I have a bit of code that i'd like to turn into a linq expression (preferably with lambdas) to make it easier to use as a delegate. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. 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. Making statements based on opinion; back them up with references or personal experience. 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? 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. WebYou can try LINQ. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? 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 Making statements based on opinion; back them up with references or personal experience. Find centralized, trusted content and collaborate around the technologies you use most. Does a password policy with a restriction of repeated characters increase security? This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Update all objects in a collection using LINQ, Concat all strings inside a List using LINQ, How to use LINQ to select object with minimum or maximum property value, Searching if value exists in a list of objects using Linq, All possible array initialization syntaxes, String.IsNullOrWhiteSpace in LINQ Expression. If you simply need to get the elements that are of a certain type, you can do this: That would give the subset that are MyQuota or are directly assignable to that type. Why are players required to record the moves in World Championship Classical games? How are engines numbered on Starship and Super Heavy? What were the most popular text editors for MS-DOS in the 1980s? 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. Why are players required to record the moves in World Championship Classical games? Thanks for contributing an answer to Stack Overflow! //using linq list = Students.Where (s => s.Name == "ABC").ToList (); //traditional way foreach (var student in Students) { if (student.Name == "ABC") list.Add By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You're trading one assignment for one condition, that shouldn't change much. "Signpost" puzzle from Tatham's collection. You should iterate your list, and modify your values like: foreach (var student in myList) { if (student.Name == "Tom") { student.Marks = 35; } } Or foreach (var student Why did DOS-based Windows require HIMEM.SYS to boot? Where does the version of Hamapil that is different from the Gemara come from? Connect and share knowledge within a single location that is structured and easy to search. Two MacBook Pro with same model number (A1286) but different year. 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? Making statements based on opinion; back them up with references or personal experience. When to use .First and when to use .FirstOrDefault with LINQ? What are the advantages of running a power tool on 240 V vs 120 V? Was Aristarchus the first to propose heliocentrism? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, That's great. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I didn't know either Single() or SingleOrDefault(). Why? Without digging into what your actual conversion function is doing. 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. Connect and share knowledge within a single location that is structured and easy to search. To learn more, see our tips on writing great answers. It can be done this way as well foreach (Company company in listofCompany.Where(d => d.Id = 1)).ToList()) Use method syntax. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This will help you in getting the first or default value in your Linq List search. Find centralized, trusted content and collaborate around the technologies you use most. Identify blue/translucent jelly-like animal on beach. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The list may be a class with several properties and some are used for search. I need to store the rank because the price may change Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. It was designed to bring native data querying to .NET. Let me try to look it up. Weighted sum of two random variables ranked by first order stochastic dominance. from c in listOfCompany where c.id == 1 select c => Thanks for contributing an answer to Stack Overflow! If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. LINQ is about querying, not for updating collections. Making statements based on opinion; back them up with references or personal experience. Use a combination of query syntax and method In my application I have a list of items I need to sort by price and set a rank/position index for each item. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A), Folder's list view has different sized fonts in different folders. I don't really see how this is any different. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. List When do you use in the accusative case? What should I follow, if two altimeters show different altitudes? Would My Planets Blue Sun Kill Earth-Life? What is the Efficiency and Performance of LINQ and Lambda Expression in .Net? Can you perhaps include some description of your answer instead of just posting a blob of code? 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. What is this brick with a round back and a stud on the side used for? Find centralized, trusted content and collaborate around the technologies you use most. Not the answer you're looking for? Is a downhill scooter lighter than a downhill MTB with same performance? Use LINQ to get items in one List<>, that are not in another List<>, Simple deform modifier is deforming my object. WebThis is the best I have right now: var allCountries = repository.GetCountries (); var topitem = allCountries.Single (x => x.id == 592); var finalList = new List (); finalList.Add Why did US v. Assange skip the court of appeal? To learn more, see our tips on writing great answers. Besides, the LINQ equivalent probably wouldn't be any less verbose than my example above. I disagree, it is in fact a query, but a query with side effects. Generating points along line with specifying the origin of point generation in QGIS. Avoiding it would require enumerating the collection: Again, I wouldn't recommend this. Even if there is a solution out there, I'm not sure I'd use Linq for something like this. this would be used for thing done to each date time as opposed to thing done with each date time That would be slightly different. Generic Doubly-Linked-Lists C implementation. Great answer. Is a downhill scooter lighter than a downhill MTB with same performance? Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. { IEnumerable vs List - What to Use? How can I control PNP and NPN transistors together from one pin? Why does Acts not mention the deaths of Peter and Paul? Is there any known 80-bit collision attack? When to use .First and when to use .FirstOrDefault with LINQ? If I understand you correctly you have to enumerate your nested array for several different reasons and would like to encapsulate that functionality to be reused.. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Not the answer you're looking for? First, there's no real need to use. