using System;

public class EventLeakExample
{
    public event EventHandler MyEvent;

    public void Subscribe()
    {
        MyEvent += MyEventHandler;
    }

    public void Unsubscribe()
    {
        // 忘記移除事件處理器
        // MyEvent -= MyEventHandler;
    }

    private void MyEventHandler(object sender, EventArgs e)
    {
        Console.WriteLine("Event handled.");
    }
}

class Program
{
    static void Main(string[] args)
    {
        EventLeakExample example = new EventLeakExample();
        example.Subscribe();

        // 模擬對(duì)象不再需要，但未正確釋放
        // example.Unsubscribe();

        // 如果不調(diào)用Unsubscribe方法，會(huì)導(dǎo)致內(nèi)存泄漏
        // 事件處理器仍然保持對(duì)example對(duì)象的引用，使其無法被垃圾回收

        example = null; // 此時(shí)example對(duì)象應(yīng)該被釋放，但由于事件處理器未移除，可能導(dǎo)致內(nèi)存泄漏

        // 進(jìn)行垃圾回收，可能無法釋放example對(duì)象
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();

        Console.WriteLine("Memory leak check complete. Press any key to exit.");
        Console.ReadKey();
    }
}

using System;
using System.Runtime.InteropServices;

public class UnmanagedLeakExample
{
    [DllImport("kernel32.dll")]
    private static extern IntPtr LocalAlloc(int uFlags, IntPtr uBytes);

    [DllImport("kernel32.dll")]
    private static extern IntPtr LocalFree(IntPtr hMem);

    private IntPtr _unmanagedMemory;

    public void AllocateMemory()
    {
        // 分配非托管內(nèi)存
        _unmanagedMemory = LocalAlloc(0x40, new IntPtr(1000)); // LPTR: zero-initialized, 1000 bytes
    }

    public void FreeMemory()
    {
        // 釋放非托管內(nèi)存
        if (_unmanagedMemory != IntPtr.Zero)
        {
            LocalFree(_unmanagedMemory);
            _unmanagedMemory = IntPtr.Zero;
        }
    }

    ~UnmanagedLeakExample()
    {
        // 在析構(gòu)函數(shù)中釋放非托管資源
        FreeMemory();
    }
}

class Program
{
    static void Main(string[] args)
    {
        UnmanagedLeakExample example = new UnmanagedLeakExample();
        example.AllocateMemory();

        // 在使用后未釋放非托管資源
        // example.FreeMemory();

        example = null; // 此時(shí)example對(duì)象應(yīng)該被釋放，但由于未釋放非托管資源，可能導(dǎo)致內(nèi)存泄漏

        // 進(jìn)行垃圾回收，可能無法釋放example對(duì)象
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();

        Console.WriteLine("Memory leak check complete. Press any key to exit.");
        Console.ReadKey();
    }
}