I need to store the rank because the price may change What were the most popular text editors for MS-DOS in the 1980s? //using linq list = Students.Where (s => s.Name == "ABC").ToList (); //traditional way foreach (var student in Students) { if (student.Name == "ABC") list.Add "Signpost" puzzle from Tatham's collection. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, how to add more than one result to the list using a linq query, Concat all strings inside a List using LINQ, Using LINQ to remove elements from a List. Why don't we use the 7805 for car phone chargers? The best answers are voted up and rise to the top, Not the answer you're looking for? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. foreach(var item in self) { Close enough for me, I think. Find centralized, trusted content and collaborate around the technologies you use most. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Sometimes when modifying properties in a foreach loop, the changes do not remain. Note that this will throw if the item doesn't exist. Asking for help, clarification, or responding to other answers. How do I stop the Flickering on Mode 13h? See below for arguments against it. How do I get the number of elements in a list (length of a list) in Python? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Asking for help, clarification, or responding to other answers. Besides checking for it's existance with if, first. Extract values from HttpContext.User.Claims, Ultrawingrid - Select row based on unique value, Concat all strings inside a List using LINQ, Using LINQ to remove elements from a List. Can my creature spell be countered if I cast a split second spell after it? Extracting arguments from a list of function calls. What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? You could make it O ( n + m) (assuming only a small number of items from a match each item in b) by using a hash table. Making statements based on opinion; back them up with references or personal experience. Identify blue/translucent jelly-like animal on beach. Why refined oil is cheaper than cold press oil? int index = mylist.FindIndex (p => p.id == 1); if (index<0) { mylist.Add (car3); } else { mylist [index] = car3; } This just uses the existing FindIndex to To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Be aware that it only updates the first company it found with company id 1. 1. 20 : 30)) Thanks. 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. Not the answer you're looking for? LINQ is about querying, not for updating collections. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. If you want the index of the element, this will do it: You can't get rid of the lambda in the first pass. Why are players required to record the moves in World Championship Classical games? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. There are several different ways to accomplish but here is one using linq and one with out this would allow you to reuse this and do different things to each item. Use method syntax. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Use .ToList () in order to convert query in list that you can work with. Normally I use a for loop or anonymous delegate to do it like this: LINQ is new for me. To learn more, see our tips on writing great answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Reme. If we had a video livestream of a clock being sent to Mars, what would we see? WebIf you really want to use linq, you can do something like this li= (from tl in li select new Myclass { name = tl.name, age = (tl.name == "di" ? Why refined oil is cheaper than cold press oil? Ok, this should hopefully be of some help: I would also look into PLINQ as you have a lot of data to plow through. I have my doubts that my box is 18,000 times faster than yours, so something else must be at work here. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? It can be done this way as well foreach (Company company in listofCompany.Where(d => d.Id = 1)).ToList()) I have attached my sample program. You have also a way to set a default value. It only takes a minute to sign up. Generic Doubly-Linked-Lists C implementation. I've tried using ForEach and various forms of select, etc.. nothing seems to work right. I think your code is perfectly readable and won't improve much if you force it to have lots of lambdas and such. Connect and share knowledge within a single location that is structured and easy to search. I think I'm not undertanding LINQ well. For multiple. Please read, Updating items of one List that match another List, How a top-ranked engineering school reimagined CS curriculum (Ep. Connect and share knowledge within a single location that is structured and easy to search. So, finally, I have found an 'inermediate' solution, the 'foreach' method, just similar to the 'Select': Anyway may be it's not as clear as the more simple: First off, this is not a good idea. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. If you want to create a new List with each element set to a value, you can do this: If you really want to do it using ForEach/LINQ, it's possible to abuse Select (but I don't recommend it): Can you describe some use cases of how you propose to use the said delegate? Generating points along line with specifying the origin of point generation in QGIS. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? When changes are cleared, I need to reset the times to MinValue. Thanks for contributing an answer to Code Review Stack Exchange! Simple deform modifier is deforming my object. I'm using VS 2008. Has the Melford Hall manuscript poem "Whoso terms love a fire" been attributed to any poetDonne, Roe, or other? { Now, the only reason I added count was so that once 10000 items in a have been updated, the loop will stop, otherwise it will take a very long time to go thru all of the items. