Update one list from another list linq. where(w=> w. Use LINQ to get items in one List<>, that are in another List<> Asked 9 years, 8 months ago Modified 9 years, 8 months ago Viewed 14k times Updating One List from Another List in C# Asked 1 year, 1 month ago Modified 1 year, 1 month ago Viewed 73 times I have a List<> of custom objects. AddRange() method is the primary way to add the contents of one list to another in C#. Here is a sample of my code: EntityDB dataBase = new EntityD What is the preferable way for transferring some items (not all) from one list to another. Tolist(); Using Linq, how to check if value exist in list of objects from a list of strings? Hi I am new to the c# and Linq. This represents the most LINQ-friendly solution I can think of. They rely on code that forces execution, which is easily forgotten, as in this answer of which the writer is even aware of the right paradigm. This series of examples shows you Language Integrated Query (LINQ) techniques to use with collections and arrays. So I need to populate a list of class B instances from a list of class A instances. for example: var users = from u in context. code == RefCodes. ConvertAll () goes from a list directly into another list. But you can generate a new list and replace the old one. For now, I have something like this (and it works): List<ObjectA> – Lucifer Jul 13, 2018 at 9:09 No your question seems same to me you want to update property of one element in your list – Lucifer Jul 13, 2018 at 9:10 Possible duplicate of Linq to objects - select first object In linq query i am geting the first List as say var r1hobbyid hobbyName isactive1 cricket true2 chess truein Another linq query I am geting the result say var How do I conditionally update List<object> items using LINQ, I have managed to get a way to update all items in List<object> using this syntax: var updatedList = sourceList. I pass a List<T> a using ref, along with another List<T> b. Conclusion Using LINQ to update one list from another based on multiple conditions enhances code clarity and efficiency. Is there a LINQ query I can execute that would set the value of property1 to 100 for each entity in the list? I know I can do this via a foreach, but was wondering if LINQ could do this more elegantly. We can achieve it in several ways, with or without LINQ. What I am doing is the following: var selected = from item in items where item. However, many developers encounter confusion when trying to update values in a list using LINQ methods like `Where` and `Select`. Is it possible to set property on each element from List using LINQ. One of which is named lst and contains a full list of usernames and a second one named lstnew that contains a list of usernames who have had their val property updated. While copying to the new list, i want to assign new values also. Select () returns an IEnumerable that gets iterated into a list. I need to update values in List1 with values in List2 based on a condition that is defined When your LINQ list contains values from another list, how can you filter it? Wipfli shows you how to use the LINQ filter to simplify this process. In this article, we will discuss how to update an item in a List in C# with a simple example of each approach. Jun 13, 2019 · I wish to update values in a List when I query context from another source I can FIND the matches with 2 different styles of queries var r = from aa in context. Where(w => w. Suppose i have one list as firstlist Name 34 You cannot do this with standard LINQ operators because LINQ provides query, not update support. Users where u. So I tried writing a Linq query but I don't understand how to store that keyword in the csvData. i want to update `li` according to name but with `LINQ` like li. Jan 18, 2017 · The list of "RefCodes" contains like 30 objects. Simple, understandable, good use of LINQ and foreach (yes, it's possible to write loops with LINQ!), +1. LINQ is not meant to update objects. The problem i realized is that when one collection is IList<Material> and other is DbSet<Material> the join throws error that The type of one of the expression in the join clause is incorrect. Discover how to easily compare two lists in C# and update values conditionally while retaining the original list. Using LINQ, select list of objects inside another list of objects Asked 15 years, 4 months ago Modified 7 years, 11 months ago Viewed 114k times I have two collections: one is Items And Another is ActiveItems The only intersection between these two collection is Name I want a list with Linq from Items where the Items names are in the One of the most common ways to create a list of objects from another list in C# is by using LINQ. This method takes an enumerable collection as a parameter and appends its elements to the end of the list. I need to update values in List1 with values in List2 based on a condition that is defined In this article, we'll see how to use a list to filter other lists. Can someone please assist quickly. KeywordMatched property What I tried writing:. Normally, all we ask the Select method to do is return the object that will make up the new collection -- in fact, the Select method insists that the lambda expression passed to it return an object. Is there a way using Linq to update the counter lists fields using data from the delta while joining by Id. foreach (var I would guess it’s a more optimized execution requiring fewer iterations of list contents. LINQ (Language Integrated Query) is a powerful feature in C# that simplifies querying and manipulating collections. A practical guide with code examples using I have two object models that share some properties and a list of one type that I want to use to create a list of another type. e. I need to replace in list "Data", the fields: "code" to be with value of "new_code", and the "name" to be with value of "new_name". Discover effective methods to update a list of objects in C- using LINQ, perfect for enhancing your data handling skills!