如何使用可选参数调用委托？

Question

我有以下几点：

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 
} 

如何传递可选参数的委托？这个想法是，我可以做：

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

Answer 1

你可以实现你正在寻找与您的委托方法可选参数到底是什么，通过Invoke方法传递参数。此前的答案显示了如何完成此操作：Can a Delegate have an optional parameter?