c# - 我如何判断 int[] 是否尚未分配任何内容？

Question

如果我有这个:

int[] lstAFewInts = new int[NUMBER_OF_STARS_IN_THE_MILKY_WAY];

...如果方法还没有赋值，我想退出它，我该如何测试它？是吗:

if (lstAFewInts[0] == null)

...或者？？？

Answer 1

我的建议:提高抽象级别。

class LazyArray<T>
{
    private T[] array;
    private int size;
    public LazyArray(int size) { this.size = size; }
    public bool IsInitialized { get { return this.array != null; } }
    public T this[int x] 
    { 
        get 
        { 
            return this.array == null ? default(T) : this.array[x];
        }
        set
        {
            if (this.array == null) this.array = new T[size];
            this.array[x] = value;
        }
    }
}

你已经完成了:你有一个任意大小的数组，你知道它是否已经被使用过:

void M()
{
    var myArray = new LazyArray<int>(whatever);
    while(whatever)
    {
        if (whatever) myArray[whatever] = whatever;
    }
    if (myArray.IsInitialized) 
        whatever;
}