C# find duplicates in list of strings

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August undefined, 2024

WebSep 28, 2010 · List duplicates = lst.GroupBy (x => x) .Where (g => g.Count () > 1) .Select (g => g.Key) .ToList (); The GroupBy groups the elements that are the same together, and the Where filters out those that only appear once, leaving you with only the duplicates. Share Improve this answer Follow answered Sep 28, 2010 at 9:42 Mark Byers WebApr 8, 2016 · string text = "elements"; var duplicates = new HashSet (); var duplicateCounts = new Dictionary (); foreach (char c in text) { int charCount = 0; bool isDuplicate = duplicateCounts.TryGetValue (c, out charCount); duplicateCounts [c] = ++charCount; if (isDuplicate) duplicates.Add (c); }

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WebThere are 4 different kinds of duplicates. If you wanted to get the total amount of dupe items no matter what the dupes are, then use this. var totalDupes = letters.GroupBy (x => x).Where (grp => grp.Count () > 1).Sum (grp => grp.Count ()); So the variable totalDupes would be 10. This is the total duplicate items of each dupe type added together. WebUse Enumerable.Intersect method List duplicates = list1.Intersect (list2).ToList (); Share Follow answered Jan 15, 2014 at 21:07 Sachin 39.9k 7 89 102 And then to finish it off, call ToList (). The original poster specifies that the desired result is a third list. – Eric Lippert Jan 15, 2014 at 21:09 Thank you! This is exactly what i need. ez spc 2.0 매뉴얼

c# - How to find duplicate items in list<>? - Stack Overflow

WebAlso, I want to mark each object that contains a duplicate string as having a duplicate string (with a bool HasDuplicate on the object). So when the duplication detection has run I want to simply foreach over the list like so: ... LINQPad is a great tool for figuring out problems like this - every C# developer should have a copy. – Winston Smith. WebI have a list of items. John ID; Matt ID; John ID; Scott ID; Matt ID; John ID; Lucas ID; I want to shove them back into a list like so which also means I want to sort by the highest number of duplicates. John ID 3; Matt ID 2; Scott ID 1; Lucas ID 1; Let me know how I can do this with LINQ and C#. Thanks All. EDIT 2 Showing Code: Webvar duplicates = list.GroupBy (a => a).SelectMany (ab => ab.Skip (1).Take (1)).ToList (); It will be more efficient then the one using Where (g => g.Count () > 1) and will return only … hilang deria bau in english

How to find the duplicates in the given string in c#

String to Custom DateTime Format Parse C# [duplicate]

WebMay 18, 2011 · Here is the corresponding C# code: public static string FindDuplicateSubstring (string s) { for (int len = s.Length-1; len > 0; len--) { var dict = new Dictionary (); for (int i = 0; i <= s.Length - len; i++) { string sub = s.Substring (i, len); if (dict.ContainsKey (sub)) return sub; else dict [sub] = i; } } return null; } WebFeb 13, 2024 · 2 Answers Sorted by: 2 You need to break down the problem, You can use Dictionary to store the result. Step 1: Read the file. You can use File.ReadLines for it. Step 2 : Iterate over the lines, except the first time, and split them based on separator, which your case is whitespace ez sphereWebAug 9, 2024 · Use Enumerable.GroupBy () to Find Duplicates in a List in C# We can use the Enumerable.GroupBy () function to group the elements according to each element’s … ez speedy fence

"WebApr 11, 2024 · You can try something like this to see if a list of string has duplicates. public static bool ListHasDuplicates (List lst) { bool result = false; var distinctList = lst.Distinct ().ToList (); result = (lst.Count () == distinctList.Count ()); return !result; } Please sign in to rate this answer. 1 person found this answer helpful. " - C# find duplicates in list of strings

C# find duplicates in list of strings

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WebJul 14, 2024 · List originalList = new List (); List duplicateItems = new List (); // pathList is a simple List that contains my paths. foreach (string item in pathList) { // Do some stuff here and pick 'item' only if it fits some criteria. if (IsValid (item)) { originalList.Add (item); int occurences = originalList.Where (x => x.Equals (item)).Count (); … WebNov 28, 2024 · Another way of doing the count of the duplicates items in a C# can be as follow:- var duplicates = from d in list group d by d into c let count = c.Count () orderby count descending select new { Value = c.Key, Count = count }; foreach (var v in duplicates) { string strValue = v.Value; int Count = v.Count; } Share Improve this answer

