Question

I have a basic C# console application that reads a text file (CSV format) line by line and puts the data into a HashTable. The first CSV item in the line is the key (id num) and the rest of the line is the value. However I’ve discovered that my import file has a few duplicate keys that it shouldn’t have. When I try to import the file the application errors out because you can’t have duplicate keys in a HashTable. I want my program to be able to handle this error though. When I run into a duplicate key I would like to put that key into a arraylist and continue importing the rest of the data into the hashtable. How can I do this in C#

Here is my code:

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private static Hashtable importFile(Hashtable myHashtable, String myFileName) {

        StreamReader sr = new StreamReader(myFileName);         CSVReader csvReader = new CSVReader();         ArrayList tempArray = new ArrayList();         int count = 0;          while (!sr.EndOfStream)         {             String temp = sr.ReadLine();             if (temp.StartsWith(' '))             {                 ServMissing.Add(temp);             }             else             {                 tempArray = csvReader.CSVParser(temp);                 Boolean first = true;                 String key = '';                 String value = '';                  foreach (String x in tempArray)                 {                     if (first)                     {                         key = x;                         first = false;                     }                     else                     {                         value += x + ',';                     }                 }                 myHashtable.Add(key, value);             }             count++;         }          Console.WriteLine('Import Count: ' + count);         return myHashtable;     } 

Answer 1

if (myHashtable.ContainsKey(key))     duplicates.Add(key); else     myHashtable.Add(key, value);