//初始化  根据SystemFunctions包含的类去加载
        private void Init()
        {
            Type type    = typeof(SystemFunctions);
            var  methods = type.GetMethods(BindingFlags.Public | BindingFlags.Static);

            foreach (var method in methods)
            {
                StaticFunctionInvoker invoker = new StaticFunctionInvoker(method);
                functionDict.Add(method.Name, invoker);
            }
        }
 /// <summary>
 /// 执行方法
 /// </summary>
 /// <param name="functionName">upper case</param>
 /// <param name="parameters"></param>
 /// <returns></returns>
 public static object InvokeFunction(string functionName, object[] parameters)
 {
     if (SingleLoader.functionDict.ContainsKey(functionName))
     {
         StaticFunctionInvoker f = SingleLoader.functionDict[functionName];
         return(f.invoke(parameters));
     }
     else
     {
         throw new Exception();
     }
 }