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, There is no ForEach for IEnumerable. There are a few ways (note that this is not a complete list). Should I re-do this cinched PEX connection? 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Not the answer you're looking for? While you can use a ForEach extension method, if you want to use just the framework you can do collection.Select (c => {c.PropertyToSet = value; return rev2023.5.1.43405. Asking for help, clarification, or responding to other answers. This search will find the first or default value, which it will return. it will be discarded but, how will you replace older list values? Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. To use a linq statement to get a new List of CorrectionQuota you would do something like this: Transform the results into what you want first and then make the new List. Asking for help, clarification, or responding to other answers. Here is one way to rewrite your method to use LINQ: You can use FirstOfDefault with the Where LINQ extension to get a MessageAction class from the IEnumerable. Was Aristarchus the first to propose heliocentrism? "Signpost" puzzle from Tatham's collection. C# void QueryHighScores(int exam, int score) { var highScores = from student in students where student.ExamScores [exam] > score select new { Name Short story about swapping bodies as a job; the person who hires the main character misuses his body. Find centralized, trusted content and collaborate around the technologies you use most. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. If you need to transform the elements, then you need to use the Select() LinQ function: This gives you an IEnumerable, to freeze the contents and actually do the evaluation, you can use the ToList() function after the Select() function. I think using Join then looping through the list would be more efficient. from c in listOfCompany where c.id == 1 select c => For the sake of the example, T in this case is an object similar to the following: Is there a way I can make this more efficient? Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). Besides, the LINQ equivalent probably wouldn't be any less verbose than my example above. Set list property value using LINQ ForEach. Find centralized, trusted content and collaborate around the technologies you use most. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Single will return a single result, but will throw an exception if it finds none or more than one (which may or may not be what you want): Note that SingleOrDefault() will behave the same, except it will return null for reference types, or the default value for value types, instead of throwing an exception. Connect and share knowledge within a single location that is structured and easy to search. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, How to overcome foreach loop for list object dynamically. Would My Planets Blue Sun Kill Earth-Life? Asking for help, clarification, or responding to other answers. How can I control PNP and NPN transistors together from one pin? Enumerable.Empty()) instead of list. Use a combination of query syntax and method Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Weighted sum of two random variables ranked by first order stochastic dominance. Update all objects in a collection using LINQ, LINQ's Distinct() on a particular property, Deserializing JSON to .NET object using Newtonsoft (or LINQ to JSON maybe? Weighted sum of two random variables ranked by first order stochastic dominance. What is this brick with a round back and a stud on the side used for? Why did DOS-based Windows require HIMEM.SYS to boot? //d What are the advantages of running a power tool on 240 V vs 120 V? Should I re-do this cinched PEX connection? All values are updated in one line of code and you browse the List only ONE time. How to force Unity Editor/TestRunner to run at full speed when in background? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. dont forget the return syntax it took me one hour, Very neat! rev2023.5.1.43405. No symbols have been loaded for this document." Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. For multiple. I'm trying this but can't get it right: Which was the first Sci-Fi story to predict obnoxious "robo calls"? Sorry, guys. You could make it O(n + m) (assuming only a small number of items from a match each item in b) by using a hash table. ), Ubuntu won't accept my choice of password. What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? When do you use in the accusative case? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. how to check for a value in a list of decimal C#, C# Select From Json List Using Where Clause, String search function XML file with ASP.NET MVC. Also, you UPDATE This can be simplified to be listOf rev2023.5.1.43405. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You are essentially doing a join and then an update. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. ex. I have a list where i whant to change the value of a double property in that list if that property has decimals. In both cases , the update is not done with Linq :). You could try something like this (not a pure LINQ approach): Here is one way, assuming a class structure as follows: You can join the second list on matching IDs: I think using Join then looping through the list would be more efficient.
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