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. If you had a more generic collection IEnumerable, you can use Select in Linq to build a projection where property will be set as desired (original collection will be left untouched!): listOfRequestAssigned .Where (x => x.RequestedNumber == CurrentRequest) .Select (x => { x.RequestCompleted = true; return x; }) For multiple. rev2023.5.1.43405. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I used to use a Dictionary which is some sort of an indexed list which will give me exactly what I want when I want it. Thanks for contributing an answer to Stack Overflow! Is a downhill scooter lighter than a downhill MTB with same performance? 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 To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Folder's list view has different sized fonts in different folders. If you want to avoid this anonymous type here is the my code gives error can you please tell how i do this. 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 You are essentially doing a join and then an update. 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. LINQ is about querying, not for updating collections. An interesting question, but Linq is about querying and what you're doing here doesn't look much like a query to me. warning? x.Value = Convert.ToDouble(string.Format("{0:0.0}", x)) : x.Value = x.Value); This gives you an Here I have a simple example to find an item in a list of strings. If x.Value has decimals, I want to change that value to take just the first decimal woithout rounding it. Making statements based on opinion; back them up with references or personal experience. What is Wario dropping at the end of Super Mario Land 2 and why? Short story about swapping bodies as a job; the person who hires the main character misuses his body. I would externalize that part into a function to make it more manageable. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Assigning a value to a parameter of an lambda does not change the queried collection Linq expression to set all values of an array to a given value, How a top-ranked engineering school reimagined CS curriculum (Ep. c# - Select Multiple Fields from List in Linq - Stack Overflow Boolean algebra of the lattice of subspaces of a vector space? //d 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. For Starship, using B9 and later, how will separation work if the Hydrualic Power Units are no longer needed for the TVC System? First, there's no real need to use. A boy can regenerate, so demons eat him for years. What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Set list property value using LINQ ForEach. 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. (Your question does not sound like you want to copy the original objects). That's all it does. WebYou can try LINQ. Why are players required to record the moves in World Championship Classical games? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. When to use .First and when to use .FirstOrDefault with LINQ? All I am doing is creating a working example, as my FYI says.. i'm really caling just the for loop part of it (the rest is just setup) in an area that's different from this. How to set Name value as ID in List in c# using Linq? List1 and List2 are two collections. Without digging into what your actual conversion function is doing. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I have a list where i whant to change the value of a double property in that list if that property has decimals. I like this. Remember that linq is a querying language, which means all you can do is query it. Which reverse polarity protection is better and why? rev2023.5.1.43405. 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. Asking for help, clarification, or responding to other answers. c# - assign value using linq - Stack Overflow Please read, Updating items of one List that match another List, How a top-ranked engineering school reimagined CS curriculum (Ep. When to use .First and when to use .FirstOrDefault with LINQ? Concat all strings inside a List using LINQ, Using LINQ to remove elements from a List. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I think you try to add a complete list instead of a single CheckItems instance. c# - Use LINQ to move item to top of list - Stack Overflow By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Making statements based on opinion; back them up with references or personal experience. "Signpost" puzzle from Tatham's collection. In my application I have a list of items I need to sort by price and set a rank/position index for each item. 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. Double StartTime, Double EndTime, Double Value and string Id. Reme. > 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. Why refined oil is cheaper than cold press oil? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, No offense, but this seems like using Linq for the sole purpose of using linq, not because it's actually solving a problem (as a matter of fact, it's created a problem), I may be wrong, but I thought there is no, How a top-ranked engineering school reimagined CS curriculum (Ep. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What should I follow, if two altimeters show different altitudes? If you want to modify all returned objects, you still have to use a loop to iterate over the objects. from c in listOfCompany where c.id == 1 select c => ex. 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? 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( rev2023.5.1.43405. 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. EDIT: I guess what I'm really saying here is I want a concise way to set all elements of a multi-dimensional array to a given value. This will help you in getting the first or default value in your Linq List search. What is the symbol (which looks similar to an equals sign) called? Use LINQ to get items in one List<>, that are not in another List<>. Simply put: what you're doing is, it will create new list which will replace old one, BTW the only LINQ here is. