static void Main(string[] args)
{
// Array测试
// 固定大小初始化数组
Console.WriteLine("Create an Array type collection of Animal objects and use it:");
Animal[] animalArray = new Animal[2];
Cow myCow1 = new Cow("Lea");
animalArray[0] = myCow1;
animalArray[1] = new Chicken("Noa");
foreach (Animal myAnimal in animalArray)
{
Console.WriteLine($"New {myAnimal.ToString()} object added to Array collection, Name = {myAnimal.Name}");
}
Console.WriteLine($"Array collection contains {animalArray.Length} objects.");
animalArray[0].Feed();
((Chicken)animalArray[1]).LayEgg(); // 转换Chicken
Console.WriteLine();
// ArrayList测试
// 可扩展大小
Console.WriteLine("Create an ArrayList type collection of Animal objects and use it:");
ArrayList animalArrayList = new ArrayList();
Cow myCow2 = new Cow("Rual");
animalArrayList.Add(myCow2);
animalArrayList.Add(new Chicken("Andrea"));
foreach (Animal myAnimal in animalArrayList)
{
Console.WriteLine($"New {myAnimal.ToString()} object added to ArrayList collection, Name = {myAnimal.Name}");
}
Console.WriteLine($"ArrayList collection contains {animalArrayList.Count} objects.");
((Animal)animalArrayList[0]).Feed(); // 转换Animal
((Chicken)animalArrayList[1]).LayEgg(); // 转换Chicken
Console.WriteLine();
Console.WriteLine("Additional manipulation of ArrayList:");
animalArrayList.RemoveAt(0); // 删除列表中第一项
// animalArrayList.Remove(myCow2); // 删除列表中指定项
((Animal)animalArrayList[0]).Feed(); // 转换为Animal
animalArrayList.AddRange(animalArray); // 增加数组
((Chicken)animalArrayList[2]).LayEgg(); // 转换Chicken
Console.WriteLine($"The animal called {myCow1.Name} is at index {animalArrayList.IndexOf(myCow1)}.");
myCow1.Name = "Mary";
Console.WriteLine($"The animal is now called {((Animal)animalArrayList[1]).Name}");
// 测试Animals类
Console.WriteLine();
Animals animalCollection = new Animals();
animalCollection.Add(new Cow("Donna"));
animalCollection.Add(new Chicken("Kevin"));
foreach (Animal myAnimal in animalCollection)
{
myAnimal.Feed();
}
// 测试Animals2类
Console.WriteLine();
Animals2 animalCollection2 = new Animals2();
animalCollection2.Add("Donna", new Cow("Donna"));
animalCollection2.Add("Kevin", new Chicken("Kevin"));
// 未实现简单迭代器
// foreach (DictionaryEntry myEntry in animalCollection2)
// Console.WriteLine($"New {myEntry.Value.ToString()} object added to custom collection, Name = {((Animal)myEntry.Value).Name}");
foreach (Animal myAnimal in animalCollection2)
{
Console.WriteLine($"New {myAnimal.ToString()} object added to custom collection, Name = {myAnimal.Name}");
}
Console.ReadKey();
}
static void Main(string[] args)
{
/* var strings = new List<string>();
* strings.Add("one");
* strings.Contains("two");*/
var alphabetWords = new Dictionary <char, string>();
alphabetWords.Add('a', "Aztec");
alphabetWords.Add('b', "Babylon");
alphabetWords.Add('c', "Cataclysm");
alphabetWords.Add('d', "Dude");
foreach (var let in alphabetWords)
{
Console.WriteLine($"The current Letter is {let}");
}
var dee = alphabetWords['d'];
alphabetWords['d'] = "dog";
foreach (var alphabetWord in alphabetWords)
{
Console.WriteLine($"The current key is {alphabetWord.Key}, and the value is {alphabetWord.Value}");
}
//DESTRUCTURING
/* foreach (var (keys, value) in alphabetWords)
* {
* Console.WriteLine($"The current key is {alphabetWord.Key}, and the value is {alphabetWord.Value}");
* }*/
var otherDictionary = new Dictionary <int, string>();
otherDictionary.Add(1, "One");
otherDictionary.Add(2, "Two");
otherDictionary.Add(3, "Three");
otherDictionary.Add(4, "Four");
otherDictionary.Add(5, "Five");
otherDictionary.Add(6, "Six");
otherDictionary.Add(7, "Seven");
foreach (var num in otherDictionary)
{
Console.WriteLine($"Current Number is {num}");
}
var seven = otherDictionary[7];
Console.WriteLine($"{seven}");
/* otherDictionary[7].Replace(666);*/
otherDictionary[7] = "Changed";
Console.WriteLine(seven);
var myHashset = new HashSet <Animals>();
var myAnimal = new Animals {
Age = 3, Color = "Black", Name = "Duder", Type = "Dog"
};
var myOtherAnimal = new Animals {
Age = 10, Color = "Brown", Name = "Jerry", Type = "Fly"
};
myHashset.Add(myAnimal);
myHashset.Add(myOtherAnimal);
var lSDictionary = new Dictionary <int, List <string> >();
var strings = new List <string>()
{
"A string 1",
"X string 2",
"A String 3",
"X String 4",
"A String 5",
"X String 6",
};
// var results = strings.Contains("string 2");
// Console.WriteLine($"{results}");
strings.Add("Added Me");
var myResult = strings.Contains("Add Me");
var stringsThatStartWithA = strings
.Where(currentString => currentString.StartsWith("A"));
Console.WriteLine("Strings that start with A are...");
Console.WriteLine($"{stringsThatStartWithA}");
//
var firstWordThatStartsWithA = strings
.First(returnedString => returnedString.StartsWith("A"));
Console.WriteLine("First String that starts with A is...");
Console.WriteLine($"{firstWordThatStartsWithA}");
//
var secondWordThatStartWithA = strings
.Skip(1)
.Take(1);
Console.WriteLine("Second String that starts with A is...");
Console.WriteLine($"{secondWordThatStartWithA}");
//
var anyWordThatStartsWithX = strings
.Any(currentWord => currentWord.StartsWith("X"));
Console.WriteLine("Any String that starts with X is...");
Console.WriteLine($"{anyWordThatStartsWithX}");
//
var allWordsThatStartWithX = strings
.All(currentWord => currentWord.StartsWith("X"));
Console.WriteLine("All Strings that starts with X are...");
Console.WriteLine($"{allWordsThatStartWithX}");
//
var firstOrDef = strings
.FirstOrDefault(currentString => currentString.StartsWith("X"));
//
var transformedString = strings.Select(item => $"{item} - transform");
//
var transformedAnimals = strings.Select(item => new Animals {
Name = item
});
//
var letteredXAnimals = strings
.Where(currentSt => currentSt.StartsWith("X"))
.Select(item => new Animals {
Name = item
});
foreach (var an in letteredXAnimals)
{
Console.WriteLine($"{an.Name}");
}
//
var groupedStrings = strings
.GroupBy(currentString => currentString.First());
foreach (var grouping in groupedStrings)
{
/*NO VALUE*/
Console.WriteLine($"Looping over the {grouping.Key} group");
foreach (var currentString in grouping)
{
Console.WriteLine($"{currentString} is in the {grouping.Key} group");
}
}
//
var orderByStrings = strings
.OrderBy(currentString => currentString.Last());
// OrderByDescending
}