C# 控制檯關閉回調函數，修改（防止被自動優化）

經過IL發現代碼被優化

#region kernel32
//委託
private delegate int ConsoleCtrlDelegate(int CtrlType);
//winApi
[DllImport("kernel32.dll")]
private static extern int SetConsoleCtrlHandler(ConsoleCtrlDelegate ctrlDelegate, int Add);
//volatile static 變量防止優化
volatile static ConsoleCtrlDelegate consoleCtrlDelegate = new ConsoleCtrlDelegate(HandlerRoutine);
#endregion

static void Main(string[] args)
{
    int isSuccess = SetConsoleCtrlHandler(consoleCtrlDelegate, 1);
    //......
}

/// <summary>
/// 釋放Service資源
/// </summary>
/// <param name="ctrlType"></param>
/// <returns></returns>
private static int HandlerRoutine(int ctrlType)
{
    switch (ctrlType)
    {
        case 0:
            dispose();
            break;
        case 2:
            dispose();
            break;
    }
    return 0;
}