Dynamic linq orderby child collection. var query = from a in db.

Dynamic linq orderby child collection The 0 will cause the ultimate SQL query to come out with an extra column that has value 0 for every row, then it sorts by that row, achieving the dummy sorting, then it applies all Dynamic data. ThenBy(child => child. To make this work, we need to explicitly state the type of each function and set the value-type of our Dictionary<> to dynamic: Is there any way in LINQ to do an OrderBy and then do a ThenBy with the ThenBy using the children of the parent object to do the secondary ordering? Sorting Child Collection in Entity Framework While Building Dynamic Statement. AsQueryable() . Edit I'm trying to build out a Dynamic Expression to access the Child of an ICollection with reflection to use as an OrderBy clause. OrderBy with Dynamic Linq and one to many relationship in EF. It gives me an exception: At least one object must implement IComparable. Elements("ChildElement") . It added dynamic's as an additional bonus. Number)) { /do something with the child item } } Here's my solution (using Reflection and based on DynamicLinq ideas):. How to order by a property in a collection using linq? 5. productimages. Share. I'm using this dynamic linq orderby function which I got from here. Linq OrderBy in select if count is over 0. Set the parents of all the children. With EF 5 it's now possible to use a Where clause inside an Include, but is there a way to use an OrderBy inside an Include? I tried items = items. This should order the ones with a value first, "then" the order of the value. ToList() when I set the times i always use the same day, because I need to show classes on certain days of the week. ProductType. A common feature in various applications is to sort some collection by one of it’s properties, dependent on some input like the column clicked by the user. I'm trying to build an extension method to IQueryable which can sort a collection by entity child property. SomeField" (as opposed to making a ReadOnly Property that returns Central. For example: I'm pretty new with linq dynamic and i need to translate a simple linq query. Ask Question Asked 10 years, 3 months ago. I was thinking about using a LINQ predicate instead but as you can see the the orderby is the main difference and I found no sample using orderby in a query. Entity Framework sorting nested collection. Related. Element("Field2"). OrderBy(e => e. entity framework get entities I'd like to be able to query parent entities and filter the contents of a child collection. productid == 1 and product. Enumerable. OrderBy(c => c. Example: I want to sort on "Stock. OrderBy(child => child. Modified 3 years, 11 months ago. Get(c => c. Create Lists from a List based on a distinct value. I documented how in blog post a while back, which coincidentally was part of this SO question. Order would be either "asc" or "desc"; Using EF Core, How to filter child collection with linq dynamic. 9. Time)); In other words, for each TimeLine, find the earliest milestone, and use that for ordering. See my example below: public class A { public int Id { get; set; } } public class B { public virtual ICollection<A> ListA { get; set; } } Call for data from db: Dynamic SQL-like Linq OrderBy Extension It fails in a way I don't manage to solve though; If I sort by a child object and any item in the collection has NULL in the path, a NullException is thrown. name, operator, value etc. Linq order by parent and child. OrderBy("Company. Name); Or you want a sorted collection as part of the result: As well, LINQ-to-SQL (and possibly other LINQ-to-Something) needs to know the return-type (DateTime, string and int above) of the Func<> at runtime, and this is hidden if the value-type of the Dictionary<> is object. Such as the Minimum or Maximum date. Name; (Note that you can't use a var there because the compiler needs to know that you want it as an Expression<T>). More like, reports that have at least one status of "New", sort first. Date) . ToList(); The null exception is occurring on the Reference. CustomerName" ) fails. Orden) is returning a collection of objects. I have spent almost my whole day trying to sort PARENT based on CHILD collection property using reflection. But the problem here is since the order of fields is dynamic, how do i pass the field and arrange them accordingly ? Dynamic LINQ OrderBy on AgentFire's answer is effectively appropriate, but a bit long-winded to special-case in each situation. on output). MenusSub. The point of creating an extension method is to at least isolate the messiness. Locations. What I tried so far is: var orderedElements = parent. Disclaimer: I'm the owner of the project Eval-Expression. LINQ operations (i. Lamba<Func<Parent, object>> that is similar to this: p. Min(m => m. Parents. Now in regards to how all the reports with "New" should be sorted, it really doesn't matter much; maybe sort those by their reportId. Location. Sorting collection. Your code might provide parameters for the filter, or the sort key, or other expressions that are part of the query. Name. I couldn't find an answer online other than ordering after retrieving the items from the database. FirstOrDefault(); but