how to set value in list using linq c#

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? > 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. I like this. 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. I didn't know either Single() or SingleOrDefault(). 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? Has the Melford Hall manuscript poem "Whoso terms love a fire" been attributed to any poetDonne, Roe, or other? I don't think this would help. 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. Not the answer you're looking for? Web3. foreach(var item in self) { I would externalize that part into a function to make it more manageable. List 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 => Can my creature spell be countered if I cast a split second spell after it? 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. It doesn't work. 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. What were the most popular text editors for MS-DOS in the 1980s? Which language's style guidelines should be used when writing code that is supposed to be called from another language? When do you use in the accusative case? Sorry, guys. 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. Making statements based on opinion; back them up with references or personal experience. You need change increment to postfix (rankPosition++) or initial value of rankPosition to 0. Does a password policy with a restriction of repeated characters increase security? Asking for help, clarification, or responding to other answers. If you need to add any IEnumerable collection of elements to the list you need to use AddRange. List1 and List2 are two collections. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Was Aristarchus the first to propose heliocentrism? rev2023.5.1.43405. Is a downhill scooter lighter than a downhill MTB with same performance? This new list is then discarded. rev2023.5.1.43405. What differentiates living as mere roommates from living in a marriage-like relationship? For multiple. Why did US v. Assange skip the court of appeal? List Manipulation in C# using Linq - Stack Overflow I have my doubts that my box is 18,000 times faster than yours, so something else must be at work here. Thanks for contributing an answer to Code Review Stack Exchange! c# - Set list property value using LINQ ForEach - Stack Overflow Your code is O(n m), where n is the length of a and m is the length of b. What is the symbol (which looks similar to an equals sign) called? var list = from something in someList select GetModifiedObject (x); // but change one property private MyType I've tried using ForEach and various forms of select, etc.. nothing seems to work right. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. Can you perhaps include some description of your answer instead of just posting a blob of code? 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. What does 'They're at four. AddRange takes an enumerable, and it will enumerate it all on its own. 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. Thanks. If it is possible, how? I'm querying to return every element of a List, so I can then set those values. If x.Value has decimals, I want to change that value to take just the first decimal woithout rounding it. rev2023.5.1.43405. I think using Join then looping through the list would be more efficient. 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? Is there any known 80-bit collision attack? x.Value = Convert.ToDouble(string.Format("{0:0.0}", x)) : x.Value = x.Value); This gives you an 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. What is the Efficiency and Performance of LINQ and Lambda Expression in .Net? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. But,in my case, I must repeat the foreach in many collections, and I didn't want to repeat the loop. One other point I should mention is that the Select method does a projection of some specific information to return to an IEnumerable. Why refined oil is cheaper than cold press oil? C# Set field of all items in list to same value - Stack Overflow Certainly, the nested for loop works, and I can certainly place it in a function (which I have already done). Embedded hyperlinks in a thesis or research paper. What is the symbol (which looks similar to an equals sign) called? Why? Can these methods be used with other collections too like, @yellavon these are extension methods on any type that implements. MathJax reference. This appears to be a response to another answer rather than an answer to the question. Nevermind, actually you can get rid of the lambdas for a few cases Great answers! Find centralized, trusted content and collaborate around the technologies you use most. It can be done this way as well foreach (Company company in listofCompany.Where(d => d.Id = 1)).ToList()) FYI, I know that DateTime defaults to MinValue, in reality this is clearing the arrays to default after they've already been set. 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. Where does the version of Hamapil that is different from the Gemara come from? 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. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). 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? What is Wario dropping at the end of Super Mario Land 2 and why? I just want to get a taste of LINQ searching from enumeration case. ', referring to the nuclear power plant in Ignalina, mean? 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 Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? Google "LINQ side effects" for more information. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. 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. 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. How a top-ranked engineering school reimagined CS curriculum (Ep. 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. There's not a single query in LINQ that modifies the queried collection (hence "query"). 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. A boy can regenerate, so demons eat him for years. create enumerables over existing collections. Without digging into what your actual conversion function is doing. Making statements based on opinion; back them up with references or personal experience. There are a few ways (note that this is not a complete list). { By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Besides, the LINQ equivalent probably wouldn't be any less verbose than my example above. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You can remove the .ToList call. It's better to operate on List. Concat all strings inside a List using LINQ, Using LINQ to remove elements from a List. 1. There are many such queries used in Linq, such as projecting transofrmation, etc.. Does a password policy with a restriction of repeated characters increase security? