索引和长度必须指向字符串中的位置。 [英] Index and length must refer to a location within the string.

问题描述

我正在提取一个像这个字符串的字符串xValue = final [6] [1] .Substring（0,6）;



当值为0.9789时没有显示任何错误，但如果值是某个整数，如14，它给索引和长度必须引用字符串异常中的位置。但我怎么能处理这两种情况？



string [] [] final = ListofSpectraImagesForAllLocation.ElementAt（index）.Value;

I am extracting a substring like this string xValue = final[6][1].Substring(0, 6);

when the value is 0.9789 it is not showing any error but if the value is some integer like 14 it is giving Index and length must refer to a location within the string exception.But how can i handle both the situations?

string[][] final = ListofSpectraImagesForAllLocation.ElementAt(index).Value;

推荐答案

你可以调用.ToString（＃。000000）确保它始终至少具有您需要的小数位数。



但是，我仍然建议解析小数可能不是一个好主意，它将有助于知道你实际上想要做什么。似乎应该有更好的方法。

You can call .ToString("#.000000") to make sure it always has at least the number of decimal places you need.

However, I still suggest that parsing decimals is probably not a good idea and it would help to know what you are actually trying to do. Seems like there should be a better way.

你的var是int将它改为字符串

your var is int change it to string

xValue = final[6][1].ToString().Substring(0, 6);

控制错误

control error

int final;
          int  len = final.ToString().Length;
            if (len < 6)
            {
                xValue = final[6][1].ToString().Substring(0, len);
            }
            else
            {
                xValue = final[6][1].ToString().Substring(0, 6);
            }

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