2024 C# list exists any

C# list exists any

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WebThe Exists method returns false because all such elements have been removed. Note In C# and Visual Basic, it is not necessary to create the Predicate delegate ( Predicate … WebOct 21, 2024 · Exists () is just like Find on List except it returns true or false, not a new List of matches. It can make some code simpler. Find () and Exists () makes some C# code clearer. Find example. Here we consider the Find () method on List. Find accepts a Predicate, which we can specify as a lambda expression. It returns the first match. …

c# - Searching if value exists in a list of objects using Linq

WebJan 31, 2024 · I am trying to prevent adding an item in the list that already exist in C#. The code below loops through datatable rows. As you can see rows is of the type List datatables rows does contain duplicates. I need check if the rowName in the datatable is already in rows object of type List. … WebAlso seems silly to be passing lists around... private bool Exists (List lList, string sCompare) { bool bVal = false; foreach (string s in lList) { if (s == sCompare) { bVal = true; } break; } return bVal; } c# list contains exists Share Improve this question Follow asked Mar 6, 2016 at 20:15 Andy Stagg 353 5 22 technical go live and business go live

c# - LINQ query to find if items in a list are contained in another ...

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 WebOct 13, 2010 · As long as your list is initialized with values and that value actually exists in the list, then Contains should return true. I tried the following: var list = new List {1,2,3,4,5}; var intVar = 4; var exists = list.Contains (intVar); And exists is indeed set to true. Share Follow answered Oct 13, 2010 at 13:40 Rune Grimstad 35.4k 10 62 76 WebNov 1, 2016 · List list = new List (); list.Add ("One"); list.Add ("Two"); var result = query.Where (x => list.Contains (x.tags)); Share Improve this answer Follow answered May 20, 2014 at 15:40 Ehsan Sajjad 61.6k 16 105 160 2 Contains does not accept a sequences of items as it's parameter – Servy May 20, 2014 at 15:44 2 spa school newsletter

c# - Case-Insensitive List Search - Stack Overflow

List.Exists method - C# / C Sharp

WebAug 29, 2013 · The first approach uses a loop: bool isFound = false; foreach (item1 in list1) { if (list2.Contains (item1)) { isFound = true; break; } } The second one uses Linq directly: bool isFound = list1.Intersect (list2).Any (); The first one is long to write and not very straightforward/easy-to-read. WebOct 5, 2009 · If you're using .NET 3.5, it's easy: public class ListHelper { public static bool ContainsAllItems (List a, List b) { return !b.Except (a).Any (); } } This checks whether there are any elements in b which aren't in a - and then inverts the result. Note that it would be slightly more conventional to make the method generic rather than ... technical go-live vs functional go-liveWebMay 21, 2024 · The Any() method can also be used to quickly check if a collection has elements within it. var listIsNotEmpty = countries.Any(); … technical goals usability

"WebApr 2, 2013 · c# - Find items from a list which exist in another list - Stack Overflow Find items from a list which exist in another list Ask Question Asked 10 years ago Modified 2 years, 7 months ago Viewed 93k times 53 I have a List PropA { int a; int b; } and another List PropX { int a; int b; } " - C# list exists any

C# list exists any

List .Contains(T) Method (System.Collections.Generic)

WebC# public bool Contains (T item); Parameters item T The object to locate in the List. The value can be null for reference types. Returns Boolean true if item is found in the List; otherwise, false. Implements Contains (T) Examples WebYou can use the Any method with a predicate to check if a string contains any strings from a list in Entity Framework. Here's an example: csharpvar myList = new List { "foo", "bar", "baz" }; var result = db.MyTable .Where(x => myList.Any(y => x.MyField.Contains (y))) .ToList(); In this example, myList contains a list of strings that we ...

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WebOct 16, 2010 · I have a list testList that contains a bunch of strings. I would like to add a new string into the testList only if it doesn't already exist in the list. Therefore, I need to do a case-insensitive search of the list and make it efficient. I can't use Contains because that doesn't take into account the casing. I also don't want to use ToUpper/ToLower for … WebThe List class is used infrequently in F# code. Instead, Lists, which are immutable, singly-linked lists, are typically preferred. An F# List provides an ordered, immutable series of values, and is supported for use in functional-style development.

WebYou can use the Any method with a predicate to check if a string contains any strings from a list in Entity Framework. Here's an example: csharpvar myList = new List { … WebJul 1, 2009 · 9 Answers Sorted by: 558 LINQ defines an extension method that is perfect for solving this exact problem: using System.Linq; ... bool has = list.Any (cus => cus.FirstName == "John"); make sure you reference System.Core.dll, that's where LINQ lives. Share Improve this answer Follow edited Nov 25, 2012 at 18:22 answered Jul 1, 2009 at 19:59

WebFeb 7, 2007 · I have a list of integers and simply want to check if a number exists in that list. In the manual I found the List.Exists method but this apparently only works for … WebJul 14, 2011 · Jul 14, 2011 at 16:03 2 Well in LINQ to Entities, Exists () is not often not even available (on ObjectSet<>, IQueryable<>, etc.) Your only choice is Any (). Exists () will only be available if you first use ToList () in your LINQ queries. – Ross Jul 14, 2011 at 16:07 Add a comment 1 Answer Sorted by: 4

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The following code example demonstrates how to use Any to determine whether a sequence contains any elements. C# List numbers = new List { 1, 2 }; bool hasElements = numbers.Any (); Console.WriteLine ("The list {0} empty.", hasElements ? "is not" : "is"); // This code produces the following … See more spas christchurch dorsetWebFeb 14, 2014 · 3 Answers Sorted by: 12 if (list.Any ()) { // found something! } else { // found nothing } I always use Any () simply because it's the most performant. List.Count () goes through each item and counts them, but you don't care about the number of items -- you only care if there's an item at all. technical grade phosphoric acid technical graphing namingWebNov 14, 2016 · List msgList = new List (); msgList.Add ("This sentence contains the word Apple."); msgList.Add ("This doesn't contain any fruits."); msgList.Add ("This does. It's a banana."); Now I want to find out which items in msgList contains a fruit. For which, I use the following code: spas clearwater flWebExists. We examine the Exists method on List. Exists returns whether a List element is present. We invoke this method with a lambda expression. Exists call 1: The code tests first to see if any element in the List exists … spas christchurchWebJun 22, 2024 · How to check if an item exists in a C# list collection? Csharp Programming Server Side Programming Set a list − List < string > list1 = new List < … technical graphics for junior certWebSep 12, 2013 · LINQ provides you with capabilities to "query" any collection of data. You can use syntax like a database query (select, where, etc) on a collection (here the collection (list) of strings). so you are doing like "get me items from the list Where it satisfies a given condition" inside the Where you are using a "lambda expression" spas city sd in rapid