检查数组中的重复字符串 [英] Checking for duplicate strings in an array

问题描述

我正在使用此方法删除空条目，现在我需要检查重复项，但是我使用的是VS 2005的非常旧的版本，没有linq，所以我不能使用重复方法.你能帮忙的话，我会很高兴.谢谢！

Hi I am using this method to remove empty entries, now I need to check for duplicates but I am on a very old version of VS 2005 theres no linq I can''t use the duplicate method. Any help would be nice. Thank!

String[] hostName = htbclb.Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);

推荐答案

您可以调整解决方案以使其适合您的需求！

一种可能的解决方案是使用以下代码段.

You can tweak the solution to make to suit your needs!

One possible solution is using the following snippet.

public static class ListExtensions
   {
       /// <summary>
       /// Add
       /// </summary>
       /// <typeparam name="T"></typeparam>
       /// <param name="List"></param>
       /// <param name="item"></param>
       /// <returns></returns>
       public static bool Add<T>(this List<T> List, T item)
       {
           bool isAdded = false;

           // if this is not a duplicate item
           if (!List.Contains(item))
           {
               // Add this item in the list
               List.Add(item);
               isAdded = true;
           }
           return isAdded;
       }

       /// <summary>
       /// ToStringEx
       /// </summary>
       /// <param name="StringArray"></param>
       /// <returns></returns>
       public static string ToStringEx(this string[] StringArray)
       {
           StringBuilder stringBuilder = new StringBuilder();
           foreach (string stringItem in StringArray)
           {
               stringBuilder.AppendFormat("{0},", stringItem);
           }
           return stringBuilder != null ? stringBuilder.ToString().TrimEnd (new char[] {','}) : string.Empty;
       }
   }

   public class Program
   {
       static void Main()
       {
           List<string> stringList = null;
           string longString = null;
           string[] stringArray = null;
           try
           {
               stringList = new List<string>();
               longString = "BOOK,COOK,BOOK,COOK,BOOK,LOOK,COOK,COOK,BOOK";
               stringArray = longString.Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);

               // Enumerate over the stringArray
               foreach (string stringItem in stringArray)
               {
                   // Add this item in the list
                   stringList.Add<string>(stringItem);
               }

               // Converting List<string> to string[]
               stringArray = stringList.ToArray();

               // Converting string[] to comma delimited string
               longString = stringArray.ToStringEx();
           }
           catch (Exception ex)
           {
               Console.WriteLine(ex.StackTrace);
           }
           Console.ReadKey();
       }

或者，您可以通过扩展方法指定代码并使用内联-

Or you can stip the code from the extension methods and use inline -

static void Main()
       {
           List<string> stringList = null;
           string longString = null;
           string[] stringArray = null;
           StringBuilder stringBuilder = null;
           try
           {
               stringList = new List<string>();
               longString = "BOOK,COOK,BOOK,COOK,BOOK,LOOK,COOK,COOK,BOOK";
               stringArray = longString.Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);
               // Enumarate over the stringArray
               foreach (string stringItem in stringArray)
               {
                   // if this is not a duplicate item
                   if (!stringList.Contains(stringItem))
                   {
                       // Add this item in the list
                       stringList.Add(stringItem);
                   }
               }
               // Converting List<string> to string[]
               stringArray = stringList.ToArray();
               // Converting string[] to comma delimited string
               stringBuilder = new StringBuilder();
               foreach (string stringItem in stringArray)
               {
                   stringBuilder.AppendFormat("{0},", stringItem);
               }
               longString = stringBuilder.ToString();
           }
           catch (Exception ex)
           {
               Console.WriteLine(ex.StackTrace);
           }
           Console.ReadKey();
       }

问候，
ErSehmi

Regards,
ErSehmi

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