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, That's great. I need to store the rank because the price may change afterward. correctionQoutas is a custom object that has four properties. How would you do a "not in" query with LINQ? Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? The property value is not changed. The below is practically the same as the answer provided by Florian Schmidinger: Thanks for contributing an answer to Stack Overflow! Use LINQ to get items in one List<>, that are not in another List<>, Simple deform modifier is deforming my object. 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. c# - assign value using linq - Stack Overflow 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? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The ToList is making a list, populating it, and the immediately discarding it. That's all it does. 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. How a top-ranked engineering school reimagined CS curriculum (Ep. rev2023.5.1.43405. Not the answer you're looking for? To use a linq statement to get a new List of CorrectionQuota you would do something like this: Transform the results into what you want first and then make the new List. c# - assign value using linq - Stack Overflow Can anyone help me with a working expression? The below is practically the same as the answer provided by Florian Schmidinger: If we had a video livestream of a clock being sent to Mars, what would we see? Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. Can my creature spell be countered if I cast a split second spell after it? No symbols have been loaded for this document." The code looks like this: For the life of me, I can't seem to figure this one out. How are engines numbered on Starship and Super Heavy? For multiple. Connect and share knowledge within a single location that is structured and easy to search. Making statements based on opinion; back them up with references or personal experience. The OP since updated the question and having it makes no more sense at all since it's true 100% of the time. Which was the first Sci-Fi story to predict obnoxious "robo calls"? How to set a value in one list when comparing it with other list Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. You can't modify a collection while you're iterating it. Thanks for contributing an answer to Stack Overflow! from c in listOfCompany where c.id == 1 select c => 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? Most of these methods (First, Single, Any, ) cannot be. 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Why does Acts not mention the deaths of Peter and Paul? warning? What are the advantages of running a power tool on 240 V vs 120 V? Not the answer you're looking for? is there such a thing as "right to be heard"? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. //using linq list = Students.Where (s => s.Name == "ABC").ToList (); //traditional way foreach (var student in Students) { if (student.Name == "ABC") list.Add What are the advantages of running a power tool on 240 V vs 120 V? Why is it shorter than a normal address? The i.age = 10 part is not different from the item.age = 10 part. How is this any different? Asking for help, clarification, or responding to other answers. Be aware that it only updates the first company it found with company id 1. I'm not happy yet. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. class - Set the list value using linq - Stack Overflow It's an easy way to filter out nulls. Normally I use a for loop or anonymous delegate to do it like this: LINQ is new for me. (Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement). It's not LINQ, and it's not really much different to your nested for loops, just slightly less verbose. Use MathJax to format equations. 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. Find centralized, trusted content and collaborate around the technologies you use most. Simple deform modifier is deforming my object. Note that this will throw if the item doesn't exist. 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? Short story about swapping bodies as a job; the person who hires the main character misuses his body. Thanks for contributing an answer to Stack Overflow! Identify blue/translucent jelly-like animal on beach. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? I think your code is perfectly readable and won't improve much if you force it to have lots of lambdas and such. Even by limiting it like this, it still takes around 3 min. Great answer. I just want something more concise that can be used more easily in a delegate without creating a multi-line monster. rev2023.5.1.43405. 20 : 30)) Which method performs better: .Any() vs .Count() > 0? UPDATE This can be simplified to be listOf how to check for a value in a list of decimal C#, C# Select From Json List Using Where Clause, String search function XML file with ASP.NET MVC. How do I get the number of elements in a list (length of a list) in Python? I think you try to add a complete list instead of a single CheckItems instance. Remember that linq is a querying language, which means all you can do is query it. Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? I'm using VS 2008. Also, you // Next, when I try to add vnlist to vendlist, I get an error as I cannot add this to the list I get and error saying I have some invalid arguments. He also rips off an arm to use as a sword. Can I use my Coinbase address to receive bitcoin? I don't really see how this is any different. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. Use method syntax. Use a combination of query syntax and method syntax. The following examples demonstrate some simple LINQ queries by using each approach listed previously. 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( Canadian of Polish descent travel to Poland with Canadian passport. WebThis is the best I have right now: var allCountries = repository.GetCountries (); var topitem = allCountries.Single (x => x.id == 592); var finalList = new List (); finalList.Add Thanks for contributing an answer to Stack Overflow! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, There is no ForEach for IEnumerable. using Linq would be: listOfCompany.Where(c=> c.id == 1).FirstOrDefault().Name = "Whatever Name"; Identify blue/translucent jelly-like animal on beach. Eric Lippert wrote a great blog post about the subject that is worth a read: "foreach" vs "ForEach". Set operations (C#) | Microsoft Learn

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