如何使用可選參數調用委託？

Question

我有以下幾點：

var availableDelegates = new Dictionary<string, SampleHandler>{ 
    {"TestWithNoParams", SampleHandlerOne }, // this is what I have now - working 
    {"TestWithParamSetA", SampleHandlerTwo } // need this 
    {"TestWithNoParams", SampleHandlerTwo } // and this - working 
} 

public static SampleHandler SampleHandlerOne(){ 
    // do stuff - working 
} 

// v1 
public static SampleHandler SampleHandlerTwo(){ 
    // do stuff without parameters - working 
} 

// v2 
public static SampleHandler SampleHandlerTwo(HandlerTwoParams params = null) { // trying to update to support optional params 
    // do stuff with parameters - not working 
    // params.Foo = bar 
} 

如何傳遞可選參數的委託？這個想法是，我可以做：

if (someCondition) 
    availableDelegates[target].Invoke(optionalParams); 
else 
    availableDelegates[target].Invoke(); 

Answer 1

你可以實現你正在尋找與您的委託方法可選參數到底是什麼，通過Invoke方法傳遞參數。此前的答案顯示瞭如何完成此操作：Can a Delegate have an optional parameter?