c# - 如何在C#中调试System.ArgumentOutOfRangeException错误？

Question

该代码应该获取两个样本(一个原始样本和一个新样本)，然后确定已插入到第一个序列中的最小单个连续片段的长度。

尝试一些样本时，出现以下错误消息:

System.ArgumentOutOfRangeException: 'Index and length must refer to a place within the string. Parameter name: length

这是代码:

class Program
{

    static void Main(string[] args)
    {
        Console.WriteLine(GetSample());
        Console.ReadKey();
    }

    public static int GetSample()
    {
        string sample1 = Console.ReadLine();
        string sample2 = Console.ReadLine();


        if (sample1 == sample2) return 0;

        if (sample1.Length >= sample2.Length)
        {
            for (int i = 0; i < sample2.Length; i++)
            {
                if (!(sample1[i] == sample2[i]))
                {

                    sample1 = sample1.Substring(i, sample1.Length);
                    sample2 = sample2.Substring(i, sample2.Length);
                    break;
                }
            }

            int var = sample1.Length - sample2.Length;
            for (int i = sample2.Length - 1; i >= 0; i--)
            {
                if (sample2[i] == sample1[i + var])
                    sample2 = trimlast(sample2);
            }
        }
        else
        {
            for (int i = 0; i < sample1.Length; i++)
            {
                if (!(sample1[i] == sample2[i]))
                {
                    sample1 = sample1.Substring(i, sample1.Length);
                    sample2 = sample2.Substring(i, sample2.Length);
                    break;

                }
            }
            int var = sample2.Length - sample1.Length;
            for (int i = sample1.Length - 1; i >= 0; i--)
            {
                if (sample2[i + var] == sample1[i])
                    sample2 = trimlast(sample2);
            }
        }
        return sample2.Length;

    }
    public static string trimlast(string str)
    {
        return str.Substring(0, str.Length - 1);
    }
}

}

Answer 1

问题是:

sample1 = sample1.Substring(i, sample1.Length);

和其他类似的方法调用。 Substring的第二个参数是长度(即要为子字符串检索的字符数)。因此，如果i大于0，则在这种情况下它将失败，因为该方法将尝试检索字符串中没有的字符。