I have a generic type which is basically a wrapper for another class (for serialization purposes), ChildFolder<SomeType>. 

    [Serializable]
    public class Ch,c#,json,unity3d,json.net"/>
	














    

		

        

            
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首页  > 解决方案 > 投射通用 ChildFolder到子文件夹?

I have a generic type which is basically a wrapper for another class (for serialization purposes), ChildFolder<SomeType>. 



    [Serializable]
    public class Ch












c# - 投射通用 ChildFolder到子文件夹?

I have a generic type which is basically a wrapper for another class (for serialization purposes), ChildFolder<SomeType>. 



    [Serializable]
    public class Ch





问题描述



I have a generic type which is basically a wrapper for another class (for serialization purposes), ChildFolder<SomeType>. 



    [Serializable]
    public class ChildFolder<T>
    {
        public T value;
    }




I have a reference to a ChildFolder<> which is currently type object. I need to be able to access that object's .value, no matter what T is - getting it as an object is perfect. I was hoping that generic types would follow the heritability rules of the parameter class, so that this would work:



object obj = new ChildFolder<SomeClass>(); // (this is equivalent to what's coming in to the function as a parameter)

ChildFolder<object> chObj = (ChildFolder<object>)obj;
// and now chObj.value is of type object




But this line gives me InvalidCastException: Specified cast is not valid.



How can I typecast to ChildFolder if I don't know what the <T> is? Alternately, how can I access .value without typecasting it?







Using WebAudio to play a sequence of notes - how to stop asynchronously?


I am using WebAudio to play a sequence of notes. I have a playNote function which works well; I send it note frequency and start and stop times for each note. The generation of the sequence parameters occurs before the actual sound starts, which is a little confusing. The function just creates an oscillator for every note. (I tried other methods and this is the cleanest).



But I would like to stop the sequence asynchronously (e.g. when an external event occurs). I tried setting up a master Gain node that could be used to gate the output, but it seems it needs to be "inside" the function, so it can't be controlled later on. If I try and turn off my gain object inside the function then it is too late - because the start & stop times have already been passed to the function.



Here is my function:



function playNote(audioContext,frequency, startTime, endTime, last) {
  gainNode = audioContext.createGain(); //to get smooth rise/fall
  oscillator = audioContext.createOscillator();
  oscillator.frequency.value=frequency;
  oscillator.connect(gainNode);
  gainNode.connect(analyserScale); //analyser is global
  analyserScale.connect(audioContext.destination);
  gainNode.gain.exponentialRampToValueAtTime(toneOn,  startTime + trf);
  gainNode.gain.exponentialRampToValueAtTime(toneOff, endTime+trf);
  oscillator.start(startTime);
  oscillator.stop(endTime);
}




Any help appreciated!


标签： c#jsonunity3djson.net


解决方案









更新：我通过创建一个非泛型基类解决了这个问题：



    [Serializable]
    public class ChildFolder<T> : ChildFolderBase
    {
        public T value
        {
            get
            {
                return (T)valueAsObject;
            }
            set
            {
                valueAsObject = value;
            }
        }

        public static implicit operator T(ChildFolder<T> cf)
        {
            return cf.value;
        }
    }

    public class ChildFolderBase
    {
        public object valueAsObject;
    }




我可以轻松地转换为 ChildFolderBase 并获取 .valueAsObject。










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