Question

我有以下内容：

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
}

如何将可选参数传递给委托？我的想法就是：

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

Answer 1

您可以使用委托方法中的可选参数来实现您正在寻找的内容，并通过Invoke方法传递参数。之前的答案显示了如何做到这一点：Can a Delegate have an optional parameter?

如何使用可选参数调用委托？

1 个答案: