c# - 如何显示作为 int[] 数组的 OrderedDictionary 条目值的值？

Question

我宁愿不在有序字典中将两个单独的值创建到单独的条目中，但如果有一种方法可以完成我在这里尝试做的事情，那就太棒了。

public OrderedDictionary spellResults = new OrderedDictionary()
{
    {"Test",new int[]{5,7}}
};

public void Main()
{
    //i'm trying to display the integers within "spellResults["Test"]" but i have no idea how i would accomplish this

    int[] pval= ((Array)spellResults["Test"]) as int[];
    Console.WriteLine(pval[0]+","+pval[1]);   
}

Edit: Turns out the way I was doing it was also correct but I overlooked placing the OrderedDictionary in a class when I was using an online compiler to try and test it for the first time. Whoops, thanks for the answers anyhow.

Answer 1

foreach (var number in spellResults["Test"] as int[])
{
    Console.WriteLine(number);
}

但是，您需要先检查 spellResults["Test"] 的类型，因为如果转换为 int[] 将抛出 NullReferenceException 不成功(即它将尝试遍历 null)。您应该事先执行空检查:

var pval = spellResults["Test"] as int[];
if (pval != null)
{
    foreach (var number in pval)
    {
        Console.WriteLine(number);
    }
}

要以 CSV 格式打印数字，按照原始片段，只需将 foreach 替换为 string.Join - 这样，您还可以避免程序抛出 IndexOutOfRangeException在运行时，如果 pval 包含少于 2 个元素:

if (pval != null)
{
    // this is bad, an IndexOutOfRangeException will be thrown
    // if pval contains less than 2 elements:
    // Console.WriteLine(pval[0] + "," + pval[1]);

    // use string.Join instead::
    Console.WriteLine(string.Join(",", pval));
}