解析邏輯，C＃-異常System.ArgumentOutOfRangeException

Question

我有一個巨大的數據文件，看起來像這樣：

TRANSACTION NUMBER                         AMOUNT      CNCY SVC DISPOSITION DATE/TIME          %     PT    FT    USER        LOC 
------------------------------------------------------------------------------------------------------------------------------------ 
CA150723052447000I0002                      38,078.100 CAD  BOK AUTO HOLD   23 JUL 15 17:19:53 100.0 80.0  101.0 SYSTEM      IBD 

CA150723052447000I0002  - User Actions and Comments:

User     Location Disposition          Date/Time             Comments                                                               
------------------------------------------------------------------------------------------------------------------------------------ 
IBDGWYNETH IBD      MANUAL INVQ          23 JUL 15 17:20:29  inv  
------------------------------------------------------------------------------------------------------------------------------------ 


CA150724020822000I0002                      36,106.000 CAD  BOK AUTO HOLD   24 JUL 15 08:19:32 100.0 80.0  101.0 SYSTEM      IBD 

CA150724020822000I0002  - User Actions and Comments:

User     Location Disposition          Date/Time             Comments                                                               
------------------------------------------------------------------------------------------------------------------------------------ 
IBDADAM  IBD      MANUAL INVQ          24 JUL 15 08:25:17  investigate     

我正在嘗試使用值SYSTEM和101.0，因為它們對於每個Transaction Number都是一致的。 當我找到這個時，我正在使用substring函數來分隔每個細節。 現在，我只是擔心從CA1507 .... 38,078 ..... SYSTEM ..... IBD開始的行，並分隔所有屬性。

到目前為止，我的代碼在下面。 它拋出異常ArgumentOutOfRange 。 深入研究它，變量行的值=“”導致此異常。 關於如何解決此問題的任何想法？

謝謝。

Boolean IsTxnSection = false;

StreamReader file = new StreamReader(@"C:\.....);

while ((line = file.ReadLine()) != null)
{
    //Transaction details
    if (IsTxnSection)
    {
        TransactionNo = line.Substring(0, 22).Trim();
        Console.WriteLine("TrnNo", TransactionNo);
    }

    if (line.Contains("101.0") && line.Contains("SYSTEM") && line.StartsWith("CA150"))
    {
        IsTxnSection = true;
    }

    Thread.Sleep(100);
    counter++;

    if (counter == 100)
        break;
}   // end of while

file.Close();

Answer 1

你有這個：

TransactionNo = line.Substring(0, 22).Trim();

如果該行短於22個字符，則會引發該異常。 如果較短，請跳過該行：

if(string.IsNullOrWhiteSpace(line) || line.Length < 22)
    continue;

Answer 2

我解析測試文件已有40年了。 這是我一直在做的

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.txt";
        enum Section
        {
            NONE,
            TRANSACTION,
            USER
        }
        static void Main(string[] args)
        {
            Section section = Section.NONE;
            string TransactionNo = ""; 

            StreamReader file = new StreamReader(FILENAME);
            string line = "";
            while ((line = file.ReadLine()) != null)
            {
                line = line.Trim();
                if (line.Length > 0 && !line.StartsWith("---------------"))
                {
                    //Transaction details
                    switch (section)
                    {
                        case Section.NONE:
                            if(line.StartsWith("TRANSACTION NUMBER"))
                            {
                                section = Section.TRANSACTION;
                            }
                            break;
                        case Section.TRANSACTION:
                            if (!line.Contains("User Actions and Comments:"))
                            {
                                TransactionNo = line.Substring(0, 22).Trim();
                                Console.WriteLine("TrnNo : {0}", TransactionNo);
                            }
                            else
                            {
                                section = Section.USER;
                            }
                            break;
                        case Section.USER:
                            break;
                    }
                }

            }//end of while
            file.Close();
       }
    }
}


​