when it return the result, The child "transmit" messages should stay intact. using For Untype: You can also make use of Dynamic Linq Library : Using the LINQ Dynamic Query Library. And if I write . If I try an orderby clause at the end of the linq it will start at Property and I will need to drill down to the licenses again. – Svyatoslav Danyliv. Commented Jun 23, Sorting Dynamic LINQ By Collection Property. Defining a ConvertableExpression class so we can intercept calls to our custom OrderBy():. Since the child entity is a collection I am having trouble. OR. Improve this answer. The following code sample demonstrates the supported Linq patterns for collection searching: cs public class ClassWithChildCollections The dictionary definition is ok - there is no good way to declare it to have values with different type. public class ConvertableExpression<T> { public ConvertableExpression(Expression<Func<T, object>> expr) { this. OrderBy(x=> x. Is it possible or are there other Do I understand you correctly that you want to order your root ids by the "numeric" field of the child ids matching "mySendendId"? – Christoph Sonntag Commented Jul 27, 2021 at 18:16 I have a collection of objects called Gigs. ToString()) . Viewed 53k times 80 . Convert for value type properties. OrderBy(step => step. LINQ 'in' clause for child object properties. I tried to put it directly, but it throws an Exception: collection. Name OrderBy because Reference is nullable. sequence) }). See See: Entity Framework Dynamic Query Library. Empty and all items with null property will be pushed to back or front of collection depending on asc. order = order; } private int order; private SortedList<int, MyType> children = new Sorting Child Collection in Entity Framework While Building Dynamic Statement. act. The library also contains extension method for dynamic LINQ. OrderByDescending(foo => CalculateBar(foo)); } private int CalculateBar(Foo foo) { //some slow process here } The type arguments for method 'System. Dynamic Linq library, but I'm not interested in this solution - I'd like to learn how to overcome it without using 3rd party libraries. I need probably generic IQueryable<T>. c#; linq; Building an OrderBy Lambda expression based on child entity's property. If you don't know the sort direction at compile time, you need some sort of conditional to chose OrderBy or OrderByDescending. Order by child collection in entity framework. For eager loading relationships more than one navigation away (e. How to OrderBy using a child collection in lambda expression. Here is Skip to main content. So as usual with dynamic queries, you have to resort to System. C# LINQ Orderby on parent only in How can I run a dynamic LINQ query on a collection of a base type (like the IPerson interface) but access implementation specific properties (like Age). That would be: var sortedCode = records. You can define the function outside the OrderBy() clause:. Sort LINQ query by child collection's child property? 2. I don't like Concat() and ToList() in there. I want to query this collection using LINQ to return all OrderHeaders, but I only want some of When I try to use the System. OrderType)). Sorting Dynamic LINQ By Collection Property. 1 to many with the original 'subject'), EF Core has a new extension method, . OrderByDescending ( user => user . /* property */): users. ID); It's an awesome little library that allows you to dynamically generate LINQ expressions from strings, which is perfect for things like sorting collections by object property A better way to do dynamic OrderBy() in C#. ProductTypeName). TotalGrade and as you can see both LINQ querys are almost the same statement with only a minor difference. Accessing child collection in query. FromSql definitely cannot be used to mix SQL. SomeField). @CharlesOkwuagwu The dynamic Where is quite different, mainly the signature (parameters) and the operations supported (e. None of the collection types in . Dynamic LINQ provides a full solution for both problems, but if you want a customized method for your need, you might post a question and I'll be happy to look at it. SortOrder. orderby certain property - code improvement. 573. The code sample below provides IQueryable extention methods for OrderBy and OrderByDescending, and can be used like so: query = query. One way is to implement IComparable's CompareTo() method, but it can also be done using Language Integrated Query (LINQ) like this. Core Here is my example: I have a collection of Customers and each Customer has a collection of Orders and I want to sort the Customers based upon the recency All I am trying to do is OrderBy a list of records by the Count() of a 3rd child in the relationship tree. I don't know how you get the value of the stored procedure, so I just called a function that would do I am doing hierarchical data binding on a grid, and I need to have the database server perform the sorting on my objects. SomeField"); However, I still face the same issue when it comes to a collection of items (Equipments). Date) having something like. Ultimately what I would like is an end result of an Expression. List<Category> categories = db. A has a collection of B and B has a collection of C. I can be sure that all items in the collection are the same, i. Include(i => i. Linq Dynamic OrderBy. In most LINQ queries, the general shape of the query is set in code. Linq Sorting on list and its nested collection of same class. Since your custom object probably doesn't implement IComparable and IComparable<T> it's throwing the exception you see, which makes sense because it doesn't know how to compare two instances of your Menus type. quantifier operations within child collections. Supossing i have this classes . 