方法必须在我的代码中具有指向NewCall Handler类的返回类型。 我在想什么

Question

In the class i am defining a method called NewCallHandler. Even though i am calling this function inside another method, but it gives me error: method must have return type .

class CallHandler
{

      public NewCallHandler(ICall call)
       {
        _call = call;
        _phoneCallAudioSender = new PhoneCallAudioSender();
        _phoneCallAudioSender.AttachToCall(call);
        _mediaConnector = new MediaConnector();
        _greetingMessageTimer = new Timer();
        _greetingMessageTimer.Elapsed += greetingMessageTimer_Elapsed;
        _greetingMessageTimer.Interval = 15000;
       }

here in this method of lowerMenu i am calling NewCallHandler function in the var variable

private void LowerMenu()
    {
        _call.CallStateChanged -= call_CallStateChanged;
        _call.DtmfReceived -= call_DtmfReceived;
        _greetingMessageTimer.Elapsed -= greetingMessageTimer_Elapsed;

        var  newCallHandler = NewCallHandler(_call);
        newCallHandler.BlindTransferNumber(_blindTransferNumber);
        newCallHandler.Completed += newCallHandler_Completed;
        newCallHandler.Start();
    }
}

i know this question has been asked before but can't find solution for my problem. Plz help me out in this matter. Thanks

Answer 1

it looks like you are defining a constructor, by the way you are instantiating class level variables inside your method. You even appear to do dependency injection, so I'm pretty sure this is intended to be a constructor.

A constructor name has to be the same name as the class. you should rename your constructor to:

public CallHandler(ICall call)

Then, you would call it with:

var callHandler = new CallHandler(_call);

notice the new keyword.

Besides constructors, all methods must have a return type. The compiler sees that your method isn't a constructor due to the name, assumes it's a normal method, and produces the error you see.

Answer 2

Methods have to have a return type declared or you have to use the keyword void if you don't want that method to return anything.

So change it to:

public void NewCallHandler(ICall call)

Answer 3

Are you expecting something from that method? If not you need to use void after public, otherwise you need put the type that you need to be returned.