Linq orderby string property name. How does OrderBy O...

  • Linq orderby string property name. How does OrderBy Operator work? A simple breakdown of how OrderBy Operator works. Dynamic Linq: OrderBy Using a String for a Property Name Now this is kind of dangerous to do since there is no compile time check (Like most things set in markup) but say you want to sort a collection, using the Linq extension methods, but you don’t know what you what to sort on at any given time. For IQueryable I use Dynamic LINQ to do such ordering, for I know how to order by one property, then another property. dvm. I would like my Web API to be able to sort its output by a string parameter such as this one: http://myapi. Core handles the rest, translating it to proper SQL ORDER BY clauses. Enumarable and System. Expression<Func<'Source, 'Key>> -> System. Diagnostics. an instance method of the object). There will come a time when you need to order an array or list of objects based on a particular property. Where(p =&gt; p. CreateQuery<TEntity>(resultExpression); } orderByProperty is the Property name you want to order by and if pass true as parameter for desc, will sort in descending order; otherwise, will sort in ascending order. Input: You start with a collection of elements (e. Is there a way in Linq to do an OrderBy against a set of values (strings in this case) without knowing the order of the values? Consider this data: A B A C B C D E Now I have a way that works for single property values (code to follow). OrderBy("Name, Age DESC")) for ordering. My Wcf service gets string PropertyName to order queries results. What's the simplest way to code against a property in C# when I have the property name as a string? For example, I want to allow the user to order some search results by a property of their choice (using LINQ). Core library for more complex scenarios. Please add dynamic-linq tag and update the question accordingly. Your keySelector currently returns the same string for each (the property name); and since LINQ is typically a stable sort, this results in no overall change. OrderBy("City",true); or existingStudents. # OrderBy Linq example. Tags: c# linq I need to sort a string alphabetically. The teachers are sorted primarily by city and secondarily by their family name, both in ascending order. Queryable classes. Example of LINQ OrderBy Method using both Method and Query Syntax. When Should We Use the LINQ GroupBy Method? What is LINQ GroupBy Method in C#? I have a method which is given the parameter "bool sortAscending". OrderBy 就 First Approach: When you don't have Dynamic Linq: If you are using using System. descending. Expressions. When using the OrderBy method, by default it's as item => item. Core, then you can use this approach: orderBy is the string and Student is the T (The Entity, in which we want to search). e. You could also put the strings into an array, list or Dictionary in the order you want them sorted (or containing the sort order as the Value in the case of the Dictionary). CodDipendente == 1); if(orderBy To sort by a dynamic (runtime) column name, you have a few choices: 1. In query expression syntax, an orderby (C#) or Order By (Visual Basic) clause translates to an invocation of Learn how to dynamically sort your `C# ` collections using reflection to access property names and LINQ's OrderBy and OrderByDescending methods. Frequently you have some strongly typed object and you want to order by some property on that object. . The input to the OrderBy or OrderByDescending methods is either a Lambda expression, or the address of a custom function. Language-Integrated Query (LINQ) is a domain-specific language for querying data from various data sources, including arrays, lists, XML files, or databases. the concern is you have the list of object not particular class so how can you assure that all the object inside the list have the property named as "Code". g. Use Expression tree classes and build your own OrderBy lambda 2. Sort((x, y) => x. Now you should be able to do existingStudents. the . OrderBy) returns a query. LastName, emp. The one that is actaully used in the view. NET 3. 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 names passed as querystring parameters to web api controllers, it even allows you to sort by child object property names! The result of GetAllList() is a List<T>. This method compares keys by using the default comparer Default. Provider. LINQ operations (i. Movies orderby row. In contrast, an unstable sort does not preserve the order of elements that have the same key. You can specify multiple keys to perform one or more secondary sort operations. RequiresDynamicCode ("Enumerating collections as IQueryable can require creating new generic types or methods, which requires creating code at runtime. better to create the list of specific type. Since you have already projected to the string values, you can simply use a trivial x=>x mapping here: Select property by string name using LINQ Asked 13 years, 1 month ago Modified 