14. ToList(); I can't seem to translate this to Dynamic Linq. i know that LinQ has orderby and thenby function. Keep NULL rows last on Dynamic Linq Order By. I have this two classes: public class Publication { public int Id { get; set; } public string Name { get; set; } public List<Product> Products { get; set; } } public class Product { public int Id { get; set; } public string Name { get; set; } public int PublicationId { get; set; } [ForeignKey First of all, calling OrderBy on the list, the way you do, won't sort it in-place. OrderBy) returns a query. Just an example, this is the situation. ToList() on that to turn it into a list, but it will still be a copy. To make it work with EF, the convert expression must be removed and corresponding Queryable method must be called dynamically. Name asc") . I want to use this in . Building an OrderBy Lambda expression based on child entity's property. But, what I got is that y. Dynamic LINQ OrderBy for a Navigation Property using Expression in C#. Dynamically sort with linq C#. You might filter items using a where clause, sort the output collection using orderby, group items, or perform some computation. e. Good to Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Querying Child Collections in LINQ. GetName(x. Min(l => l. : query. That's why ordering by a string works, it'll order by the provided property name. For each parent, then print the children. Join/Where with LINQ and Lambda. ItemProductTypes. OrderItems. Viewed 2k times 0 . Include(c => c. IQueryable is also has dynamic nature and it is possible to create OrderBy dynamically. C# OrderBy on nested object Property. V_STF_CUSTOMER WHERE company_id=@company_id AND ORDER BY CASE WHEN ISNUMERIC(customer_name)=1 THEN 1 ELSE 0 END, customer_name From your gist below I have found a easy way t flatten the properties across all base types and interfaces as demonstrated on this post. Than you should be able to declare: partial class Form { public IQueryable<FormItem> FormItems { get { return PrivateFormItems. There is a function which creates a dynamic order by parameter as a string. the . Linq sort child in query. You need to assign the result of that query back to your variable: lst = lst. Things to note is my use of EFCore5 and Automapper ProjectTo extension method. descending sorts. I have an app that accesses database and has to order results by different fields depending on the input. You should probably consider using OData or Dynamic Linq – If you don't want to make extra trips to the database, you will have to construct your own query and project the parent collection and the filtered child collections onto another object manually. NestedObj. Is it possible to dynamically build an IQueryable/Linq Expression with filtering criteria based on a NESTED/Child List Object's Property. ). But your real problem is that you are trying to use a StudentInfo object, which you haven't created yet. Linq. I want to sort the list based on the input order of the three which changes dynamically. When performing the I'm trying to order by an attribute of a related object. 11. I have following statement in ordinary linq var result = DBContext. OrderByDescendingDynamic(x => "x. EHR". Now when I get data from parent entity, it returns a collection of data with its child data too. The first OrderBy will work, then others will not work inside ThenInclude. For this example, if possible I would like to keep it simple; I would rather not write code that modifies an Expression Tree. Generic. Asking for help, clarification, or responding to other answers. Please add dynamic-linq tag and update the question accordingly. Expression. LINQ - orderby using child collection with condition - ArgumentException. " var query = DataAccess. Func, System. Given this parent - child (collection) model below, is it possible use OrderBy Client based on createdDate property passing the Id of the specific Address to sort with? Introduction. id = 7; So I started writting return from gig in qry where gig. lst). Schedules. Today; you want to sort the future values first in ascending order Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. What is the preferred convention for this? --EDIT-- Based on Robert's suggestion I flipped the query to get the Licenses first but I guess I need to do some projection since this query only gives me the Property I'm using PredicateBuilder and LINQKit to build a fairly complex dynamic query. In your implementation you are actually supplying another collection which is sorted (this is irrelevant though). Order) The Include method now supports Expressions like this, but I'm not certain if it supports ordering too. I need to get the groups ordered by the group name and then