list与数组转Hashset&SortedSet
//创建hashset去重
var hashSet = new HashSet<int>(){1,1,2,2};
Console.WriteLine("HashSet:"+String.Join(", ", hashSet));
// HashSet:1, 2
//创建list包含重复元素
var ints = new List<int>{1,1,3,3,2,2};
//创建数组转HashSe包含重复元素
int[] numbers = { 1, 1, 3, 2, 2 };
//list转HashSet
var set = ints.ToHashSet();
Console.WriteLine("List转HashSet:"+String.Join(", ", set));
//List转HashSet:1, 3, 2
var immutableSortedSet = ints.ToImmutableSortedSet();
Console.WriteLine("immutableSortedSet:"+String.Join(", ", immutableSortedSet));
//数组转HashSet
var hashSet1 = new HashSet<int>(numbers);
Console.WriteLine("数组转HashSet:"+String.Join(", ", hashSet1));
//数组转HashSet:1, 3, 2
//数组转SortedSet
var sortedSet = new SortedSet<int>(numbers);
Console.WriteLine("数组转SortedSet:"+String.Join(", ", sortedSet));
//数组转SortedSet:1, 2, 3当hashset存的是类时
创建饮料类
public class Drink
{
public String Name { get; set; }
public int Price { get; set; }
}new一个HashSet存放饮料类
var drinks = new HashSet<Drink>();
drinks.Add(new Drink{Name = "牛奶",Price = 19});
drinks.Add(new Drink{Name = "牛奶",Price = 20});
drinks.Add(new Drink{Name = "茉莉花茶",Price = 19});
drinks.Add(new Drink{Name = "茉莉花茶",Price = 19});
foreach (var drink in drinks)
{
Console.WriteLine(drink.Name+drink.Price);
}
打印出来并未去重
自定义比较规则
public class DrinkEquelityCompare : IEqualityComparer<Drink>
{
public bool Equals(Drink x, Drink y)
{
//Name相等去除
return x.Name == y.Name;
}
public int GetHashCode(Drink obj)
{
return base.GetHashCode();
}
}重新new一个类
//var drinks = new HashSet<Drink>(new DrinkEquelityCompare());
drinks.Add(new Drink{Name = "牛奶",Price = 19});
drinks.Add(new Drink{Name = "牛奶",Price = 20});
drinks.Add(new Drink{Name = "茉莉花茶",Price = 19});
drinks.Add(new Drink{Name = "茉莉花茶",Price = 19});
foreach (var drink in drinks)
{
Console.WriteLine(drink.Name+drink.Price);
}此时打印以及去除掉Name相同的值了
SortedSet存放类时自定义排序规则
还是用刚刚的Drink类
public class DrinkCompare : IComparer<Drink>
{
public int Compare(Drink x, Drink y)
{
//返回值>0 x大； 返回值=0，一样大； 返回值小于0，y大
return x.Price-y.Price;
}
}添加数据
SortedSet<Drink> sorted = new(new DrinkCompare());
sorted.Add(new Drink{Name = "橘汁",Price = 19});
sorted.Add(new Drink{Name = "牛奶",Price = 20});
sorted.Add(new Drink{Name = "茉莉花茶",Price = 17});
sorted.Add(new Drink{Name = "可乐",Price = 21});
foreach (var drink in sorted)
{
Console.WriteLine(drink.Name+drink.Price);
}打印出来的数据以及按照price进行排序了