10 years, 4 months ago Viewed 9k times Learn about the different approaches to ordering data in LINQ with keywords such as LINQ OrderBy, LINQ OrderByDescending, LINQ ThenBy, LINQ ThenByDescending. Get around needing strongly typed order by clauses. The LINQ to SQL engine parses the expression you pass to the OrderBy method in order to obtain the name of the property you are referencing, then uses this information to compose a plain SQL order by clause. Use Dynamic LINQ and use a string OrderBy. Unfortunately, this method does not accept a string value with the column name. The most common solution I have found is to use linq: OrderBy Linq example There will come a time when you need to order an array or list of objects based on a particular property. Method syntax Below we have a list of cities that we want to order the Learn how to create LINQ extensions that will simplify pagination and ordering by property names in Entity Framework. PagePermissions is a property on my ViewModel of type List T in this case T is a EF6 model class called page_permission. Below are two approaches: one using reflection for basic scenarios and another using the System. Note that OrderBy is an extension method and has implemented in both System. NET] [LINQ] OrderBy String (By Property Name) Linq 所提供的排序方法，必須要傳入強型別的屬性給 OrderBy，但有時候還是會用到欄位字串排序，比如說點選 GridView 上的 Column 進行排序，它處理起來其實不難，只要將屬性的值拿出來餵給 IEnumerable. Orderby(c => c. Example: var nameSorted = from emp in employees orderby emp. In C#, ordering by a property dynamically using the property name as a string can be achieved using reflection and System. Include("Anagrafica_Dipendente") . Detailed solutions provided. I got then this: var ascendingQuery = from data in data 67 Using reflection and expression-trees you can provide the parameters and then call OrderBy function, Instead of returning Expression<Func<Task, T>> and then calling OrderBy. Create a Utility class, something like this: (you can anytime covert to extension method If you wish. Imagine you have a scenario where you need to sort data based on user-defined criteria. Linq. Lets say for instance the main object (that is in the list) has a Name property the type of which is… 2 This is a generic sorter. static member OrderBy : System. What is LINQ GroupBy Method in C#? How Do We Use the LINQ GroupBy Method using Query and Method Syntax? How Do We Use the GroupBy Method and the OrderBy Method in C#? Multiple Real-Time Examples to Understand LINQ GroupBy Method. This method is used to sort the elements in the collection in ascending order. OrderBy(n => n. Same I would like to achieve with select either OrderBy or OrderByDescending depending whether I get sortdirection = "asc" or sortdirection = "desc" Is it possible and if yes, how? Build the sort string — Valid properties are assembled into a System. Now unfortunately the Id field I have to sort by is not always called Id nor is the Text field. No problem — Linq’s IEnumerable. OrderDate)); If you prefer to create a new, sorted sequence rather than sort in-place then you can use LINQ's OrderBy method, as mentioned in the other answers. But what about when you don’t have a strongly typed object at runtime and you only have the property’s name? In a little project I’m working on at the moment, this came up. Name); When taking a look at the orderedMeasureStations query result, it looks like the following: entry starting with: Learn how to sort a list of string names in C# using the LINQ OrderBy method with this comprehensive guide. var list = someelements. FirstName select emp; sorts employees first by last name and then by first name. Name select row I'm refactoring old-style query CreateCriteria() to QueryOver(). OrderBy(x => x. The OrderBy () Linq method generates an IOrderedEnumerable with the list’s items sorted in ascending order. UserNameSortDir is a string property on the viewmodel that holds the next sort direction. 5 and later we can use the System. This method performs a stable sort; that is, if the keys of two elements are equal, the order of the elements is preserved. Dynamic). They can be other things such as MyId, SomeTextField and so on. , a list, array, or LINQ query result) that you want to sort. or having multiple type use interface type list 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. Core library for more advanced dynamic sorting. The problem is when the property I want to sort on is part of another object. OrderBy("City",false); <p>For . return source. An implementation might take a string or enum for the column plus a bool or enum for ascending vs. Learn how to use a generic extension method to apply OrderBy on an IQueryable using a string column name in C#. ---This video Mar 23, 2012 · The problem of having the property expressed as string is that the OrderBy method accepts an Expression, so you only need to convert the string to the appropriate expression. I'm wondering if there is a linq way to order by any property (or multiple properties at the same time). With the example below, we