by the location sort order. because there is no filtering on child collection and results are filtering properly. I. Follow answered Apr 27, 2010 at 17:01. PS: My child collection property has lazy loading enabled. They could choose AcctNum (asc), AcctDate(asc) and finally AcctName (asc). Modified 10 years, 3 months ago. You want to get the price group, and have the price regions sorted by PriceRegion. var baseDate = DateTime. This will help you to solve dynamic sorting. As for the example, the order by function would do the ordering for Child collections in the parent. I have a collection with name,date,category as parameters. X <= Y). OrderBy("ProductId"); Extension Method: This is using System. I want to order by the contents of column1. But for the moment I have no really >good way around that. e. thenby(). C# Dynamic linq order by expando object. Dynamically sort collection navigation property using linq. Brannon Brannon. Trans. AcctNum) I could do it using Dynamic Expression API. g. Let's say I have a basic AcctNum, AcctDate and AcctName record and each field can be sorted by the user. Type to check for I have a collection of class objects: Tests This collection contains many Test instances:. Sorting Nested Collection with Linq. OrderBy("Central. public class Test { public string column1 { get; set; } } I would like to use LINQ to order the contents of Tests and put into a new collection called TestsOrdered. E. Collections. List<Foo> foos = new List<Foo>(); // assign some values here var sortedFoos = Linq orderby StringComparer dynamically. Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T> 520. DayOfTheWeekTypeId == dayOfTheWeekId)) . I've got a collection of products, and each product object has it's own ProductImages collection. Is there any reason why I shouldn't do OrderBy always last. ThenBy(v=>v. Here is code I am using that works but returns Thanks Alvin. I think the problem is that the LINQ API is "messy"--it forces you to use a different function for ascending vs. Name asc, Reference. Details : I have a parent entity with its child entity linked. 1. Exactly the way you'd write the lambda: Expression<Func<StudentInfo,object>> sortExpression = si=>si. Select(c => Property. /desc. Order)). 1) projection combined with a Linq OrderBy Child property expression. DisplayOrder); } } } In LINQ it would look like this: var a = collection. I'm getting a collection of records in I have the following classes: public class Product { int Id; string Slug; ICollection<Price> Prices; } public class Price { int Id; float Amount; PriceType Type; } p employees. This library allows you to evaluate, compile, and execute code at runtime. Follow OrderBy with Dynamic Linq and one to many relationship in EF. I need some help with ordering an entity collection of groups by a child entity column. Below is extension method to check for null if you want to sort on child property of a keySelector. ChildProperty)) but this didn't work. Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T> 884. public IOrderedQueryable<ProductDetail> GetProductList(string productGroupName, I have an object graph that I'm loading from a database using EF CodeFirst and AutoMapper into DTOs:-public class Foo { public int Id { get; set; } public virtual ICollection<Bar> Bars { get; set; } } public class Bar { public int Id { get; set; } public int FooId { get; set; } public virtual Foo Foo { get; set; } public string Name { get; set; } public int SortOrder { get; set; } } I've read about "dynamic LINQ" but that's not going to address the issue when you need to orderby(). Could someone help me with ordering nested collection in linq to sql. Dynamic). Just key the items by their order when you add to the list. Func)' cannot be inferred from the usage. This C# example uses the LINQ OrderBy method with a dynamic expression to sort a list of products by name. Include(h => h. Cheers. Although if I do a Parent. Single(t => t. How can I convert this query to linq to entities with entity framework: SELECT customer_id, customer_name, customer_code FROM dbo. OrderBy( o=> o. 8) it doesn't work anymore. Of course if the milestones are in order, you could use: It worked fine and sorted the collection first by publicationType and then by the newest date. Hot Network Questions var steps = allsteps. // returning property as lambda from string public static Func&lt;T, object&gt; GetPropertyFunc&lt;T&gt;(string property) { I am trying to do something similar to this sample code from Phil Haack to VB, and LINQ Orderby is giving me problems - and I can't figure out how to do this. CustomerName ) if creating . NET Dynamic You are confusing LINQ operations with a method that changes the variable it is applied to (i. Just changing the signature should work, because you start with OrderBy. public static bool PropertyExists<T>(string propertyName) { return typeof (T). OnSorting() and create sorting expression dynamically using LINQ I have a query of IQueryable and want to apply sorting to it dynamically, sorting can be on many columns (asc or desc). Full article : Handle GridView. The function order by is to order the collection. The child elements contain multiple elements that are not mandatory. I'm getting a collection of records in a DataTable and binding it to a grid control. OrderBy(t => t. By not making it dynamic works. LINQ equivalent of foreach for IEnumerable<T> 637. – If you are using plain LINQ-to-objects and don't want to take a dependency on an external library it is not hard to achieve what you want. If you want to sort the collection "on-demand", just use LINQ: foreach (var product in order. So for mey it may be best probably to use dynamic assembly compiling to create OrderBy method calls which have hard-coded names like. Improve this question. ObjectQuery to return object where a child object contains a set value. SomeField. Ask Question Asked 11 years, 4 months ago. How can I apply sorting on navigational (child) properties? 