C# find duplicates in list of strings

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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 … 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

String to Custom DateTime Format Parse C# [duplicate]

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. 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: lindy\\u0027s restaurant cumberland md

Find Duplicates in a List in C# Delft Stack

WebApr 30, 2015 · You can create an object from each item containing it's index, then group on the value and filter out the groups containing more than one object. Now you have a grouping list with objects containing the text and their original index: var duplicates = data .Select ( (t,i) => new { Index = i, Text = t }) .GroupBy (g => g.Text) .Where (g => g ... 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); } 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 lindy\u0027s restaurant cumberland md menu

c# - LINQ query to detect duplicate properties in a list of objects ...

c# find duplicates in list of strings Code Example

WebMay 4, 2024 · puts the bound to the array size. The key observation is that given a helper array h of the same size as f, any element of f, say i, can be sent into the i th slot of h. If the slot is already occupied by i, we have a duplicate. In pseudocode. int h [f.length] {0} for item in f: if h [i] == i: return i h [i] = i. 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 ... lindy\\u0027s restaurant new castle paWebNov 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 lindy\u0027s restaurant cassopolis michigan

"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. " - C# find duplicates in list of strings

C# find duplicates in list of strings

c# - How to Count Duplicates in List with LINQ - Stack Overflow

WebExample: c# find duplicates in list of strings var list = new List(); list.GroupBy(n => n).Any(c => c.Count() > 1); WebMethod1: Finding Duplicates in a String by Comparing with other letters. So let us start with the 1st method comparing with other elements. Let’s scan the list from the left-hand …

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WebNov 16, 2024 · SortedSet: a sorted collection without duplicates. To sort those items, we have two approaches. You can simply sort the collection once you’ve finished adding items: Or, even better, use the right data structure: a SortedSet. Both results print Bari,Naples,Rome,Turin. WebMar 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, …

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. WebJan 23, 2024 · c# find duplicates in list of strings Martin Frodl Code: C# 2024-01-23 17:12:47 var query = lst.GroupBy ( x => x) .Where ( g => g.Count () > 1 ) .Select ( y => y.Key) .ToList (); 0 米凯乐 Code: C# 2024-01-23 17:14:27 var list = new List< string > (); list.GroupBy ( n => n).Any ( c => c.Count () > 1 ); 0 Mark Tarvotsky Code: C# 2024-03 …

WebJul 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. WebNov 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.

WebNov 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 }

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. hotpoint hfc 3c26 wc b uk dishwasherWebAug 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 … hotpoint hfc3c26wcbuk blackWebAlso, 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. lindy\u0027s restaurant wauconda ilWebFeb 14, 2014 · foundHelloWorld = searchInList .Select ( (v,i)=>new {Index = i, Value = v}) .Where (x=>x.Value == "Hello World") .Select (x=>x.Index) .ToList (); The above code takes the list and transforms the string into a simple anonymous type incorporating each item's place in the original list. Then, it filters down to only matching elements, and then it ... hotpoint hfc3c26wcbuk dishwasher lindy\u0027s restaurant rhode islandWebAs 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. hotpoint hfc 3c26 w c manualWebMay 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; } lindy\u0027s rhode island