What is the Efficiency and Performance of LINQ and Lambda Expression in .Net? An interesting question, but Linq is about querying and what you're doing here doesn't look much like a query to me. Generic Doubly-Linked-Lists C implementation. 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. Here I have a simple example to find an item in a list of strings. For Starship, using B9 and later, how will separation work if the Hydrualic Power Units are no longer needed for the TVC System? Why did US v. Assange skip the court of appeal? Even by limiting it like this, it still takes around 3 min. Please read, Updating items of one List that match another List, How a top-ranked engineering school reimagined CS curriculum (Ep. rev2023.5.1.43405. How would you do a "not in" query with LINQ? c# - Set list property value using LINQ ForEach - Stack Overflow Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. Why did DOS-based Windows require HIMEM.SYS to boot? What is the difference between Python's list methods append and extend? I'm querying to return every element of a List, so I can then set those values. Any suggestion? Where does the version of Hamapil that is different from the Gemara come from? it will be discarded but, how will you replace older list values? I'm using VS 2008. You can create a extension method: public static IEnumerable Do(this IEnumerable self, Action action) { If you need to add any IEnumerable collection of elements to the list you need to use AddRange. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? All values are updated in one line of code and you browse the List only ONE time. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. FYI, I know that DateTime defaults to MinValue, in reality this is clearing the arrays to default after they've already been set. 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. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? Query a collection of objects (LINQ in C#) | Microsoft Learn Is "I didn't think it was serious" usually a good defence against "duty to rescue"? This appears to be a response to another answer rather than an answer to the question. Even if there is a solution out there, I'm not sure I'd use Linq for something like this. In my application I have a list of items I need to sort by price and set a rank/position index for each item. 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. Does a password policy with a restriction of repeated characters increase security? See below for arguments against it. Connect and share knowledge within a single location that is structured and easy to search. Find centralized, trusted content and collaborate around the technologies you use most. You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. If you want to avoid this anonymous type here is the 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( Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Canadian of Polish descent travel to Poland with Canadian passport. The ToList is making a list, populating it, and the immediately discarding it. Can my creature spell be countered if I cast a split second spell after it? 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. c# - how to query LIST using linq - Stack Overflow It's not LINQ, and it's not really much different to your nested for loops, just slightly less verbose. Making statements based on opinion; back them up with references or personal experience. I don't have a C# compiler here but maybe AddRange instead of Add works: Thanks for contributing an answer to Stack Overflow! Making statements based on opinion; back them up with references or personal experience. foreach(var item in self) { I would externalize that part into a function to make it more manageable. Asking for help, clarification, or responding to other answers. Also, you For multiple. Which was the first Sci-Fi story to predict obnoxious "robo calls"? It's not them. x.Value = Convert.ToDouble(string.Format("{0:0.0}", x)) : x.Value = x.Value); This gives you an I pass a List a using ref, along with another List b. I need to cycle thru List b, which contains around 200,000 items, and for each item in b, it it matches criteria in a, which contains 100,000 or more items, and update it. How can I get the index of an item in a list in a single step? and MatchingColumnName1 and MatchingColumnName2 are properties of collections. Not the answer you're looking for? (Your question does not sound like you want to copy the original objects). C# Set field of all items in list to same value - Stack Overflow
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