1. The downside is it only works if Property is string type. Commented Jul 15, Dynamic Linq Core OrderBy Nullable Child Property. DataTable - Dynamic Linq OrderBy using Lambda expressions. OrderBy("publicationType", "date desc"), it doesn't affect the collection. Columns(e. FullName" where ChildObject is an instance property on the MyObject1 type. I'm trying to sort a child collection while building my entity framework statement. Order by child table in entity framework. Wiki: Eval Dynamic LINQ. AsQuery In addition to @Daniel Brückner answer and problem defined at the end of it:. The following code works for the where expression, but I can not figure out how to create an order by expression. Dynamic Order By in Linq. sort. Repository . The model structure looks a bit like. EntityFrameworkCore; In this article. For example, the sort property may not be in the result: var result = context. imagename where products. Bs. Name)). – Tommi. private static LambdaExpression GenerateSelector<TEntity>(String propertyName, out Type resultType) where TEntity : class { // Create a parameter to pass into the Lambda expression (Entity => Entity. Core nuget on my API and added the using statement in my Specification class, but then when I try to pass a string into the Query. Value. ColumnIndex). Hot Network Questions Sorting Dynamic LINQ By Collection Property. Linq dynamic sorting on child properties. Linq. Complex LINQ sorting using Lambda Expressions. I have not included all code here - particularly the code around Pagination but I hope there is sufficient detail. Name) </code></pre> returns the I have the following which works brilliantly with the dynamic linq library: string where = "Price < 5"; string orderby = "BookID ASC"; IQueryable<T> MyDataQueryable = _DataRawBase. Name == "EmployeeStartDate"). Thank you for your help ! :-) c#; linq; entity-framework; frameworks; entity; Sorting Child Collection in Entity Framework While Building Dynamic Statement. Dynamic to order the result set dynamically. How can I apply sorting on navigational (child) properties? I'm creating a proof of concept that uses Lambda/LINQ for dynamic where and orderby. Linq OrderBy Any Property. ToList(); I get the following string expression provided: "ChildObject. X); As "vc 74" pointed out in his comment, if X isn't primitive or doesn't implement IComparable or IComparable<TypeOfX>then you're not going to be able to order your list, with or without LINQ. First you create one, then sort by it; Notice: I know I can use for ex. System. grand child or grand parent relations), where the intermediate relation is a collection (i. another alternative is grouping the sub-collections by I am trying to build an expression tree dynamically for sorting. Count() there aren't 0. qry. OrderBy(s => s. 0). ChildB)) Based on API, I can have multiple parameters which can be used in order by. At first I had the exact same code as above, however I was forced to choose a default column for the first OrderBy()-- I did not know I could put 0 there instead. I believe the problem is that s. The only things I've done differently is using enums for field names and sort directions which works great in my WebForms apps using ViewState but I'm not sure how I'd maintain the "sort state" in MVC ;) I'am trying to write following in Dynamic-linq. Children. Where(step => step. This is how I am setting the I installed the System. There may be reasons to use OrderBy not as the last statement. SubCategories. OrderBy("x => Enum. ToList(); EF Core. SequenceNumber)) { } Share. I am getting the following error: "must be reducible node" My DTO objects are as follows Dynamic LINQ OrderBy for a Navigation Property using Expression in C#. var query = from a in db. That query looks like you're using custom databinding and/or ObjectDataSource, regardless, there is a way to do this using an extension method which takes a sort expression and dynamically appends an OrderBy() call (expression) to the linq query. requestedUser. Entity Framework 4 - List<T> Order By based on T's In theory, y then should be filled with a collection of children sorted descendingly by their age (assuming "Age" is a property of Child object). This may affect which Dynamic LINQ OrderBy extension method is being called (there are two), and It works fine. OrderBy(b=>b. Fields in the selected child collection can be static, however I would like to dynamically pass a list of fields in the current entity, and also fields in other entities, referenced by navigation properties. Sorting Multiple Levels of Child How do I query a collection of objects in LINQ by a child property? 