c# - 为什么不必返回此数组？

Question

我指的是本网站上的代码:http://www.dotnetperls.com/fisher-yates-shuffle

public static void Shuffle<T>(T[] array)
{
    var random = _random;
    for (int i = array.Length; i > 1; i--)
    {
        // Pick random element to swap.
        int j = random.Next(i); // 0 <= j <= i-1
        // Swap.
        T tmp = array[j];
        array[j] = array[i - 1];
        array[i - 1] = tmp;
    }
}

为什么Shuffle<T>(T[] array)中的数组不是必须要返回吗？我想为了改变一个变量的传入值，并让它影响调用它的方法中的变量，你必须使用 ref .那么为什么没有ref呢？正在使用？

Answer 1

来自 http://msdn.microsoft.com/en-us/magazine/cc301755.aspx

Arrays are mechanisms that allow you to treat several items as a single collection. The Microsoft® .NET Common Language Runtime (CLR) supports single-dimensional arrays, multidimensional arrays, and jagged arrays (arrays of arrays). All array types are implicitly derived from System.Array, which itself is derived from System.Object. This means that all arrays are always reference types which are allocated on the managed heap, and your app's variable contains a reference to the array and not the array itself.

因为它们是引用类型，所以所讨论的函数正在接收对数组的引用。