C#开发中如何使用集合和泛型提高代码效率

List<string> fruits = new List<string>();
fruits.Add("apple");
fruits.Add("banana");
fruits.Add("orange");

foreach (string fruit in fruits)
{
    Console.WriteLine(fruit);
}

Dictionary<int, string> students = new Dictionary<int, string>();
students.Add(1, "Tom");
students.Add(2, "Jerry");
students.Add(3, "Alice");

foreach (KeyValuePair<int, string> student in students)
{
    Console.WriteLine("ID: " + student.Key + ", Name: " + student.Value);
}

HashSet<string> colors1 = new HashSet<string> { "red", "green", "blue" };
HashSet<string> colors2 = new HashSet<string> { "blue", "yellow", "black" };

// 交集
HashSet<string> intersection = new HashSet<string>(colors1);
intersection.IntersectWith(colors2);

foreach (string color in intersection)
{
    Console.WriteLine(color);
}

public T Max<T>(T a, T b) where T : IComparable<T>
{
    if (a.CompareTo(b) > 0)
    {
        return a;
    }
    
    return b;
}

int maxInteger = Max<int>(10, 20);
string maxString = Max<string>("abc", "xyz");

public class Stack<T>
{
    private List<T> items;

    public Stack()
    {
        items = new List<T>();
    }

    public void Push(T item)
    {
        items.Add(item);
    }

    public T Pop()
    {
        T item = items[items.Count - 1];
        items.RemoveAt(items.Count - 1);
        return item;
    }
}

Stack<int> stack = new Stack<int>();
stack.Push(10);
stack.Push(20);
int top = stack.Pop();