5. This worked like a charm for me. TimelineCollection . Result The sorted list of words (by length): apple cherry blueberry OrderBy - Simple 3. Trim (); //parse the order by statement string sortExprRegex = how can i create an extension method for performing orderby dynamically on the child navigationproperty which a. IEnumerable, System. SortOrder sort with linq C#. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The way I understand, you have a DateTime property (ley call it Date), and instead of regular sort. See the following questions for examples: Linq To Entities - how to filter on child entities LINQ Query - how sort and filter on eager fetch. I'm using System. It doesn't make sense, even if you write data on a paper you can not tell what result you want because it's a list in a list, you can sort your sub-collections but not the parent list. Dynamic, a small library on top of LINQ. Orderby not working. Expressions. LINQ Queries with dynamic Order By. 567. So I implemented the extension method for PropertyInfo that will return all properties from all interfaces and I want to write a Linq that return all orders with their items,Product,ProductType and items be sorted by sequence field. I have several dozen checkboxes on a form and am passing them back as: Dictionary<string, List<string>> (specifically, Dictionary<fieldName, List<values>>) to my LINQ query. /* property */ ), _ => throw new ArgumentException (), }; Enter fullscreen mode IsNullOrEmpty (orderBy)) orderBy = "StartDate"; orderBy = orderBy. Month10 is a SubObject and EHR is the property. The column selected to orderby is "Month10. Linq to Entities: adding a where condition to a child relationship. Join(DBContext. Sort LINQ query by child collection's child property? 3. Count() = 0. I'd add an extension method: EDIT: Apparently, the code below doesn't correctly determine whether the query is already ordered; even the unordered version implements IOrderedQueryable<T>, apparently. MileStones. MS Dynamic Linq library has dynamic I have a table that I am writing some C# selenium automation for and need some help using Dynamic Linq. I am looking for a nice trick to turn the -1 of the first >example into a big number. You might be better off sorting the subcategories when you use them, probably in your view. Name" and one item has Tour = null. c#; linq; reflection; asp. Entities . It works well with flat properties but it is not designed to work with nested fields like someObj. an instance method of the object). Using Linq I want to query my collection of gigs to get all gigs where with an act that has an id of 7 for example. I can easily sort the parent collection, but I can't seem to figure out how to also sort all the child collections. Customers. It will return a new sorted IEnumerable; you can use . Each Gig has an Acts collection. It does not perform the operation on your object (i. The problem is that Expression<Func<T, object>> definition generates additional Expression. According to your comment on one of the current answers (which should really be part of the question):. I want to order object A by the Ordinal (int) property of C. It is really slick. OrderBy(stringVariable) I get the following error; I've extended your functions to add support for Child Properties. The type arguments for method 'System. 0. Expression; int count = 0; A few additional rules where implicit: Sorting. Example // using Z. I have a model which has child collections nested 3 deep, and all of these collections need to be sorted. I tried updating the above extension method with Ienumerable but it does not work. An implementation might This article explores building a custom LINQ method named CustomOrderBy that allows you to dynamically construct and apply sorting logic based on a list of criteria, You might filter items using a where clause, sort the output collection using orderby, group items, or perform some computation. 0. Dynamic. Update all objects in a collection using LINQ. Original Source. string [] If you ever wondered how you could dynamically filter and/or sort your queries without having to write a huge switch statement with all the possible properties and operations, OrderBy (user => user. Date)); This is just an example and assumes that the Trans collection does always contain an required matching entry. The first thought might be to do it like this (filtering code removed for clarity) How to use LINQ with dynamic collections. Expression tree for child collection List<string>. ChildObject has a property named "FullName" and I want to sort a collection of type "MyObject1" based on this child properties "FullName" value. ToList(); //note that ToList is here just to execute the query and get the objects in memory foreach (var p in parents) { //do something with parent item foreach (var c in p. Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T> 14. Using sequences for unique identifiers. ThenInclude(), and the syntax is slightly different to the older EF 4-6 syntax: using Microsoft. OrderBy(System. ReportRoleMemberships) . I am using Entity Framework Core (version 1. MediaGallery (one-to-many) MediaGalleryItems (one-one) MediaItems LINQ - orderby using child collection with condition - ArgumentException. Child. To make this clearer, imagine your PriceGroup entity has a collection of PriceGroupPriceRegion child entities, and each of these has a (single) PriceRegion child property. How do I order by child objects in LINQ? Classes A, B, and C. Dynamically Sorting with LINQ. default will be String. For instance, something like this: public static class QueryableExtensions { public static IQueryable<T> OrderBy<T>(this IQueryable<T> source, IEnumerable<SortModel> sortModels) { var expression = source. e result1 is a collection of anonymous objects as it should be and result2, result3 and result3 are collections of Player object where not all properties has been populated by EF as i asked to do using projection. dynamic sort in linq. You can just cast it, because you know for sure that you have an IOrderedQueryable<T> from the previous call to either OrderBy or ThenBy. So this is the Correct answer!! FOR OTHERS LOOKING - If you do OrderBy inside ThenInclude, EF core will use the PK first then the orderby field, so your sort will not have the expected outcome. PropertyName was the name of one of the property of SomeDto (the equivalent of a nameof on them); Sorting. Acts //not sure how to do this bit select gig; I want to sort a list of objects using a value that can take some time to compute. Sort by number of child records using LINQ. If the Trans is just a collection of dates, then you need to decide on which date to use. Is there a way Compare first child with linq dynamic-2. Products. How can I make it to accept different Property type without creating a bunch of methods for different data types?. C. Then you will need an IOrderedQueryable<T> for the ThenBys. OrderBy(r => r. OrderBy Parent object by Nested Collection. username. LINQ - filter child collection. If you use the OrderBy() LINQ extension method, you can pass in a predicate which could be something like (untested): Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T> 7. Core library to order a list, I am getting a NullReferenceException. OrderBy(x => Enum. I do'nt know IL. Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T> Related. Expressions; // Don't forget to include this. That is where the DayOfTheWeek object comes into play. Sort using Linq. 4. Now on to the sorting itself. OrderBy(x => x. But recently I had to implement a Dynamic Lambda Expression to get result with its child entity with filtered data. When you click the column header, this statement: <pre><code> dgvComponents. IComparer)' cannot be inferred from the usage. Answer provided by - xmojmr. Here is my function for sorting: IQueryable&lt;Entity&gt; GetSortedData(IQueryable&lt;Ent I used the following methods to construct Order By Expression. NET. Select(e => e. 3. Your code might provide parameters for the filter, or the sort Many times, we need to handle SQL-like OrderBy in C#. For Example: In the Where statement, I take the collection of Hotels and from every item in this collection, which I conveniently identify with identifier hotel I create a new object of anonymous class, with two properties: StoredProcedureValue and Hotel. MyChildren. LINQ OrderBy/ThenBy ChildrenCollection. But I want this to order the dynamic I bet the type of q is IQueryable<T> and not IOrderedQueryable<T>. Then you should be able to simply sort by messageName where there are no parents. Can a man adopt his wife's children? How to replace matrix indices as subscripts How am I supposed to put a thru-axle hub in my truing stand? Based on your insights I did some more searching and came across Marc Gravel's answer here Dynamic LINQ OrderBy on IEnumerable<T> (second post). Some SubObjects don't exist and therefore don't have a property, and the subobject will be null. Using source. You really need to not just order the items in the collection, but make a copy of each item which would have its Children sorted as well. How to order a nested Linq object via orderBy. How to dynamically add OrderBy() to an LINQ query. Any. You can keep the children sorted if you use a SortedList as your underlying children collection. OrderBy( "Customers. The compiler attempted to figure out how the string parameter was actually a Func and then decided that it What is the best way to assemble a dynamic WHERE clause to a LINQ statement?. For now I have code like this: public IEnumerable<Foo> SortFoo(IEnumerable<Foo> original) { return foos. 1k 5 5 gold badges 41 41 silver badges 44 44 bronze badges. Each ProductImage object has a IsMainImage bool field. Before binding it I'm sorting the data based on few conditions. OrderBy(i => i. OrderBy but not sure h This is my code which generates property of T object by property string. What is missing is the orderby for the next nested collection. I am wondering if anyone has any experience attempting to order on a Collection within a Collection using the System. linq how to select the parent from a collection where the parent contains child items in another collection. post your SQL or better LINQ query which do the same. GetValue(c. I would like to do this with LINQ as later I want to add more to the ordering. Sort LINQ query by child collection's child property? 