C# list find element by property

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WebJul 1, 2009 · One option for the follow on question (how to find a customer who might have any number of first names): List names = new List { "John", "Max", "Pete" }; bool has = customers.Any (cus => names.Contains (cus.FirstName)); or to retrieve the customer from csv of similar list. WebJan 4, 2024 · C# List Find. last modified January 4, 2024. In this article we show how to find elements in C# with Find, FindLast, FindAll, FindIndex, and FindLastIndex methods. C# list is a collection of elements of the same type. …

c# - Checking if a list of objects contains a property with a …

WebMar 2, 2015 · /// /// Get the minimum element, based on some property, like a distance or a price. /// static public T MinElement (this IEnumerable list, System.Func selector) { T ret = default (T); float minValue = float.MaxValue; foreach (T elem in list) { float value = selector (elem); if (value <= minValue) { ret = elem; minValue = value; } } return ret; } … WebSearches for an element that matches the conditions defined by a specified predicate, and returns the zero-based index of the first occurrence within the List or a portion of it. This method returns -1 if an item that matches the conditions is not found. Overloads FindIndex (Int32, Int32, Predicate) sleep apnea and cpap

C# How to get all elements of a List that match the conditions ...

WebJun 11, 2024 · If you want the index of the element, this will do it: int index = list.Select ( (item, i) => new { Item = item, Index = i }) .First (x => x.Item == search).Index; // or var tagged = list.Select ( (item, i) => new { Item = item, Index = i }); int index = (from pair in tagged where pair.Item == search select pair.Index).First (); WebOct 21, 2024 · The parameter to the Find method is a lambda expression: a Predicate instance. using System; using System.Collections.Generic; class Program { static void Main () { List list = new List (new int [] { 19, 23, 29 }); // Finds first element greater than 20. int result = list. Find (item => item > 20); Console.WriteLine (result); } } 23 WebApr 27, 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. sleep apnea and co2 retention

Searching if value exists in a list of objects using Linq

c# - How to get/find an object by property value in a list

WebAug 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 from the arrays. A list can be resized dynamically but arrays cannot. List class can accept null as a valid value for reference types and it also allows duplicate elements. WebNov 13, 2013 · LinkedListNode element = myObject.First; while (element != myObject.Last) { if (element.Value.ID == myID) break; element = element.Next; } But I'm wondering if there is a more elegant solution. Note that I need LinkedListNode as a result in order to navigate the list from there. c# linq generics Share Improve this … sleep apnea and chronic sinusitisWebApr 2, 2013 · 53 I have a List PropA { int a; int b; } and another List PropX { int a; int b; } Now i have to find items from List which exist in List matching b property using lambda or LINQ. c# linq collections lambda Share Improve this question Follow edited Apr 2, 2013 at 16:46 Michael Myers ♦ 188k 45 291 292 sleep apnea and disability act

"WebMar 24, 2014 · 1. Iterate through List 2. Get property value from that element with a string named to that property For example: I want to know the ID of the person in a list: I can do this: foreach (Person p in persons) { String personId = p.ID; } But I want to do something like this: foreach (Person p in persons) { String personId = p. + "ID"; } " - C# list find element by property

C# list find element by property

c# - Finding elements inside ExpandoObject - Code Review Stack …

WebOct 16, 2012 · using System.Linq; list.Where (s=>s!=null && s.StartsWith ("S")).Count (); if Linq is not available. int count=0; foreach (string s in list) { if (s!=null && s.StartsWith ("S")) count++; } Share Improve this answer Follow answered Oct 16, 2012 at 9:56 Bob Vale 17.9k 41 49 Add a comment 4 Using linq makes this simple WebJun 22, 2024 · Find a specific element in a C List - Set a list −List myList = new List() { 5, 10, 17, 19, 23, 33 };Let us say you need to find an element that is divisible by 2. For …

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WebApr 24, 2014 · var has nothing to do with dynamic. var is simply implicit typing - the actual type is inferred from the type of the assignment, and that's resolved at compile-time (you get IntelliSense and can even get the IDE to tell you what var stands for by hovering the variable with your mouse cursor). dynamic, however, is resolved at run-time. WebThis post will discuss how to find an element in the given list in C#. The solution should return true if the list contains the specified value; otherwise, false. 1. Using …

WebIn the above example, List primeNumbers = new List(); creates a list of int type. In the same way, cities and bigCities are string type list. You can then add elements in a list using the Add() method or the collection-initializer syntax.. You can also add elements of the custom classes using the collection-initializer syntax. WebDec 20, 2010 · You should probably be using the FindAll method: List results = myClassList.FindAll (x => x.item1 == "abc"); Or, if you prefer your results to be typed as IEnumerable rather than List, you can use LINQ's Where method: IEnumerable results = myClassList.Where (x => x.item1 == "abc"); Share …

WebMar 14, 2016 · 1. I would suggest using IndexOf instead of a simple equality to avoid casing problems. var myBooks = books.Where (x => x.author.IndexOf ("George R.R. … WebOct 18, 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) { return i.Property == value; }); // C# 2.0+ Both of these options return default(T) (null for …

WebThe list is completely iterated over in the first call to Max. The next call to First will perform another iteration over the list to find the element. – antiduh Nov 28, 2016 at 23:39 Show 1 more comment 37 Use MaxBy from the morelinq project: items.MaxBy (i => i.ID); Share Improve this answer Follow answered Jul 6, 2010 at 17:36 tzaman

WebMar 7, 2011 · 1. If you have a reference to the List object, use the Sort () method provided by List as follows. ClassInfoList.Sort ( (x, y) => x.BlocksCovered.CompareTo (y.BlocksCovered)); If you use the OrderBy () Linq extension method, your list will be treated as an enumerator, meaning it will be redundantly converted to a List, sorted … sleep apnea and constipationWebJul 17, 2012 · You can OrderByDescending the List on the ActivationDate Field and then take FirstOrDefault () Product.OrderByDescending (p => p.ActivationDate).FirstOrDefault (); For a more simpler version there is an extension method MaxBy Product.MaxBy (p => p.ActivationDate); Share Follow edited Jul 17, 2012 at … sleep apnea and diastolic dysfunctionWebFind an item in a generic list by specifying multiple conditions. CartItem Item = Items.Find (c => c.ProductID == ProductID); Item.Quantity = Quantity; Item.Price = Price; So the above code finds and updates with other data, but if I want to find by multiple conditions, then how do I write the code? sleep apnea and daytime sleepinessWebNov 12, 2012 · You can use GroupBy: bool allEqual = orders.GroupBy (o => o.qty).Count () == 1; or, little bit more efficient but less readable: bool allEqual = !orders.GroupBy (o => … sleep apnea and edemaWeb1 Answer Sorted by: 125 With EF or LINQ to SQL: var item = db.Items.OrderByDescending (i => i.Value).FirstOrDefault (); With LINQ to Objects I suggest to use morelinq extension MaxBy (get morelinq from nuget): var item = items.MaxBy (i => i.Value); Share Improve this answer Follow edited Dec 3, 2024 at 14:33 matao 636 3 14 22 sleep apnea and cpap treatmentWebFeb 16, 2016 · Sorted by: 4 Sounds like a simple Where query should suffice: long value = 100009; var found = ItemList.Where (item => item.Start <= value && item.End >= value); This will yield an IEnumerable containing all matching items. sleep apnea and diastolic blood pressure sleep apnea and cvd