ArgumentIndexOutOfBounds异常string.Length [英] ArgumentIndexOutOfBounds Exception string.Length
问题描述
以下是我过去几天的一个问题。这个问题非常类似于昨天我问的一个问题，但是当我更新了这个问题时，没有人碰到过，所以我再一次提出一个新的问题。
我正在处理一个需要大文本文件的程序，将其分为两组：a和b，然后读取数据的每一行。一行数据将如下所示：
5/22/2015 12:15:55 AM |批量8 | 429/529 | 81.10％| BLV-R |加工的VLZYYL ...检查可退还的票价。传统预订。内部票务窗口。最低节省：$ 100.00。实际储蓄：1,780.60美元。发现储蓄：1,780.60美元（31.11％）。备注备案UDID写排队到0TA9 / 208 * 11。排队到0TA9 / 161 * 222。
我不会解释什么意思。但是这个程序正在研究的关键要素是Savings found：和它旁边的百分比。然而，并不是每一行都有储蓄，实际上大多数行都没有，但其中一些行。下面我有一段代码，将告诉我文件名是什么，文件有多少行，并查看一个组中的每一行，并写出有多少PNRS被处理，有多少PNRS有储蓄，什么所有具有储蓄的PNRS的百分比（百分比四舍五入到3位小数），然后如果百分比为30％或更大，它应该写出具有储蓄发现：的每一行，它将在该行的前面加上一个星号。如果节省30％或更多，节省$ 500或以上，那么它将在该行的前面放置两个星号。下面我有一个例子，总体输出应该是和我迄今为止的代码：
控制台想法：
文件名称：PNRS
总数：123,123
组：A
总PNRS：123
PNRS带储蓄：23
％带储蓄： 10％
* 5/21/2015 11:55:56 PM |批量6 | 386/767 | 50.33％| CH2M-R |加工NXRMN5 ...检查可退还和不可退还的票价。传统预订。内部票务窗口。最低节省：$ 131.00。实际节省：$ 257.18。发现储蓄：$ 257.18（11.55％）。以前发现储蓄。
2015-234wefsaf LINE GOES HERE ** 2015 LINES
组：B同一格式作为组A
我一直在努力的代码：
using System;
使用System.Collections.Generic;
使用System.Linq;
使用System.Text;
使用System.Threading.Tasks;
使用System.IO;
使用System.Linq;
命名空间DanProject
{
class Program_Origional
{
static void Main（string [] args）
{
//以下系列代码是phase1
try
{
string path = @c：\users\povermyer\documents\visual studio 2013 \Projects\\ \\DanProject\PNRS\PNRS.log;
if（！File.Exists（path））
{
//Console.WriteLine(\"File not Found）;
抛出新的FileNotFoundException（）;
}
else
{
string [] lines = System.IO.File.ReadAllLines（path）;
var count = File.ReadLines（path）.Count（）;
列表< string> a = lines.Take（7678）.ToList（）;
列表< string> s = lines.Skip（7678）.Take（5292）.ToList（）;
Console.WriteLine（System.IO.Path.GetFileNameWithoutExtension（path））;
Console.WriteLine（lines.Count（））;
if（a.Any（item => item.Contains（Savings found））
{
Console.WriteLine（\\\
Group一个）;
var aPNRSThatWereProcessed = a.Count（line => line.Contains（Processed））;
Console.WriteLine（在）中处理了+ aPNRSThatWereProcessed +PNRS。
//代码查找储蓄
int aPNRSWhereSavingsWereFound = a.Count（line => line.Contains（Savings found：）） ;
Console.WriteLine（在一个，有+ aPNRSWhereSavingsWereFound +PNRS有节省）;
//找到一个
十进制百分比的代码aPercentage =（（decimal）aPNRSWhereSavingsWereFound / aPNRSThatWereProcessed * 100）;
decimal result1 = Math.Round（aPercentage，3）;
Console.WriteLine（节省的PNRS的百分比是+ result1 +％）;
string find =储蓄找到：;
foreach（var line in a.Where（w => w.Contains（find）））
{
var subStr = line.Substring（0，line.IndexOf（find）+ find.Length）;
var startIndex = subStr.IndexOf（'（'）;
var endIndex = subStr.IndexOf（'）'）;
var savings = double.Parse（subStr.Substring（2，startIndex - 1）.Trim（））;
var percent = double.Parse（subStr.Substring（startIndex + 1，endIndex - startIndex - 2）.Trim（））;
Console.WriteLine（{0} {1} {2}，（percent> = 30）？*：string.Empty，
= 30&& Saving> = 500）？*：string.Empty，
line）;
}
}
}
}
catch（Exception ex）
{
Console.WriteLine（ex.ToString（））;
}
finally
{
Console.ReadKey（）;
}
}
}
}
我的问题在于foreach循环。以上所有foreach循环都是完美的，然后当我编译这个，我得到这个确切的错误信息：
System.ArgumentOutOfRangeException：Length不能小于零。参数名称：System.String.Substring（Int32，startIndex，Int32，length）的长度
（我正在使用的文本文件的真长文件名）：第66行
正如我所看到的那样，问题在于.Length语句，但是当我尝试用（）修复它时，VS对我大声说，我不能这样做。它表示不可调用的成员string.Length不能像方法一样使用。
现在我已经具体了，尽可能详细，请帮忙我在弄清楚如何摆脱这个问题，让这个控制台应用程序滚动！
然后@ steve16351告诉你有什么问题。
你正在做 var subStr = line.Substring（0，line.IndexOf（find）+ find.Length）;
这将返回'找到储蓄'
你想要的东西像
var subStr = line.Substring（line.IndexOf（find）+ find.Length）;
哪些会在找到储蓄后给你所有的东西
$ b $告诉你，这将是一个Doh时刻。 ：）
Below is a problem that I have been having the past couple of days. This question is very similar to one I asked yesterday, but when I updated the question no one touched it so I am asking it again in a new question.
