c# - 如何将变量转换为与动态变量相同的类型？

Question

我目前正在研究一种放大方法，该方法接受 PCM 样本作为 ICollection<dynamic> (调用者只会传递以下任一集合: sbyte 、 short 或 int )。我创建的放大算法运行良好；只是我不确定如何将新放大的样本转换回其原始类型，因为放大逻辑将样本输出为 List<double> .

我知道我可以添加某种 switch声明将样本转换回原始类型，但这似乎是一个相当原始的解决方案，是否有更好的方法来完成此操作？

我如何调用该方法( samples 是 List<dynamic> 继续 int s， file 是我为读取 wav 文件而创建的类)，

AmplifyPCM(samples, file.BitDepth, 0.5f);

我的方法

static private List<dynamic> AmplifyPCM(ICollection<dynamic> samples, ushort bitDepth, float volumePercent)
{
    var highestSample = 0;
    var temp = new List<dynamic>();

    foreach (var sample in samples)
    {
        if (sample < 0)
        {
            temp.Add(-sample);
        }
        else
        {
            temp.Add(sample);
        }
    }

    foreach (var sample in temp)
    {
        if (sample > highestSample)
        {
            highestSample = sample;
        }
    }

    temp = null;

    var ratio = (volumePercent * (Math.Pow(2, bitDepth) / 2)) / highestSample; 
    var newSamples = new List<dynamic>();

    foreach (var sample in samples)
    {
        newSamples.Add(sample * ratio); // ratio is of type double, therefore implicit conversion from whatever sample's type is to a double.
    }

    // switch statement would go here if there's no better way.

    return newSamples;
}

Answer 1

好吧，您可以将其设为通用，从而给出返回类型。但 C# 不支持泛型运算符。您可以尝试将它们设置为动态。

static private List<T> AmplifyPCM<T>(ICollection<T> samples, ushort bitDepth, float volumePercent)
{
    var highestSample = 0;
    var temp = new List<T>();

    foreach (var sample in samples)
    {
        if ((dynamic)sample < 0)
        {
            temp.Add(-(dynamic)sample);
        }
        else
        {
            temp.Add(sample);
        }
    }

    foreach (var sample in temp)
    {
        if ((dynamic)sample > highestSample)
        {
            highestSample = (dynamic)sample;
        }
    }

    temp = null;

    var ratio = (volumePercent * (Math.Pow(2, bitDepth) / 2)) / highestSample;
    var newSamples = new List<T>();

    foreach (var sample in samples)
    {
        newSamples.Add((dynamic)(T)sample * ratio);
    }

    return newSamples;
}