C# find a match in a list

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WebC# Copy Match match = Regex.Match (input, pattern, options); while (match.Success) { // Handle match here... match = match.NextMatch (); } The static Matches methods are equivalent to constructing a Regex object with the specified regular expression pattern and calling the instance method Matches. WebNov 21, 2013 · Finding all matching elements in a list c#. public class Foo { public int Id { get; set; } public Bar bar {get; set; } } public class Bar { public int Id { get; set;} } Now I …

c# - Find() vs. Where().FirstOrDefault() - Stack Overflow

WebYou can use the Find method on the generic list class. The find method takes a predicate that lets you filter/search the list for a single item. List list = // … WebDec 26, 2010 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams rms headlights

How To Find An Item In C# List - c-sharpcorner.com

WebNov 1, 2016 · In just LINQ to Objects, both should work.) To get the count, you'd need something like: var result = query.Select (x => new { x, count = x.tags.Count (tag => list.Contains (tag)) }) .Where (pair => pair.count != 0); Then each element of result is a pair of x (the item) and count (the number of matching tags). Share Improve this answer Follow WebApr 2, 2013 · What you want to do is Join the two sequences. LINQ has a Join operator that does exactly that: List first; List second; var query = from firstItem in … WebYou can use find with a Predicate as follows: list.Find (x => x.Id == IdToFind); This will return the first object in the list which meets the conditions defined by the predicate (ie in my example I am looking for an object with an ID). Share Improve this answer Follow answered Dec 21, 2010 at 2:00 Greg Sansom 20.2k 6 58 76 rmukwevho173 gmail.com

c# - Lambda expression to match a List - Stack Overflow

WebYou can use the List.Any() method and a lambda expression to find a string in a list that matches a specified condition in C#. Here's an example: ... In this example, we have a list of fruits and a search term that we want to find in the list. We use the Any() ... WebJul 3, 2011 · 4 Answers. var productsPerType = from t in products.SelectMany ( p => p.Types, (p, t) => new { Product = p, TypeId = t.Id }) group t by t.TypeId into g select new … rmn theorieWebJan 20, 2024 · Use a HashSet instead of a List, that way you can look for a string without having to loop through the list. var setOfStrings = new HashSet {"Cars", "Trucks", "Boats"}; Now you can use the Contains method to efficiently look for a match: var matchingVehicles = Vehicles.Where (v => setOfStrings.Contains (v.Name)); Share … rmw17ff

"WebJun 11, 2024 · A simple solution to find the index for any string value in the List. Here is code for a list of strings: int indexOfValue = myList.FindIndex(a => a.Contains("insert value from list")); A simple solution to find the index for any integer value in the List. Here is code for a list of integers: " - C# find a match in a list

C# find a match in a list

c# - linq where list contains any in list - Stack Overflow

WebDec 3, 2024 · You can check elements in a list or an array using a list pattern. A list pattern provides a means to apply a pattern to any element of a sequence. In addition, you can … WebDec 13, 2024 · Using linq, how can I retrieve a list of items where its list of attributes match another list? Take this simple example and pseudo code: List listofGenres = new List () { "action", "comedy" }); var movies = _db.Movies.Where (p => p.Genres.Any () in listofGenres); c# linq Share Follow edited Dec 13, 2024 at 10:41 Luke Girvin

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WebJan 20, 2024 · Use a HashSet instead of a List, that way you can look for a string without having to loop through the list. var setOfStrings = new HashSet {"Cars", … WebSep 23, 2008 · In C# 2.0 you'd write: result = mObjList.Find (delegate (int x) { return x.ID == magicNumber; }); 3.0 knows lambdas: result = mObjList.Find (x => x.ID == …

WebList test3 = test1.Where (w => !test2.Contains (w)).ToList (); The query above works on an exact match but not partial matches. I have looked at other queries but I can find a close comparison to this with Linq. Any ideas or anywhere you can point me to would be a great help. c# linq Share Improve this question Follow WebJul 4, 2014 · To explain this in simple terms, MegaList is a list of programs running, I am checking this list of running programs by matching it to the versionList, if the running …

WebMar 2, 2024 · List refFiles = new List (); refFiles.Add ("AB_DBER_ [0-9] {13,13}.txt"); refFiles.Add ("AB_EBER_ [0-9] {13,13}.txt"); refFiles.Add ("AB_FBER_ [0-9] {13,13}.txt"); I wanted to do something like: foreach (var file in refFiles ) { //if file has a match in files then I need to do some code } WebJan 18, 2024 · C# allows pattern matching through three constructs: 1. is operator Before C# 7.0, the only purpose of the is operator was to check if an object is compatible with a specific type. Since C# 7.0, the is operator has been extended to test if an expression matches a pattern. Syntax: expression is pattern 2. switch statements

WebJan 14, 2014 · var lookfor = @"something (with) multiple (pattern) (groups)"; var found = Regex.Matches (source, lookfor, regexoptions); var captured = found // linq-ify into list .Cast () // flatten to single list .SelectMany (o => // linq-ify o.Groups.Cast () // don't need the pattern .Skip (1) // select what you wanted .Select (c => c.Value)); … rmit check resultsWebJul 4, 2014 · 2. This basically gets every record in the MegaList which is also contained within the versionList. In this case x is an value in your MegaList, therefore we do a simple List<>.Contains () on the versionList with the x value. foreach (var m in MegaList.Where (x => versionList.Contains (x.ToLower ()))) { // do some action } rms titanic meets azur lane fanfictionWebJun 6, 2013 · private List findDegreesLoop () { var list1 = new List (); var list2 = new List (); var list3 = new List (); foreach (var degree in list2) { var matches = list1.Where (q => … rmtwebhqt01/qdepositmonitorWebOct 19, 2016 · list.Where (i => i.Property == value).FirstOrDefault (); // C# 3.0+ Using List.Find: list.Find (i => i.Property == value); // C# 3.0+ list.Find (delegate (Item i) { … rmr sight in targetsWebin addition to Anthony answer Where () visit through all records and then return result (s) while Find () dont need to traverse through all records if predicate match with given predicate. so say you have List of Test class having id and name properties. rmt tongueWebAdd a comment 3 Answers Sorted by: 23 The simplest way is to search each string individually: bool exists = s1.Any (s => s.Contains (s2)); The List.Contains () … rmscls2WebAug 30, 2024 · List.FindAll (Predicate) Method is used to get all the elements that match the conditions defined by the specified predicate. Properties of List: It is different … rms queen mary haunting