Nevermind, actually you can get rid of the lambdas for a few cases Great answers! You have also a way to set a default value. How do I split a list into equally-sized chunks? 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 positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? IEnumerable vs List - What to Use? 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. FYI, I know that DateTime defaults to MinValue, in reality this is clearing the arrays to default after they've already been set. How is this any different? Not the answer you're looking for? If you want to create a new List with each element set to a value, you can do this: var changes = Enumerable.Range (0, width) .Select (x => Use LINQ to get items in one List<>, that are not in another List<>, Simple deform modifier is deforming my object. I want to do: Just change all values for a property in all elements of my collection. I suspect that this can be written shorter using LINQ over objects syntax. It doesn't work. c# - ToList method in Linq - Stack Overflow 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. Find centralized, trusted content and collaborate around the technologies you use most. Ok, this should hopefully be of some help: I would also look into PLINQ as you have a lot of data to plow through. There's no -1 index (not found) in my example. Not the answer you're looking for? Can I use my Coinbase address to receive bitcoin? Can these methods be used with other collections too like, @yellavon these are extension methods on any type that implements. 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? 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. Has the Melford Hall manuscript poem "Whoso terms love a fire" been attributed to any poetDonne, Roe, or other? 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? It's about querying, i.e. 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. Is there any known 80-bit collision attack? You really shouldn't use LINQ to perform side effects. What were the most popular text editors for MS-DOS in the 1980s? "Signpost" puzzle from Tatham's collection. Asking for help, clarification, or responding to other answers. How to set Name value as ID in List in c# using Linq? To learn more, see our tips on writing great answers. For multiple. Which method performs better: .Any() vs .Count() > 0? c# - Change value in List using Linq - Stack Overflow Find centralized, trusted content and collaborate around the technologies you use most. Which reverse polarity protection is better and why? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Can my creature spell be countered if I cast a split second spell after it? You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. Here is an example. Why are players required to record the moves in World Championship Classical games? Passing negative parameters to a wolframscript. Making statements based on opinion; back them up with references or personal experience. At the moment I am doing it like this: You could do it using the let keyword. //using linq list = Students.Where (s => s.Name == "ABC").ToList (); //traditional way foreach (var student in Students) { if (student.Name == "ABC") list.Add I'm using VS 2008. { Be aware that it only updates the first company it found with company id 1. The i.age = 10 part is not different from the item.age = 10 part. But,in my case, I must repeat the foreach in many collections, and I didn't want to repeat the loop. 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 can I control PNP and NPN transistors together from one pin? What is Wario dropping at the end of Super Mario Land 2 and why? When do you use in the accusative case? rev2023.5.1.43405. It should not be hard to analyze the complexity of this. A boy can regenerate, so demons eat him for years. Find centralized, trusted content and collaborate around the technologies you use most. When do you use in the accusative case? Does a password policy with a restriction of repeated characters increase security? I've tried using ForEach and various forms of select, etc.. nothing seems to work right. Identify blue/translucent jelly-like animal on beach. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. 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? To learn more, see our tips on writing great answers. Eric Lippert wrote a great blog post about the subject that is worth a read: "foreach" vs "ForEach". Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. To learn more, see our tips on writing great answers. Not the answer you're looking for? What positional accuracy (ie, arc seconds) is necessary to view Saturn, Uranus, beyond? Why are players required to record the moves in World Championship Classical games? Weighted sum of two random variables ranked by first order stochastic dominance. 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. rev2023.5.1.43405. Is a downhill scooter lighter than a downhill MTB with same performance? dont forget the return syntax it took me one hour, Very neat! 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? using Linq would be: listOfCompany.Where(c=> c.id == 1).FirstOrDefault().Name = "Whatever Name"; Use a combination of query syntax and method Making statements based on opinion; back them up with references or personal experience. If you need to add any IEnumerable collection of elements to the list you need to use AddRange. Does a password policy with a restriction of repeated characters increase security? 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. That's all it does. 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. There are certainly ways to (ab)use LINQ to achieve the same results, but I'd consider them to be dirty hacks. How can I get the index of an item in a list in a single step? Also, you When to use .First and when to use .FirstOrDefault with LINQ? As sircodesalot mentioned, you can't use linq to do something like that. Note that this will throw if the item doesn't exist. foreach(var item in self) { If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? 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"? var newList = correctionQoutas.Select(x => x.Value%1 != 0 ? Not the answer you're looking for? The check if you have decimal places is unneccessary too, since the output will be a double anyway. 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? The below is practically the same as the answer provided by Florian Schmidinger: Thanks for contributing an answer to Stack Overflow! Weighted sum of two random variables ranked by first order stochastic dominance. 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. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? Thanks for contributing an answer to Stack Overflow! Use .ToList () in order to convert query in list that you can work with. Google "LINQ side effects" for more information. If it is possible, how? Canadian of Polish descent travel to Poland with Canadian passport. Can I use LINQ to find an item in the list? Connect and share knowledge within a single location that is structured and easy to search. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why refined oil is cheaper than cold press oil? Write LINQ queries in C# | Microsoft Learn Parabolic, suborbital and ballistic trajectories all follow elliptic paths. I found SingleOrDefault to be my answer of choice - same as Single but returns 'null' if it can't find it. (from c in listOfCompany where c.id == 1 select c).First ().Name = "Whatever Name"; For Multiple updates. 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; })

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