C# console close callback function, modify (to prevent automatic optimization)

Found that the code is optimized through IL

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

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

/// <summary>
/// 释放Service资源
/// </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;
}

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