private static Func <Book, bool> getBookEquality(Book book)
{
return(b => b.Title == book.Title && b.Author.Name == book.Author.Name);
}
static void Main(string[] args)
{
var data = loadUserTakeupCSV();
// Simple Where
var result = data.Where(ut => ut.EmailAddress == "*****@*****.**").ToList();
Console.WriteLine($"{result[0].FirstName} {result[0].LastName}");
// SingleOrDefault
var result2 = data.SingleOrDefault(ut => ut.EmailAddress == "*****@*****.**");
if (result2 != null)
{
Console.WriteLine($"{result2.FirstName} {result2.LastName}");
}
var result3 = data.Where(ut => ut.EmailAddress == "*****@*****.**");
if (!result3.Any())
{
Console.WriteLine("No matches for result3");
}
var result4 = data.FirstOrDefault(ut => ut.AccountType != "DSPT");
Console.WriteLine($"{result4?.FirstName} {result4?.LastName} {result4?.AccountType}");
// UserTake up, most recent first
Console.WriteLine("===========================================");
var result5 = data.OrderByDescending(o => o.FirstRegistered).ToList();
for (int i = 0; i < 5; i++)
{
var ut = result5[i];
Console.WriteLine($"{ut.FirstName} {ut.LastName} {ut.FirstRegistered}");
}
Console.WriteLine("===========================================");
// SQL SELECT TOP 5
foreach (var ut in result5.Take(5))
{
Console.WriteLine($"{ut.FirstName} {ut.LastName} {ut.FirstRegistered}");
}
Console.WriteLine("===========================================");
// SQL OrderBy LastName, FirstName
var result6 = data
.Where(ut => ut.AccountType == "NHSmail")
.OrderBy(o => o.LastName)
.ThenBy(o => o.FirstName)
.Take(5);
foreach (var ut in result6)
{
Console.WriteLine($"{ut.FirstName} {ut.LastName} {ut.FirstRegistered}");
}
Console.WriteLine("===========================================");
// SQL SELECT AccountType, COUNT(*) FROM UserTakeup GROUP BY AccountType
var result7 = data.GroupBy(g => g.AccountType);
foreach (var grp in result7)
{
Console.WriteLine($"Account type {grp.Key} has {grp.Count()} registered users");
}
foreach (var grp in result7)
{
var mra = grp.OrderByDescending(o => o.LastAccessed).First();
Console.WriteLine($"Account type {grp.Key} most recent access is by {mra.FirstName} {mra.LastName} at {mra.LastAccessed}");
}
var accTypes = data.Select(a => a.AccountType).Distinct().ToList();
foreach (var accType in accTypes)
{
var recs = data.Where(a => a.AccountType == accType);
var mra = recs.OrderByDescending(o => o.LastAccessed).First();
Console.WriteLine($"Account type {accType} most recent access is by {mra.FirstName} {mra.LastName} at {mra.LastAccessed}");
}
var mostpopular = result7.OrderBy(o => o.Count()).First();
Console.WriteLine($"Least popular account type is {mostpopular.Key} with {mostpopular.Count()} users");
var words = new List <string>()
{
"Apple",
"Banana",
"Cherry",
"Apple"
};
var foundWords = new List <string>();
bool hasDuplicates = false;
foreach (var word in words)
{
if (foundWords.Contains(word))
{
hasDuplicates = true;
break;
}
foundWords.Add(word);
}
Console.WriteLine($"Has duplicates long way = {hasDuplicates}");
hasDuplicates = words.GroupBy(g => g).Any(g => g.Count() > 1);
Console.WriteLine($"Has duplicates linq way = {hasDuplicates}");
var fruits = new List <Fruit>()
{
new Fruit()
{
Name = "Apple", Variety = "Granny Smith"
},
new Fruit()
{
Name = "Banana", Variety = "Ffyes"
},
new Fruit()
{
Name = "Cherry", Variety = "Royal"
},
new Fruit()
{
Name = "Apple", Variety = "Gala"
}
};