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How a top-ranked engineering school reimagined CS curriculum (Ep. Not the answer you're looking for? Why did US v. Assange skip the court of appeal? This search will find the first or default value, which it will return. Generic Doubly-Linked-Lists C implementation. There are many such queries used in Linq, such as projecting transofrmation, etc.. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. 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. The code will look something like this. I found SingleOrDefault to be my answer of choice - same as Single but returns 'null' if it can't find it. ), Ubuntu won't accept my choice of password. When changes are cleared, I need to reset the times to MinValue. correctionQoutas is a custom object that has four properties. Why did US v. Assange skip the court of appeal? Thanks for contributing an answer to Stack Overflow! C# Set field of all items in list to same value - Stack Overflow 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. Your code is O(n m), where n is the length of a and m is the length of b. Ok, this should hopefully be of some help: I would also look into PLINQ as you have a lot of data to plow through. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Asking for help, clarification, or responding to other answers. //using linq list = Students.Where (s => s.Name == "ABC").ToList (); //traditional way foreach (var student in Students) { if (student.Name == "ABC") list.Add 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. What were the most popular text editors for MS-DOS in the 1980s? When to use .First and when to use .FirstOrDefault with LINQ? It should not be hard to analyze the complexity of this. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Do you want the item in the list or the actual item itself (would assume the item itself). Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Short story about swapping bodies as a job; the person who hires the main character misuses his body. If you want the index of the element, this will do it: You can't get rid of the lambda in the first pass. How can I control PNP and NPN transistors together from one pin? Also, Linq is only used here to loop over the collection, just like wudzik's answer. Connect and share knowledge within a single location that is structured and easy to search. Asking for help, clarification, or responding to other answers. Thanks. Since you haven't given any indication to what you want, here is a link to 101 LINQ samples that use all the different LINQ methods: 101 LINQ Samples. When do you use in the accusative case? You really shouldn't use LINQ to perform side effects. Note that this will throw if the item doesn't exist. AddRange takes an enumerable, and it will enumerate it all on its own. Why waste the time on it. Use .ToList () in order to convert query in list that you can work with. c# - How to update value in a List using LINQ - Stack Overflow Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To learn more, see our tips on writing great answers. (from c in listOfCompany where c.id == 1 select c).First ().Name = "Whatever Name"; For Multiple updates. If it is possible, how? How do I stop the Flickering on Mode 13h? 10 : (tl.name == "marks" ? 20 : 30)) Two points. Can you perhaps include some description of your answer instead of just posting a blob of code? Identify blue/translucent jelly-like animal on beach. 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? You can remove the .ToList call. Use MathJax to format equations. Asking for help, clarification, or responding to other answers. Find centralized, trusted content and collaborate around the technologies you use most. 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. So, if you wanted to grab only a specific property from a collection you would use that. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I think using Join then looping through the list would be more efficient. Why did US v. Assange skip the court of appeal? I need to store the rank because the price may change How do they work? Find centralized, trusted content and collaborate around the technologies you use most. 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 I disagree, it is in fact a query, but a query with side effects. Asking for help, clarification, or responding to other answers. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, That's great. Identify blue/translucent jelly-like animal on beach. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 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. Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? Is a downhill scooter lighter than a downhill MTB with same performance? What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Would My Planets Blue Sun Kill Earth-Life? If we had a video livestream of a clock being sent to Mars, what would we see? I have another List that contains the data, this just maps each element of the string array to a time when they last changed. Note that you can add a ForEach extension method which performs an action on each object, but I would still recommend avoiding that. Why refined oil is cheaper than cold press oil? 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. 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. To learn more, see our tips on writing great answers. It's not LINQ, and it's not really much different to your nested for loops, just slightly less verbose. Find centralized, trusted content and collaborate around the technologies you use most. Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? How do I split a list into equally-sized chunks? Use LINQ to get items in one List<>, that are not in another List<>, Simple deform modifier is deforming my object.
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