How do I remove comma seperated specific value from a string ?

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string Batches = ",,H104001002,H104001003,H104001004,H104001005";

I have this string and i have to remove "H104001002" from the above string in ASP.Net C#.

What I have tried:

I was thinking to use Contains to find the string and Replace to replace it with ""

Posted 19-Jul-16 21:40pm

Abrar Kazi

Updated 9-Aug-16 0:01am

v2

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Hein Pauwelyn 20-Jul-16 4:03am

Why shouldn't it work by replacing? Anyway, you could also try to use regex. https://msdn.microsoft.com/en-us/library/xwewhkd1(v=vs.110).aspx

4 solutions

Solution 4

you can split by,

C#

string[] namesArray = "Tom,Scott,Bob".Split(',');

Posted 9-Aug-16 0:01am

Member 10062432

Comments

Maciej Los 9-Aug-16 10:44am

My vote of 1. Split method will return the array of strings. OP wants to remove specific element in from comma separeted string.

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OriginalGriff · Accepted Answer · 2016-07-19T22:06:00

It depends exactly what you are trying to do: removing an absolute value (one that never changes) is trivial:

C#

string Batches = ",,H104001002,H104001003,H104001004,H104001005";
string changed = Batched.Replace("H104001002", "");

will do it.
But...if string isn't "fixed" or can appear in other places in the data correctly, then that isn't a viable alternative. For example, usign that method on this:

C#

string Batches = ",,H104001002,H104001003,H104001002,H104001005"

Would give you:

",,,H104001003,,H104001005"

There are a number of ways to do it: you could split the string, kill the "bad" location, and rebuild it:

C#

string Batches = ",,H104001002,H104001003,H104001004,H104001005";
string[] parts = Batches.Split(',');
parts[2] = "";
string changed = string.Join(",", parts);

Or you could use a Regex:

C#

string Batches = ",,H104001002,H104001003,H104001004,H104001005";
string changed = Regex.Replace(Batches, @"(?<=\,\,).+?(?=,)", "");

But...I'd suggest that you look at using an existing CSV parser: A Fast CSV Reader[^] is a good choice.

Hein Pauwelyn · Accepted Answer · 2016-07-19T22:08:00

You could try to use regular expressions (or regex). In your case the code will be this:

C#

using System;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string input = ",,H104001002,H104001003,H104001004,H104001005"
      string pattern = "H104001002";
      string replacement = "";
      Regex rgx = new Regex(pattern);
      string result = rgx.Replace(input, replacement);

      Console.WriteLine("Original String: {0}", input);
      Console.WriteLine("Replacement String: {0}", result);                             
   }
}

Karthik_Mahalingam · Accepted Answer · 2016-07-19T22:58:00

C#

// using simple Replace method.
     string Batches = ",,H104001002,H104001003,H104001002,H104001004,H104001005";
     string find = "H104001002";
     Batches = Batches.Replace(find, "");


     // using Array/List to replace it, this will remove the empty items
     List<string> lst = new List<string>();
     var array = Batches.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
     if(array.Contains(find))
         for (int i = 0; i < array.Length; i++)
         {
             if (array[i] != find)
                 lst.Add(array[i]);
         }
     Batches = string.Join(",", lst);

     // using Linq
    Batches= string.Join(",", Batches.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries).Where(k => k != find).ToArray());

How do I remove comma seperated specific value from a string ?

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