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? What differentiates living as mere roommates from living in a marriage-like relationship? You need change increment to postfix (rankPosition++) or initial value of rankPosition to 0. 8 Answers. 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. var newList = correctionQoutas.Select(x => x.Value%1 != 0 ? Most of these methods (First, Single, Any, ) cannot be. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, There is no ForEach for IEnumerable. It's better to operate on List. How to force Unity Editor/TestRunner to run at full speed when in background? I have attached my sample program. Connect and share knowledge within a single location that is structured and easy to search. It's not them. I need to store the rank because the price may change afterward. I have my doubts that my box is 18,000 times faster than yours, so something else must be at work here. Thanks for contributing an answer to Stack Overflow! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How do I remedy "The breakpoint will not currently be hit. 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. It will, except for one small detail the numbering will start from 2. Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? I want to do: Just change all values for a property in all elements of my collection. LINQ stands for Language Integrated Query. I don't think this would help. Generic Doubly-Linked-Lists C implementation, "Signpost" puzzle from Tatham's collection, Embedded hyperlinks in a thesis or research paper. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Simply put: what you're doing is, it will create new list which will replace old one, BTW the only LINQ here is. Which method performs better: .Any() vs .Count() > 0? Making statements based on opinion; back them up with references or personal experience. When do you use in the accusative case? 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? LINQ Approach (Likely Unnecessary) If you absolutely had to use LINQ, you could use a Select () call to map each of your existing elements to updated versions : // I just want to get a taste of LINQ searching from enumeration case. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? and MatchingColumnName1 and MatchingColumnName2 are properties of collections. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. What is the difference between Python's list methods append and extend? 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. It's not LINQ, and it's not really much different to your nested for loops, just slightly less verbose. For multiple. my code gives error can you please tell how i do this. //d Use .ToList () in order to convert query in list that you can work with. Thanks for contributing an answer to Stack Overflow! I think you try to add a complete list instead of a single CheckItems instance. Not the answer you're looking for? c# - Change value in List using Linq - Stack Overflow Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Boolean algebra of the lattice of subspaces of a vector space? Asking for help, clarification, or responding to other answers. Since you want to change the properties of the elements in your enumeration, you should not be using linq or List.ForEach for that. Besides checking for it's existance with if, first. Your first example is actually the correct method. How would you do a "not in" query with LINQ? 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. If you want to modify all returned objects, you still have to use a loop to iterate over the objects. I think your code is perfectly readable and won't improve much if you force it to have lots of lambdas and such. List1 and List2 are two collections. How a top-ranked engineering school reimagined CS curriculum (Ep. How to set a value in one list when comparing it with other list is there such a thing as "right to be heard"? I think I'm not undertanding LINQ well. class - Set the list value using linq - Stack Overflow Close enough for me, I think. It's also a violation of the expectations involved with LINQ - LINQ is about querying, which suggests there shouldn't be side effects when using LINQ, and the entire purpose here is to create side effects. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). 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, Using LINQ to remove elements from a List, How to use LINQ to select object with minimum or maximum property value. If you need to add any IEnumerable collection of elements to the list you need to use AddRange. If x.Value has decimals, I want to change that value to take just the first decimal woithout rounding it. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Not the answer you're looking for? Eric Lippert wrote a great blog post about the subject that is worth a read: "foreach" vs "ForEach". Connect and share knowledge within a single location that is structured and easy to search. Are there any canonical examples of the Prime Directive being broken that aren't shown on screen? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. "Signpost" puzzle from Tatham's collection. 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 knowing the full extent of the data types behind the MatchA, MatchB and ToUpdate properties, it'll be difficult to give an answer which completely solves your performance issues. How a top-ranked engineering school reimagined CS curriculum (Ep. I am using below linq query to set value of SecKey, but I still see the old value in list studentData, below id the sample I am And the enumerable containing the objects isn't modified at all. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Nevermind, actually you can get rid of the lambdas for a few cases Great answers! Not the answer you're looking for? Which was the first Sci-Fi story to predict obnoxious "robo calls"? Why is it shorter than a normal address? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Remember that linq is a querying language, which means all you can do is query it. Short story about swapping bodies as a job; the person who hires the main character misuses his body. It only takes a minute to sign up. 20 : 30)) Why don't we use the 7805 for car phone chargers? Also, you Since you save your result to a new List anyway, you can just Select the result instead: Oh and % wont do you any good here anyway, your number would be converted to int first, if it works at all. So, if you wanted to grab only a specific property from a collection you would use that. What should I follow, if two altimeters show different altitudes? Folder's list view has different sized fonts in different folders. c# - ToList method in Linq - Stack Overflow If you want to avoid this anonymous type here is the You really shouldn't use LINQ to perform side effects. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. Use method syntax. Use a combination of query syntax and method syntax. The following examples demonstrate some simple LINQ queries by using each approach listed previously.