1. OrderType) ascending") In my code I need to sort a collection either by Price or by Rating. Modified 8 years, 6 months ago. linq order by based on multiple columns and various crietria. looking at the first type I can assume that the others are the same. 26. 7. Tour. Otherwise each orderby is a separate operation on the collection re-ordering it each time. GetProperty(propertyName, But if I attempt to access a child property of my TvRequests object it will not work e. 1. Select(o => new { order = o, orderItems = o. Many times, we need to handle SQL-like OrderBy in C#. Core NuGet package. var parents = context. A orderby a. StartDateTime)). Ordinal) <--- ?? select a; I can't seem to figure out the orderby statement for this. Sorting Child Collection in Entity Framework While Building Dynamic Statement. How can I write a query such as following query? . Where(l => l. net-core; entity-framework-core; Share. OrderBy(p => p). Shipping. public class Parent { public int Id {get;set;} public ICollection<Child> Childrens {get;set;} } public class Child { public decimal exampleData {get;set;} public decimal moreData {get;set;} } I am having an issue using an AutoMapper (version 5. Element("Field1"). The dgvComponents is a datagridview that is bound to an observable collection. Any(s => s. Sorting Data using LINQ. It orders a collection by the value you determine in the lambda expression and then returns an enumerable. Ask Question Asked 8 years, 6 months ago. I guess by "string version" you mean the so called "Dynamic LINQ" (or System. In the new version (4. For dynamic ordering most convenient way I found: string propertyNameForOrdering = "UserName"; var list = context. Background. The OP is asking about OrderBY, which is not the same as the DUPLICATE answer. Marten V4 greatly improved Marten's abilities to query within child collections of documents. OrderBy(p => p. This C# example uses the LINQ OrderBy method with a dynamic expression to sort a list of words alphabetically. Try specifying the type arguments explicitly. Linq to Sql You should consider what OrderBy does. Func<Item, Object> orderByFunc = null; I would like to ask you about a way to dynamically create a LINQ Select expression with a nested child collection. Report . . OrderType. Sorting a gridview when databinding a collection or list of objects. Then you can expose the Values property to get the values. var myFinalOrderedList = myList. Name asc, Process. OrderByField). Then "Updated", then "Ignored". OrderBy(o => o. Viewed 3k times Dynamic LINQ OrderBy on IEnumerable<T> / IQueryable<T> 639. I have a one to many relationship from groups to locations. 5. ) prior to pagination. Categories. 8. Get Counts using Linq to i. – Ivan Stoev. Currently we have a package that generates linq select dynamically from fields from string. If you One option is executing the query and sorting in memory (e. I'm having a hard time building a Linq query like this: select products. 6. GetType(), x. That's the reason why the child property is sorted but grouped by parent. Net First, Make FormItems private and change name to PrivateFormNames in designer. This is an OrderBy extension which takes a SQL-Like OrderBy string and sort C# Dynamic LINQ OrderBy examples using an Expression Evaluator. This article explores building a custom LINQ method named CustomOrderBy that allows you to dynamically construct and apply sorting logic based on a list of criteria, supporting both single and Now, by using some dynamic linq code I was able to make this work for my many-to-one columns by passing "Central. This is an OrderBy extension which takes a SQL-Like OrderBy string and sort a IQueryable or IEnumerable collection. Order By in Linq to Entities. Provide details and share your research! But avoid . 2. But now, I'm stuck. EDIT: I am using Linq. I have the following class: public class ViewPaymentOrder : Entity { public string ClientName { get; set; } // other properties public PaymentOrderME PaymentOrderME { get; set; } } Dynamic LINQ OrderBy on IEnumerable<T I think it's not possible without doing a join between the two parent objects and afterwards sort the children. The sorting will happen at the action filter of my web api. Include("Child"). The OrderBy() clause accepts a Func<TSource, TKey> that gets a sort key from a source element. ismainimage == true This is fine for internal collections, however this will not work where the sorting is to be done at source (be that SQL, MongoDb, etc. Linq: select parent based on sub collection. Expression = expr; } public Expression<Func<T, object>> Expression { get; private set; } } Suppose we have a class Foo which has an Int32 Field Bar and you want to sort the collection of the Foo objects by the Bar Value. With dynamic linq you can pass string to the OrderBy methods as well as many other of the IEnumerable extension methods. For example, I have a collection of OrderHeaders. I have to order the child elements of a XML element. SequenceNo == 1). , public class MyType { public MyType(int order) { this. { get; set; } (and possibly the inverse children collection). olzl nipt msgrqr lzdk ziba pam bqrphg lgh miro jnz