElementName,
GroupingKeyOrderer = sizeGroup.LowerBound,
GroupingKeyToString = sizeGroup.ToString()
});
}
, new PageComponentSizeGrouperEqualityComparer());
foreach (var group in groupByComponentSizeWithResultAndElementSelector.OrderBy(g => g.GroupingKeyOrderer))
{
Console.WriteLine($"Size range: {group.GroupingKeyToString}");
Console.WriteLine($"Item count in group: { group.ElementCountInGroup}");
Console.WriteLine($"Min element size: {group.MinElementSize}");
Console.WriteLine($"Max element size: {group.MaxElementSize}");
Console.WriteLine($"Min element name: {group.MinElementName}");
Console.WriteLine($"Max element name: {group.MaxElementName}");
Console.WriteLine("============================");
Console.WriteLine();
}
}
