Remove Duplicate Words from String C#

remove duplicate words from string c#

Introduction

In this blog, we will learn how to remove duplicate words from the String using for loop in C#.

Add namespace using System.Text

string SetenceString = "red white black white green yellow red red black white";
            string[] data = SetenceString.Split(' ');
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < data.Length; i++)
            {
                string temp = " ";
                if (i == 0)
                {
                    temp = data[i].ToString();
                    sb = sb.Append(temp + " ");

                }
                else
                {
                    for (int j = 1; j < data.Length; j++)
                    {
                        string temp2 = data[j].ToString();
                        string strnew = sb.ToString();
                        string[] Kdata = strnew.Split(' ');
                        bool isnoduplicate = false;
                        for (int k = 0; k < Kdata.Length; k++)
                        {
                            string temp3 = Kdata[k].ToString();
                         
                          if (temp3 != "")
                            {
                                if (temp2 == temp3)
                                {
                                    isnoduplicate = false;
                                    break;
                                }
                                else
                                {
                                    isnoduplicate = true;
                                }
                            }
                        }
                        if (isnoduplicate)
                        {
                            sb = sb.Append(temp2 + " ");
                        }

                    }
                }
            }
            Console.WriteLine(sb);
            Console.ReadKey();

using Linq

Add namespace using System.Linq

string str = "One Two Three One";
      string[] arr = str.Split(' ');
      Console.WriteLine(str);
      var a =
      from k in arr
      orderby k
      select k;
      Console.WriteLine("After removing duplicate words...");
      foreach(string res in a.Distinct()) {
         Console.Write(" " + res.ToLower());
      }