var fruitGrps = fruits.GroupBy(g => g.Name);
var apples = fruitGrps
.Where(g => g.Key == "Apple")
.SelectMany(s => s
.Select(v => v.Variety)
);
foreach (var variety in apples)
{
Console.WriteLine($"Apples: {variety}");
}
// Respository stuff
var reposdata = DataLoader.LoadData("DSPTUserTakeup.csv");
var respository = new Repository(reposdata);
return;
var books = loadBooksJson();
// .Where - Only returns items matching the input condition/predicate
//var booksStartingWithA = books.Where(b => b.Title.StartsWith("A"));
//writeOutBooks(booksStartingWithA);
//var booksByEllieSmith = books.Where(b => b.Author.Name == "Ellie Smith");
//writeOutBooks(booksByEllieSmith);
//var bookStartingWithA = books.Single(b => b.Title.StartsWith("A"));
//writeOutBook(bookStartingWithA);
//var bookByChrisClark = books.FirstOrDefault(b => b.Author.Name == "Chris Clark");
//writeOutBook(bookByChrisClark);
//var bookByEllieSmith = books.First(b => b.Author.Name == "Ellie Smith");
//writeOutBook(bookByEllieSmith);
//var bookByEllieSmith = books.FirstOrDefault(b => b.Author.Name == "Ellie Smith");
//var hasBook = (bookByEllieSmith != null);
//Console.WriteLine($"Ellie hasBook = {hasBook}");
//var bookByChrisClark = books.FirstOrDefault(b => b.Author.Name == "Chris Clark");
//hasBook = (bookByChrisClark != null);
//Console.WriteLine($"Chris hasBook = {hasBook}");
//var bookStartingWithA = books.FirstOrDefault(b => b.Title.StartsWith("A"));
//hasBook = (bookStartingWithA != null);
//Console.WriteLine($"The letter A hasBook = {hasBook}");
//var hasBook = books.Any(b => b.Author.Name == "Ellie Smith");
//Console.WriteLine($"Ellie hasBook = {hasBook}");
//hasBook = books.Any(b => b.Author.Name == "Chris Clark");
//Console.WriteLine($"Chris hasBook = {hasBook}");
//hasBook = books.Any(b => b.Title.StartsWith("A"));
//Console.WriteLine($"The letter A hasBook = {hasBook}");
Console.WriteLine($"The letter A hasBook = {books.Any(b => b.Title.StartsWith("A"))}");
//var allBooksByEllie = books.All(b => b.Author.Name == "Ellie Smith");
//Console.WriteLine($"All Books by Ellie = {allBooksByEllie}");
//Console.WriteLine($"Have books = {books.Any()}");
//writeOutBook(bookByEllieSmith);
var book1 = new Book()
{
Title = "Childs Play",
Publisher = "Chapterhouse",
Author = new AuthorInfo()
{
Name = "Ellie Smith",
Website = "www.agoodread.com"
},
Categories = new List <string>()
{
"Thriller"
}
};
var book2 = new Book()
{
Title = "Childs Play",
Publisher = "Chapterhouse",
Author = new AuthorInfo()
{
Name = "Ellie Smith",
Website = "www.agoodread.com"
},
Categories = new List <string>()
{
"Thriller"
}
};
var str1 = "This is one";
var str2 = str1;
Console.Write($"str2 = {str2}");
str1 = "This is two";
Console.Write($"str2 = {str2}");
var book3 = book1;
Console.WriteLine($"Book3 title = {book3.Title}");
book1.Title = "Something different";
Console.WriteLine($"Book3 title = {book3.Title}");
Console.WriteLine($"List of Book1 contains Book3 = {new List<Book>() { book1 }.Contains(book3)}");
//var haveElliesBook = books.Contains(book1, new BookComparer());
//Console.WriteLine($"haveElliesBook = {haveElliesBook}");
//haveElliesBook = books.Any(b => b.Title == book1.Title && book1.Author.Name == b.Author.Name);
//Console.WriteLine($"haveElliesBook = {haveElliesBook}");
//haveElliesBook = books.Any(getBookEquality(book1));
//Console.WriteLine($"haveElliesBook = {haveElliesBook}");
Console.WriteLine("Hit a key");
Console.ReadKey();
}