C# find duplicates in list of strings

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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. 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 …

Find Duplicates in a List in C# Delft Stack

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. WebAs 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. bt3 usb bootable

c# - Find duplicate content in string? - Stack Overflow

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: WebFeb 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 ... 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. exedy online

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

Find Duplicates in a List in C# Delft Stack

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. 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 … exedy master cylinderWebMar 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, … bt 4000 trio

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

C# find duplicates in list of strings

How to Find Duplicates in a String in C - Dot Net Tutorials

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. 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

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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 … 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 …

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 (); … 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.

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 … 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.

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.

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 exedy indonesiaWebApr 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); } exedy manufacturing indonesiaWebExample: c# find duplicates in list of strings var list = new List(); list.GroupBy(n => n).Any(c => c.Count() > 1); bt 4000 phone reviewWebNov 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. bt 4000 phone with answer machine exedy oem flywheelWebOct 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. exedy oem clutchWebMay 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; } bt 4000 cordless phones