2024 C# list find element by property

C# list find element by property

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August undefined, 2024

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"; } WebMar 1, 2024 · 1. You could run the foreach query by the desired keys only: foreach ( var item in dataList.Where ( i => i.Key == "name" ) ) { //use name items } This uses LINQ to include only the KeyValuePairs where Key is "name". You will have to add using System.Linq to the top of your source code file for this to work properly.

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

WebMar 3, 2024 · 143. You can use the Enumerable.Where extension method: var matches = myList.Where (p => p.Name == nameToExtract); Returns an IEnumerable. Assuming you want a filtered List, simply call .ToList () on the above. By the way, if I were writing the code above today, I'd do the equality check differently, given the complexities … Web6 Answers. Sorted by: 6. You 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 = // ..; CompareDesignGroup item = list.Find (c => c.FieldId == "SomeFieldId"); item will be null if there is no matching item in the list. how to check roofing contractor license

c# - Finding Class Elements in a List of Classes - Stack Overflow

WebNov 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 => … 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. WebFeb 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. how to check room humidity

.net - Search within a list in C# - Stack Overflow

c# - Find items from a list which exist in another list - Stack Overflow

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. 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 … how to check rooting reflex in babiesWebOct 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 how to check root access in linux

"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 … " - C# list find element by property

C# list find element by property

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

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. WebSep 15, 2024 · Code language: C# (cs) This outputs the count of elements found: There are 3 movies Code language: plaintext (plaintext) Get element values Use the XElement.Value property to get the element’s value as a string. Here’s an example of getting elements named Title and then outputting their values:

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WebFind 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? 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

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. … 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)

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 … 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.

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; } …

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 how to check root certificate in windowsWebJun 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 … how to check ros version in ubuntuWebJan 3, 2024 · Using List.FindIndex () Method. This method returns the occurrence of the first element mentioned in the predicate and returns -1 if no element satisfies the condition. … how to check root password in linuxWebJun 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 (); how to check roshan numberWebJul 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 … how to check roth iraWebMar 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 … how to check roth tsp how to check root password in mysql workbench