how to set value in list using linq c#

By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Be aware that it only updates the first company it found with company id 1. For multiple (from c in listOfCompany where c.id == 1 select c).First( How do I get the number of elements in a list (length of a list) in Python? Making statements based on opinion; back them up with references or personal experience. But,in my case, I must repeat the foreach in many collections, and I didn't want to repeat the loop. I have attached my sample program. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Your first example is actually the correct method. It's not them. But then, at this point, you're better off (with less typing) doing it the "clear" way: This is shorter, very clear in its intent, and very clean. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 1. create enumerables over existing collections. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why don't we use the 7805 for car phone chargers? 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. You can use Magiq, a batch operation framework for LINQ. I assume you want to change values inside a query so you could write a function for it However, one potential optimization could be realized in your foreach line as such: This would limit the set brought back to only those members that actually need their ToUpdate set rather than just setting them whether they need to or not. When to use .First and when to use .FirstOrDefault with LINQ? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. Sorry, guys. Folder's list view has different sized fonts in different folders. In general Linq is a query- not an update tool, but you can use a foreach: var currentRequests = 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. Can I use the spell Immovable Object to create a castle which floats above the clouds? It's about querying, i.e. What are the advantages of running a power tool on 240 V vs 120 V? I don't really see how this is any different. Asking for help, clarification, or responding to other answers. 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. var newList = correctionQoutas.Select(x => x.Value%1 != 0 ? Thanks for contributing an answer to Stack Overflow! Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Not the answer you're looking for? Why refined oil is cheaper than cold press oil? warning? Simple deform modifier is deforming my object. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? For multiple. var list = from something in someList select GetModifiedObject (x); // but change one property private MyType What is Wario dropping at the end of Super Mario Land 2 and why? I have another List that contains the data, this just maps each element of the string array to a time when they last changed. I'm querying to return every element of a List, so I can then set those values. Do I need to check if list is null first? 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. 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 Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Why are players required to record the moves in World Championship Classical games? Here I have a simple example to find an item in a list of strings. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.5.1.43405. When do you use in the accusative case? This will give syntax error, How to set a value in one list when comparing it with other list using LINQ, How a top-ranked engineering school reimagined CS curriculum (Ep. Identify blue/translucent jelly-like animal on beach. Short story about swapping bodies as a job; the person who hires the main character misuses his body. What were the most popular text editors for MS-DOS in the 1980s? using Linq would be: listOfCompany.Where(c=> c.id == 1).FirstOrDefault().Name = "Whatever Name"; Use LINQ to get items in one List<>, that are not in another List<>, Simple deform modifier is deforming my object. It was designed to bring native data querying to .NET. Please read, Updating items of one List that match another List, How a top-ranked engineering school reimagined CS curriculum (Ep. I disagree, it is in fact a query, but a query with side effects. How are engines numbered on Starship and Super Heavy? Connect and share knowledge within a single location that is structured and easy to search. How do I make a flat list out of a list of lists? You have also a way to set a default value. I use a simple list here. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Does a password policy with a restriction of repeated characters increase security? How can I control PNP and NPN transistors together from one pin? Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? 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. You can create a extension method: public static IEnumerable Do(this IEnumerable self, Action action) { Are there any canonical examples of the Prime Directive being broken that aren't shown on screen? What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? It only takes a minute to sign up. I mean, if PopulateChanges() is returning you a List<> of DateTime arrays, and you are going through all of them and setting them to DateTime.MinValue, what exactly is the code unit that you want to put in the delegate? Making statements based on opinion; back them up with references or personal experience. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? ), Ubuntu won't accept my choice of password. Not the answer you're looking for? Not the answer you're looking for? For Starship, using B9 and later, how will separation work if the Hydrualic Power Units are no longer needed for the TVC System? ', referring to the nuclear power plant in Ignalina, mean? Making statements based on opinion; back them up with references or personal experience. A boy can regenerate, so demons eat him for years. Whenever I wish to access my margins values, for instance, I address my dictionary: So, depending on what you're doing, a dictionary can be useful. Not the answer you're looking for? { What you could do, if you don't want to do it the first way and if your collection is a list already (but not an IEnumerable) you can use the ForEach extension method in linq to do what you're asking. Find centralized, trusted content and collaborate around the technologies you use most. It's exactly what I was looking for, How a top-ranked engineering school reimagined CS curriculum (Ep. There are many such queries used in Linq, such as projecting transofrmation, etc.. How a top-ranked engineering school reimagined CS curriculum (Ep. You can't modify a collection while you're iterating it. Simply put: what you're doing is, it will create new list which will replace old one, BTW the only LINQ here is. Identify blue/translucent jelly-like animal on beach. One possible way to do this is to use ToLookup(): Another way to do basically the same thing would be using join: Also, you should really use better variable names. Any suggestion? How do I stop the Flickering on Mode 13h? I have my doubts that my box is 18,000 times faster than yours, so something else must be at work here. (Your question does not sound like you want to copy the original objects). Why did US v. Assange skip the court of appeal? Great answer. it will be discarded but, how will you replace older list values? You need change increment to postfix (rankPosition++) or initial value of rankPosition to 0. Google "LINQ side effects" for more information. Why is it shorter than a normal address? Which reverse polarity protection is better and why? It can be done this way as well foreach (Company company in listofCompany.Where(d => d.Id = 1)).ToList()) Asking for help, clarification, or responding to other answers. 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. Connect and share knowledge within a single location that is structured and easy to search. Reme. At this point, the Select option is far uglier, more typing, etc. Is a downhill scooter lighter than a downhill MTB with same performance? Is there any known 80-bit collision attack? The i.age = 10 part is not different from the item.age = 10 part. Thanks for contributing an answer to Code Review Stack Exchange! You really shouldn't use LINQ to perform side effects. 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. Connect and share knowledge within a single location that is structured and easy to search. A new List, yes - but containing the same items, which will be updated correctly. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A), Folder's list view has different sized fonts in different folders. 20 : 30)) What is the symbol (which looks similar to an equals sign) called? What were the most popular text editors for MS-DOS in the 1980s? Can you perhaps include some description of your answer instead of just posting a blob of code? MathJax reference. The list IS updated as expected. When to use .First and when to use .FirstOrDefault with LINQ? When do you use in the accusative case?

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