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C# find index in list

WebMay 23, 2024 · finding closest value in an array. int [] array = new int [5] {5,7,8,15,20}; int TargetNumber = 13; For a target number, I want to find the closest number in an array. For example, when the target number is 13, the closest number to it in the array above is 15. WebMay 4, 2012 · public static List FindAllIndexOf (List values, List matches) { // Initialize list List index = new List (); // For each value in matches get the index and add to the list with indexes foreach (var match in matches) { // Find matches index.AddRange (values.Select ( (b, i) => Equals (b, match) ? i : -1).Where (i => i != -1).ToList ()); } return …

c# - Obtain the index of the maximum element - Stack Overflow

WebFeb 14, 2014 · var searchInList = new List (); //Populate your list string stringToLookUp= "Hello world"; var foundHelloWorldIndexes = new List (); for (int i = 0; i < searchInList.Count; i++) if (searchInList [i].Equals (stringToLookUp)) foundHelloWorldIndexes.Add (i); Share Improve this answer Follow answered Jun 28, … WebAug 29, 2024 · You didn't seem to really understand the code in the linked question, so I'll try to explain. The approach with Enumerable.Range creates a sequence of numbers from 0 (the first index of myList) to myList.Count - 1 (the last index of myList), and then you use Where to filter these indices, based on a condition.. So really, the lambda parameter kvp … natural hair shampoo for dry hair https://thriftydeliveryservice.com

[Solved] c# - How to find index of list in the list - CodeProject

WebJan 29, 2016 · List.FindAll Method (Predicate) (System.Collections.Generic); see also other System.Collections.Generic.List<>.Find* methods: List Class (System.Collections.Generic). Of course, your can also explicitly traverse all the elements in a foreach or for loop until you find what you need to. Alternatively, you can use LINQ: WebOct 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) { return i.Property == value; }); // C# 2.0+ Both of these options return default (T) ( null for reference types) if no match is found. WebBoth List.IndexOf() and List.FindIndex() methods can be used to find the index of the first occurrence of a specified item in a List in C#. However, the efficiency of these methods can differ depending on the size of the list and the complexity of the search criteria. List.IndexOf() method has a time complexity of O(n), where n is the number … maria tobon md

c# - Lambda expression for getting indexes of list items …

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C# find index in list

.net - Finding an item in a List<> using C# - Stack Overflow

WebThe IndexOf (T) method overload searches the list from the beginning, and finds the first occurrence of the string. The IndexOf (T, Int32) method overload is used to search the …

C# find index in list

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WebAug 7, 2013 · Its a List of Customers. The result set of the query is ordered by organization. I tried with FindIndex and IndexOf but getting errors for the former and -1 for the latter. WebYou can project the list items with their indexes first: var item = list.Select ( (item, index) =&gt; new { Item = item, Index = index }) .Where (pair =&gt; SomeCondition (pair.Item)) .Select (result =&gt; result.Index); Share Follow edited Jul 1, 2015 at 19:44 answered Nov 2, 2010 at 6:21 Frédéric Hamidi 256k 41 482 476 Add a comment 2

WebMy application uses a list like this: List list = new List(); Using the Add method, another instance of MyClass is added to the list.. MyClass provides, among others, the following methods:. public void SetId(String Id); public String GetId(); WebJun 12, 2024 · You can use the IndexOf () method to get the index of a given element of your List&lt;&gt;. However, note that since a linked list implies no random access, there really isn't any other way to find a specific element (and consequently its index) other than starting from the beginning and checking one element at a time. Share Improve this …

WebDec 30, 2024 · But you might consider using a dictionary instead. If the collection is big, it finds entries much faster than a list. The retrieval times in Big O notation: List is O(n), Dictionary is O(1). However, items in a dictionary are not ordered and have no index. In addition, keys must be unique. If you need ordered items, stick to the list. WebAug 11, 2010 · int index = list.IndexOf(b); where b is the thing to find, however there is an ambiguity here over the definition of equality. By default, classes will use reference …

WebJun 30, 2016 · List&lt;&gt; is a lot handier than DataTable, but if your table is huge you might be better off just using dt itself to avoid creating a near-duplicate data structure. It can index just like List&lt;&gt; after all. I say this having made the same mistake in the past and then running into huge data sets. List creation like this can be slow. :) –

WebDec 17, 2024 · Here's how to do it in one (long) line using LINQ, with just a single pass through the collection. It should work for any IEnumerable, not just lists.. int ... natural hair shampoo for colored hairWebJun 11, 2024 · If we need to find an element from the list, then we can use the Find and FindAll extensions method, but there is a slight difference between them. Here is an example. List items = new List() { 10, 9, 8, 4, 8, 7, 8 }; // It will return only one 8 as Find returns only the first occurrence of matched elements. natural hair sew in weaveWebSep 21, 2013 · The only way I know to find an index of List is. int index = listEmployee.FindIndex ( delegate (Employee findEmployee) { return findEmployee.Name.Equals (findName, StringComparison.Ordinal); }); I was wondering how to add the option to use. int indexT = listEmployee.FindIndex (r >= r.Name == findName); … natural hair sew in protective styleWeb1. Using List.IndexOf () method The recommended solution is to use the List.IndexOf () method, which returns the index of the first occurrence of the … maria tomasic artistWebJan 20, 2024 · C# List class provides methods and properties to create a list of objects (types). For example, the IndexOf method returns the first index of an item if found in the … natural hair shampoo for hair growthWebThis post will discuss how to determine the minimum and the maximum value in a list with its index in C#. 1. Using Min() and Max() Method. The standard solution to get the … maria toolan councillorWebJul 11, 2016 · List.IndexOf Method (T): This method performs a linear search; therefore, this method is an O ( n) operation, where n is Count. List.FindIndex Method (Predicate): This method performs a linear search; therefore, this method is an O ( n) operation, where n is Count. That said, the two functions would be used quite differently. maria tornberg