Question

我正在尝试创建一个操作字典，然后在循环中运行它们。 This问题有帮助，但在将操作添加到词典时仍然出现编译错误： - No overload for 'Action' matches delegate 'Action'.

感谢您的帮助。

Dictionary<string, Action> dActions = new Dictionary<string, Action>();
            // do the actions need to be created?
            Action<string, int> actSpot = new Action<string, int>(oBSM.Spot);
            Action<string, int> actDelta = new Action<string, int>(oBSM.Delta);
            dActions["Spot"] = new Action(actSpot);
            dActions["Delta"] = new Action(actDelta);

            // or add action to dictionary?
            dActions.Add("Spot", oBSM.Spot(string BookOrComp, int DP);
            dActions.Add("Delta", oBSM.Delta(string BookOrComp, int DP);

            foreach (var BookOrComp in ListBookOrComp)
            {
                foreach (string Key in dActions.Keys)
                {
                    for (int DP = 1; DP <= 21; DP++)
                    {
                        dActions[Key]();
                    }
                }
            }

更新：我仍然会在代码

中看到一些编译错误

Dictionary<string, Action> dActions = new Dictionary<string, Action>();
            // create actions
            Action<string, int> actSpot = new Action<string, int>(oBSM.Spot);  
            Action<string, int> actDelta = new Action<string, int>(oBSM.Delta);  
            dActions["Spot"] = new Action(actSpot); // no overload for Action matches delegate Action
            dActions["Delta"] = new Action(actDelta); // ditto


            foreach (var BookOrComp in ListBookOrComp)
            {
                foreach (string Key in dActions.Keys)
                {
                    for (int DP = 1; DP <= 21; DP++)
                    {
                        dActions[Key](BookOrComp,DP);  // delegate Action  does not take 2 arguments
                    }
                }
            }

Answer 1

我在你的程序中看到了许多错误：

1-括号不平衡：

        // or add action to dictionary?
        dActions.Add("Spot", oBSM.Spot(string BookOrComp, int DP);
        dActions.Add("Delta", oBSM.Delta(string BookOrComp, int DP);

您需要在那里添加右括号。此外，我不确定该语法是否正确，我创建了一个对象，然后将其添加到字典中。

2-该操作采用两个参数：一个字符串和一个int：

        Action<string, int> actSpot = new Action<string, int>(oBSM.Spot);
        Action<string, int> actDelta = new Action<string, int>(oBSM.Delta);

但你现在正在使用参数调用它：

         foreach (var BookOrComp in ListBookOrComp)
        {
            foreach (string Key in dActions.Keys)
            {
                for (int DP = 1; DP <= 21; DP++)
                {
                    dActions[Key](); // <<<-- where are the parameters?
                }
            }
        }

我认为这是编译器抱怨的错误。

更新2：

Dictionary<string, Action> dActions = new Dictionary<string, Action>();

应定义为：

Dictionary<string, Action<string, int>> dActions

=新词典＆gt;（）;

和

        dActions["Spot"] = new Action(actSpot); // no overload for Action matches delegate Action

应该是

        dActions["Spot"] = actSpot; // actSpot already created with new Action...

或：

        dActions["Spot"] = new Action<string, int>(oBSM.Spot);

PS：

当你这样做时，你必须明白：

        dActions["Delta"] = new Action(actDelta); // ditto

您正在调用Action的构造函数，其参数类型为Action<string. int>，而Action没有该构造函数。

创建并运行操作字典

1 个答案: