Query a collection of objects (LINQ in C#) | Microsoft Learn Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, There is no ForEach for IEnumerable. Update all objects in a collection using LINQ - Stack Overflow Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). I have another List that contains the data, this just maps each element of the string array to a time when they last changed. How do I stop the Flickering on Mode 13h? Ok, this should hopefully be of some help: I would also look into PLINQ as you have a lot of data to plow through. To learn more, see our tips on writing great answers. > var boys = new List {"Harry", "Ron", "Neville"}; > boys.IndexOf ("Neville") 2 > boys [2] == "Neville" True This will help you in getting the first or default value in your LINQ List search This search will find the first or default value, which it will return. Web3. How to call asynchronous method from synchronous method in C#? For multiple. In my application I have a list of items I need to sort by price and set a rank/position index for each item. ex. Does a password policy with a restriction of repeated characters increase security? What differentiates living as mere roommates from living in a marriage-like relationship? Not the answer you're looking for? The property value is not changed. List1 and List2 are two collections. Can my creature spell be countered if I cast a split second spell after it? Thanks for contributing an answer to Stack Overflow! Thanks for contributing an answer to Stack Overflow! What should I follow, if two altimeters show different altitudes? Should I re-do this cinched PEX connection? rev2023.5.1.43405. 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. An interesting question, but Linq is about querying and what you're doing here doesn't look much like a query to me. What does 'They're at four. Making statements based on opinion; back them up with references or personal experience. 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. How can I control PNP and NPN transistors together from one pin? The only difference between them is that the .First method will throw an exception if there is no such object in the collection when the second one returns the Making statements based on opinion; back them up with references or personal experience. Why? 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. Asking for help, clarification, or responding to other answers. Do I need to check if list is null first? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, This question is difficult/dangerous to answer without misleading people into thinking that LINQ is an appropriate solution to your problem. Connect and share knowledge within a single location that is structured and easy to search. 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? Find centralized, trusted content and collaborate around the technologies you use most. Does a password policy with a restriction of repeated characters increase security? create enumerables over existing collections. AddRange takes an enumerable, and it will enumerate it all on its own. First, there's no real need to use. 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. rev2023.5.1.43405. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. 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. 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? Simple deform modifier is deforming my object. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Embedded hyperlinks in a thesis or research paper. Which language's style guidelines should be used when writing code that is supposed to be called from another language? Thanks. The best answers are voted up and rise to the top, Not the answer you're looking for? Connect and share knowledge within a single location that is structured and easy to search. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? Not the answer you're looking for? How can I control PNP and NPN transistors together from one pin? When do you use in the accusative case? Great answer. Generic Doubly-Linked-Lists C implementation. Which reverse polarity protection is better and why? You can create a extension method: public static IEnumerable Do(this IEnumerable self, Action action) { Double StartTime, Double EndTime, Double Value and string Id. Not the answer you're looking for? Why don't we use the 7805 for car phone chargers? Identify blue/translucent jelly-like animal on beach. c# - assign value using linq - Stack Overflow It can be done this way as well foreach (Company company in listofCompany.Where(d => d.Id = 1)).ToList()) I want to compare these lists using LINQ and if IDs from both lists are equal, I want to set WorkingID in the first list, A list. Find centralized, trusted content and collaborate around the technologies you use most. c# - Add items to list from linq var - Stack Overflow To learn more, see our tips on writing great answers. true : false, Searches for the specified object and returns the index of the first occurrence within the list, Note that it returns -1 if the value doesn't occur in the list, This will help you in getting the first or default value in your LINQ List search. Why did DOS-based Windows require HIMEM.SYS to boot? Can I use LINQ to find an item in the list? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. UPDATE This can be simplified to be listOf Why are players required to record the moves in World Championship Classical games? FYI, I know that DateTime defaults to MinValue, in reality this is clearing the arrays to default after they've already been set. It's not LINQ, and it's not really much different to your nested for loops, just slightly less verbose. Should I re-do this cinched PEX connection? There's not a single query in LINQ that modifies the queried collection (hence "query"). Is a downhill scooter lighter than a downhill MTB with same performance? Folder's list view has different sized fonts in different folders. c# - conditional Updating a list using LINQ - Stack Overflow One more way to check the existence of an element in a List: You want to search an object in object list. 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. Use .ToList () in order to convert query in list that you can work with. Can you use lambda expressions and .find? 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( Why don't we use the 7805 for car phone chargers? 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. But,in my case, I must repeat the foreach in many collections, and I didn't want to repeat the loop. Ubuntu won't accept my choice of password. What were the most popular text editors for MS-DOS in the 1980s? Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? That's all it does. Write LINQ queries in C# | Microsoft Learn The below is practically the same as the answer provided by Florian Schmidinger: How to set Name value as ID in List in c# using Linq? Connect and share knowledge within a single location that is structured and easy to search. 1. To learn more, see our tips on writing great answers. Here is an example. What were the most popular text editors for MS-DOS in the 1980s? Why are players required to record the moves in World Championship Classical games? 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. I found SingleOrDefault to be my answer of choice - same as Single but returns 'null' if it can't find it. Any suggestion? And the enumerable containing the objects isn't modified at all. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? 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? Find centralized, trusted content and collaborate around the technologies you use most. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Reme. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It only takes a minute to sign up. (Your question does not sound like you want to copy the original objects). The i.age = 10 part is not different from the item.age = 10 part. Short story about swapping bodies as a job; the person who hires the main character misuses his body. This appears to be a response to another answer rather than an answer to the question. c# - ToList method in Linq - Stack Overflow 1. How do I remedy "The breakpoint will not currently be hit. 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 Avoiding it would require enumerating the collection: Again, I wouldn't recommend this. 1. I think you try to add a complete list instead of a single CheckItems instance. What are the advantages of running a power tool on 240 V vs 120 V? Normally I use a for loop or anonymous delegate to do it like this: LINQ is new for me. You really shouldn't use LINQ to perform side effects. Use method syntax. When to use .First and when to use .FirstOrDefault with LINQ? Let me try to look it up. 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. Would My Planets Blue Sun Kill Earth-Life? Use LINQ to get items in one List<>, that are not in another List<>. Not the answer you're looking for? Is there a generic term for these trajectories? If you make your expression return a value, and add something that will fully evaluate the query, such as ToList(), to the end, then it will "work", ie: That being said, ToList() has some disadvantages - mainly, it's doing a lot of extra work (to create a List) that's not needed, which adds a large cost.
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