I am working on a program that takes a large text file, splits it into 2 groups: a and b, and then reads each line of the data. A line of data will look like this:
5/22/2015 12:15:55 AM | Batch 8|429/529|81.10 %|BLV-R|Processed VLZYYL...Checking refundable fares. Traditional Booking. Inside ticketing window. Minimum Savings Required: $100.00. Actual Savings: $1,780.60. Savings found: $1,780.60 (31.11 %). Remark written. UDID written. Queued to 0TA9/208*11. Queued to 0TA9/161*222.
I am not going to explain what everything means. But the key elements that this program is looking at is "Savings found:" and the percent that is next to it. Not every line however has savings, actually most of the lines do not, but some of them do. Below I have a piece of code that will Tell me what the file name is, how many lines the file has, and look at every line in the a group and write out how many PNRS were processed, how many PNRS have savings, what the percent of all the PNRS that had savings(Percent rounded to 3 decimals) and then it is supposed to write out every line that has "Savings found:" if the percent is 30% or greater, it will place an asterisk infront of the line. If it has 30% or greater savings and has $500 or more in savings, then it will place two asterisks in the front of that line. Below I have an example of what the overall output should be and the code that I have thus far:
Console Idea:
FIle Name: PNRS
Total Lines: 123,123
Group: A
Total PNRS: 123
PNRS With Savings: 23
% With Savings: 10%
* 5/21/2015 11:55:56 PM | Batch 6|386/767|50.33 %|CH2M-R|Processed NXRMN5...Checking refundable and non-refundable fares. Traditional Booking. Inside ticketing window. Minimum Savings Required: $131.00. Actual Savings: $257.18. Savings found: $257.18 (11.55 %). Savings were previously found.
2015-234wefsaf LINE GOES HERE** 2015 LINES
Group: B SAME FORMAT AS GROUP A
Code that I have been working on:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Linq;
namespace DanProject
{
class Program_Origional
{
static void Main(string[] args)
{
//the following series of code is phase1
try
{
string path = @"c:\users\povermyer\documents\visual studio 2013\Projects\DanProject\PNRS\PNRS.log";
if (!File.Exists(path))
{
//Console.WriteLine("File Not Found");
throw new FileNotFoundException();
}
else
{
string[] lines = System.IO.File.ReadAllLines(path);
var count = File.ReadLines(path).Count();
List<string> a = lines.Take(7678).ToList();
List<string> s = lines.Skip(7678).Take(5292).ToList();
Console.WriteLine(System.IO.Path.GetFileNameWithoutExtension(path));
Console.WriteLine(lines.Count());
if (a.Any(item => item.Contains("Savings found")))
{
Console.WriteLine("\nGroup a\n");
var aPNRSThatWereProcessed = a.Count(line => line.Contains("Processed"));
Console.WriteLine("There were " + aPNRSThatWereProcessed + " PNRS that were processed in a");
//code to find number of savings
int aPNRSWhereSavingsWereFound = a.Count(line => line.Contains("Savings found:"));
Console.WriteLine("In a, there were " + aPNRSWhereSavingsWereFound + " PNRS that had savings");
//code to find percentage for a
decimal aPercentage = ((decimal)aPNRSWhereSavingsWereFound / aPNRSThatWereProcessed *100);
decimal result1 = Math.Round(aPercentage, 3);
Console.WriteLine("The percentage of PNRS in a that had savings were " + result1 + "%");
string find = "Savings found:";
foreach (var line in a.Where(w => w.Contains(find)))
{
var subStr = line.Substring(0, line.IndexOf(find) + find.Length);
var startIndex = subStr.IndexOf('(');
var endIndex = subStr.IndexOf(')');
var savings = double.Parse(subStr.Substring(2, startIndex - 1).Trim());
var percent = double.Parse(subStr.Substring(startIndex + 1, endIndex - startIndex - 2).Trim());
Console.WriteLine("{0}{1}{2}", (percent >= 30) ? "*" : string.Empty,
(percent >= 30 && savings >= 500) ? "*" : string.Empty,
line);
}
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
Console.ReadKey();
}
}
}
}
My problem lies within the the foreach loop. Everything above that foreach loop is working perfect, and then when I compile this, I am getting this exact error message: System.ArgumentOutOfRangeException: Length cannot be less than zero. Parameter name: length at System.String.Substring(Int32, startIndex, Int32, length) at (Really long file name for the text file I am working with): line 66
As I can see, the problem is with the .Length statement, however when I try to fix it with the (), VS yells at me and says that I can't do it. It says "Non-invocable member 'string.Length' cannot be used like a method".
Now that I have been as specific, as detailed as possible, please help me in figuring out how I can get rid of this problem and get this console application rolling!
Then @steve16351 told you what the problem was.
You are doing var subStr = line.Substring(0, line.IndexOf(find) + find.Length);
which will return 'Savings found'
you want something like
var subStr = line.Substring(line.IndexOf(find) + find.Length);
Which will give you everything after 'Savings found'
Told you it would be a Doh moment. :)
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