如何调用字典中存储的动作？ [英] How to call an action stored in Dictionary?

问题描述

我正在尝试设置一个字典，然后将其键存储为 listbox 中的项目。

I am attempting to setup a dictionary that will then have its keys stored as items in a listbox.

我已经能够建立一个字典，然后有键输入列表框，但我不知道如何执行与键相关联的操作。从上一个线程中，有一个建议，但我遇到了问题：原始主题

I have been able to establish a dictionary that then has its keys entered in the listbox, but I'm not sure how to then execute the action associated with the key. From the previous thread there was a recommendation, but I've ran into issues with it: Original Thread

Dictionary<string, Action> dict = new Dictionary<string, Action>();
public void SetDictionary()
    {
       //add entries to the dictionary
        dict["cat"] = new Action(Cat);
        dict["dog"] = new Action(Dog);

        //add each dictionary entry to the listbox.
        foreach (string key in dict.Keys)
        {
            listboxTest.Items.Add(key);
        }                            
    }

     //when an item in the listbox is double clicked
     private void listboxTest_DoubleClick(object sender, EventArgs e)
     {
         testrun(listboxCases.SelectedItem.ToString());             
     }

     public void testrun(string n)
     {
         //this is supposed to receive the item that was double clicked in the listbox, and run it's corresponding action as defined in the dictionary.
         var action = dict[n] as Action action();
     }

我相信我上面的代码大都是正确的，我理解它，但是action action（）;行动行：

I believe that my code above is mostly correct and that I'm understanding it, however the action line:

var action = dict[n] as Action action();

显示一条错误，指出'action'是期待一个';'。我的逻辑在这里准确吗？如果是这样，为什么动作调用不正确？

Shows an error stating 'action' is expecting a ';'. Is my logic here accurate? If so, why is the action call incorrect?

推荐答案

你缺少一个; ：

var action = dict[n] as Action; action();
                              ↑

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