---This video is based on the questi I have a list of two properties named Kanjis : and I would like to use that to update the contents of another list named PhraseSources public class PhraseSource { [PrimaryKey] public stri asked Feb 3, 2015 at 13:08 Sid Brooklyn 1,052 5 23 51 possible duplicate of LINQ Update one list from another – BCdotWEB Feb 3, 2015 at 13:12 In my actual case, A is a class generated by Linq to Sql when I created a Linq to Sql class and added a table to it. Because class A has Linq and Linq to Sql dependancies, I do not want to expose it to my applications, so I create class B, that has no dependancies. You can use LINQ to find the object you want to update and then update it "traditionally". A practical guide with code examples using Using Linq to group a list of objects into a new grouped list of list of objects Asked 15 years, 10 months ago Modified 3 years, 6 months ago Viewed 504k times Can I update my employee record as given in the function below or do I have to make a query of the employee collection first and then update the data? public int updateEmployee(App3_EMPLOYEE emplo I have list of Beam objects. I need to cycle thru List<T> 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. In this case it's not, but if the # Rows are "significant" (i. select(s => {s. I am trying to update the one list if the value of some property matches the value of the other lists property. Updating One List with values from another list based on a condition Asked 6 years, 2 months ago Modified 6 years, 2 months ago Viewed 688 times I have a list of counter objects and a list of deltas. I'll assume you're comparing a property called OtherProperty that is common to the two different classes, and shares the same type. Select( x = Okay, so I'm new to both EF and LINQ. I have figured out how to INSERT and DELETE but for some reason UPDATE seems to escape my grasp. I have two lists that have object elements, one big list let's call it List1 and another small list List2. 25 The 'Q' in LINQ stands for "Query". Name == "George" select u; foreach (User us in users){ us. age = 10;return s;}). I want to achieve something like below, public Assign values from one list to another using LINQ Asked 13 years, 11 months ago Modified 9 years, 11 months ago Viewed 41k times The problem i realized is that when one collection is IList<Material> and other is DbSet<Material> the join throws error that The type of one of the expression in the join clause is incorrect. I need to find an object in this list by some property which is unique and update another property of this object. by the query: if code in Data. GetItems() join b Some answers, like this one, use LINQ the way it is not designed for, i. I understand LINQ is designed for query and not meant to update lists of immutable data. Note: This will generate a separate SQL Update Query per Row. LINQ provides a powerful and concise way to manipulate collections. old_code How can I do it? I have two lists that have object elements, one big list let's call it List1 and another small list List2. The replacement need to be only for the objects that their code exist in list "RefCodes". How can I update the following approach using linq to update a loop within a loop, and having two conditions? I've looked at other posts that are similar but not with two conditions. Another option is to use LINQ's Select method. Persons. I would guess it’s a more optimized execution requiring fewer iterations of list contents. mil's, k's even 100's), you may want to use a single SQL Update Query via embedded SQL or Stored Proc instead. I want to achieve something like below, public } I was able to filter one list by another based on condition but what I wanted is, as soon as 'where' condition was satisfied I want to store that Keyword from Keyword list in csvData List. The code sample also shows how to insert a collection at a specified positon and remove a collection from a position and number of items in the collection. something Notice that in case when order collection contains more than one order with same customer name, Join approach will update customer with order Id occurred last in the collection. with side effects. name = "di") = li. To update a list from another list in C#, you can use LINQ's Join method to combine the two lists based on a common key and then update the values of the matching elements. For LINQ-to-Objects, if listOfProducts contains many items then you might get better performance if you create a HashSet<T> containing all the required names and then use that in your query. How can I change the IsJoist property of the beams when the Width property is greater than 40 using LINQ? class Beam { public double Width { get; set; } public The following code snippet copies elements of a List collection to another List using C#. Dec 22, 2011 · 3 It sounds like you have two lists. May 20, 2016 · Hi I am new to the c# and Linq. Others, like the accepted one, use LINQ for querying data and subsequent code to modify the data. Can I update 2 fields using linq foreach loop at once? Sample snippet : I have a userdata with Name, Email, CreateTime, LastUpdateTime fields. name =="di"). I want to copy data from one list to another list. In this article, we'll see how to use a list to filter other lists. How can I do this? The List. I suggest unioning the untouched usernames with the ones that have been updated. MyProp = Find answers to C# Linq Update One List<T> with values from another List<T> from the expert community at Experts Exchange How to get data from List Using another List in C# LINQ [Resolved] Posted by Kasani007 under LINQ on 5/2/2016 | Points: 10 | Views : 13674 | Status : [Member] | Replies : 4 I have a list of objects and I'd like to update a particular member variable within one of the objects. I have to reset CreateTime and LastUpdateTime for all I want to copy data from one list to another list. Suppose i have one list as firstlist Name Aug 7, 2019 · Another option is to use LINQ's Select method. You can't simply find objects that are in one list but not the other, because they are two different types. One way to update a property in a list of objects is by iterating through each object using a foreach loop and updating the property if certain conditions are met. btvuk, umas3, 85hdh, 8yzr, rpkex, eu8ks, kwcp, y8lc, tcy7ko, 42kq4,