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Web2 days ago · I was wondering if there is a method in order to remove duplicate from claims. this is my extract code: var identity = new ClaimsIdentity (JwtBearerDefaults.AuthenticationScheme); foreach (Delegation d in delegations) { List delegateRoles = await (from r in _dbContext.Roles where (del.DelegatedId … Web2 days ago · You should ParseExact string into date using existing format: string startTime = "10/22/2012 9:13:15 PM"; DateTime date = DateTime.ParseExact ( startTime, "M/d/yyyy h:m:s tt", // <- given format CultureInfo.InvariantCulture, DateTimeStyles.None); And only then format the date while using desired format:

WebAug 9, 2024 · Use Enumerable.GroupBy () to Find Duplicates in a List in C# We can use the Enumerable.GroupBy () function to group the elements according to each element’s value. Then, a filter removes the groups that only exist once, leaving the remaining groups with duplicate keys.

WebFind duplicates in a List in C#. This post will discuss how to find duplicates in a list in C#. 1. Using Enumerable.GroupBy () method. We can use the Enumerable.GroupBy () method to group the elements based on their value, then filters out the groups that appear only once, leaving them out with duplicates keys. The above code can be shortened ... WebOct 23, 2015 · I am trying to find duplicates in a list of strings of path names to the server: My paths will look like \\UTIR\STORAGE\10-23-2015\DEPOSITS\123_DEPOSIT_10-23-2015_1.pdf I will have have to 50 of these that I need to check the end of the path \123_DEPOSIT_10-23-2015_1.pdf to make sure there are no duplicates.

WebJun 27, 2011 · static List FindAndRemoveDuplicates (Dictionary> data) { // find duplicates var dupes = new HashSet ( from list1 in data.Values from list2 in data.Values where list1 != list2 from item in list1.Intersect (list2) select item); // remove dupes from lists in the dictionary foreach (var list in data.Values) list.RemoveAll (str => dupes.Contains …

WebApr 10, 2024 · The loop should iterate and for each item if it has secondary options string, based on string we will get list of items which we need to assign against that particular iteration Child. (i.e) A-has children aa,ab,ac. aa has children aaa, aab. aaa, aab should be mapped to aa.Children and aa,ab,ac should be mapped to A.Children. hilang deria bau dan rasaWebJan 23, 2024 · c# find duplicates in list of strings. var query = lst.GroupBy ( x => x) .Where ( g => g.Count () > 1 ) .Select ( y => y.Key) .ToList (); var list = new List< string > (); … hilang deria bau in medical termWebNov 1, 2024 · A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. ezsphere 4810-900WebMar 22, 2016 · You might find duplicate keys if you use number of occurrences as a Key to Dictionary I would suggest use Dictionary where key represents the string and value represents no of occurrences. Now we can use Linq statements. var results = items.SelectMany (item=>item) .GroupBy (item=>item) .ToDictionary (g=>g.Key, … hilang deria rasaWebAs ed replied in the comment you can use the TextFieldParser class by passing the string in the constructor. Another way would be to use regular expressions to solve it. hilang di cadas pangeranWebJul 1, 2014 · The count of the groups is the number of duplicate groups, and the count of each group internally is the number of duplicates of that single item. Additional note, the .Skip(1).Any() is there because a .Count() in the Where clause would need to iterate every single item just to find out that there is more than one. hilang di bukit krapyakWebNov 14, 2024 · c# find duplicates in list of strings Hahn var list = new List (); list.GroupBy (n => n).Any (c => c.Count () > 1); View another examples Add Own solution Log in, to leave a comment 4.1 10 Jafer Zuber Mohammed 120 points var list = new List (); // Fill the list if (list.Count != list.Distinct ().Count ()) { // Duplicates exist } hilang di mata di hati jangan