public class Lib

{

        public delegate void UserFunctionCB();

        private static UserFunctionCB m_userFnCB;

        /// <summary>

        /// 初始化时把需要回调的函数传入

        /// </summary>

        /// <param name="func"></param>

        public static void InitCallbackFunction(UserFunctionCB func)

        {

            m_userFnCB = func;

        }

        /// <summary>

        /// 当程序出现异常时会自动触发此函数

        /// （在这里我就不过多的描述异常捕获的过程了）

        /// </summary>

        /// <param name="func"></param>

        public static void HandleExceptionForNDK()

        {

            // 出现异常时调用用户自定义函数

            CallUserFunction();

        }

        /// <summary>

        /// 回调执行用户设置的函数

        /// </summary>

        private static void CallUserFunction()

        {

            if (m_userFnCB != null)

            {

                IAsyncResult result = m_userFnCB.BeginInvoke(delegate(IAsyncResult ar)

                {

                    m_userFnCB.EndInvoke(ar);

                }, null);

                // 执行50毫秒后超时

                result.AsyncWaitHandle.WaitOne(, true);

            }

        }

}

public class Demo

{

    void Start()

    {

        var m_callbackFn = new Lib.UserFunctionCB(CallBackFunction);

        Lib.InitCallbackFunction(m_callbackFn);

    }

    /// <summary>

    /// 回调函数实现部份

    /// </summary>

    private void CallBackFunction()

    {

         Debug.LogError("print of call back function!");

    }

}