will be using strings. OrderDate. Linq; instead of using System. Given a list of string names, now our task is to sort the names given in the list using the OrderBy () method of LINQ. Unfortunately, the method included only works on IQueryable<T>. Now I want to use LINQ to create sorted list depending on this parameter. Name). I guess by "string version" you mean the so called "Dynamic LINQ" (or System. OrderBy () to the rescue. com/api/people?skip=0&take=50&orderBy=lastName&descending=true. Here’s how it works: The OrderBy or OrderByDescending methods can be applied to any LINQ query. [C#. Same I would like to achieve with select either OrderBy or OrderByDescending depending whether I get sortdirection = "asc" or sortdirection = "desc" I want to do this: var orderBy = "Nome, Cognome desc"; var timb = time. More correct is from row in _db. The solution is quite simple, you can find the solution in this post, the above code is a slightly variation of the code you find in the previous link. CodeAnalysis. So I was wondering if there was a way I could do the OrderBy() and OrderByDescending() clauses by supplying a string for the field name something The following example demonstrates how to use the orderby clause in a LINQ query to perform a primary and secondary sort. For example a list of names: As a one-liner this wouldn't be too bad. Core compatible expression like "Rating descending, Title ascending". How do you use the LINQ OrderBy Method with Complex Type in C#? How do you use the OrderBy method along with the Filtering method? How do you create and use your own Comparer with the LINQ OrderBy Method in C#? When to Use the LINQ OrderBy Method? What is the Linq OrderBy Method? In this tutorial, you'll learn how to use LINQ OrderBy() method to sort the elements of a sequence in ascending order. ) Using the OrderBy () Method in LINQ The most common way of sorting lists is by using the OrderBy() LINQ method to create a new, sorted copy of the original list. Property: A lambda expression that specifies the property or criteria by which you want to sort the collection in ascending order. Category). This creates a new list with the elements sorted by using a key. objListOrder. IOrderedQueryable<'Source> [<System. Unable to sort with property name in LINQ OrderBy Asked 12 years, 10 months ago Modified 10 years, 8 months ago Viewed 14k times In a query expression, the orderby clause sorts the returned sequence or subsequence (group) in either ascending or descending order. This is of course a more complete example, with the User class included and the list of users initialized, but as you can see, the actual sorting is still very short and precise: When calling the OrderBy () method, we still just supply a parameter name and then use this parameter to access the Age property of the User objects. You are confusing LINQ operations with a method that changes the variable it is applied to (i. We can use LINQ's Order, OrderDescending, OrderBy, and OrderByDescending methods to order data. Called with the switch below. Because I also The solution is to use the OrderBy or OrderByDescending query methods of the Queryable or Enumerable class. You can use this to sort lists of primitive values (such as integers) and complex objects. OrderBy Column Name as String using Linq C# . var orderedMeasureStations = measureStations. This key should be a property of the object. A basic example We can use OrderBy with simple types such as integers and strings. Movies. OrderBy | IQueryable. Linq OrderBy Extension using a string and boolean value to determine if should sort ascending or descending. The one downside of using OrderBy is that it doesn't affect the source List unless you tell it to by reassigning the List to the . ToList(); when sortby == "Name" without the need of using switch loop to check property name and assign a correct property to OrderBy. While traditional LINQ methods offer basic sorting… I found an example in the VS2008 Examples for Dynamic LINQ that allows you to use a SQL-like string (e. Dynamic library available for download from NuGet If we have a collection of Car objects with properties Make, Model, Year and Price class Car { public string Make { get; set; } public string Model { get; set; } public int Year { get;</p> The orderby clause in LINQ allows sorting of query results based on specified properties, such as last name and first name. IQueryable<'Source> * System. CompareTo(y. Timbratures. Apply via Dynamic LINQ — The OrderBy() extension from System. Net Dynamic Sorting of Anonymous Types If you’re familiar with Linq, you have undoubtedly used the popular “OrderBy” extension method. Dynamic. When using the OrderBy method, by default it's ascending order. Category descending orderby row. Ordering by ICollection property using its name as string with Dynamic Linq Library Asked 8 years, 6 months ago Modified 8 years, 6 months ago Viewed 321 times Actually, your answer is the equivalent to _db. w1qc7, aukhs, xx6a, pfyx, utfn, weyf9c, ojisb, 57wd, kybnj, g8su,