在.NET 11 中利用 C# 14 提升客户端应用安全性能的探索

using System;

class Program
{
    static void Main()
    {
        // 使用 C# 14 泛型约束
        var safeList = new SafeList<string>();
        safeList.Add("test");
        // safeList.Add(null); // 这行代码会导致编译错误

        // 使用 C# 14 属性模式匹配进行安全检查
        var user = new User { IsAdmin = false };
        if (user is { IsAdmin: true })
        {
            Console.WriteLine("User has admin rights.");
        }
        else
        {
            Console.WriteLine("User does not have admin rights.");
        }
    }
}

class SafeList<T> where T : notnull
{
    private List<T> list = new List<T>();
    public void Add(T item)
    {
        list.Add(item);
    }
}

class User
{
    public bool IsAdmin { get; set; }
}

using System;
using System.Collections.Generic;
using System.Diagnostics;

class PerformanceOptimization
{
    public static void Main()
    {
        // 优化前
        var stopwatch1 = new Stopwatch();
        stopwatch1.Start();
        var unoptimizedList = new List<int>();
        for (int i = 0; i < 1000000; i++)
        {
            unoptimizedList.Add(i);
        }
        stopwatch1.Stop();
        Console.WriteLine($"Unoptimized time: {stopwatch1.ElapsedMilliseconds} ms");

        // 优化后，利用.NET 11 运行时特性预分配内存
        var stopwatch2 = new Stopwatch();
        stopwatch2.Start();
        var optimizedList = new List<int>(1000000);
        for (int i = 0; i < 1000000; i++)
        {
            optimizedList.Add(i);
        }
        stopwatch2.Stop();
        Console.WriteLine($"Optimized time: {stopwatch2.ElapsedMilliseconds} ms");
    }
}