Lambda orderby string. The code then looks something .

Lambda orderby string The code below works fine for a sortOn value like "Code" generating the lambda . string sortBy Is it possible with C# to pass a lambda expression as an IComparer argument in a method call? eg something like var x = someIEnumerable. Name) . 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. Like so the order I would want this in as. By combining lambda expressions with OrderBy, you can specify the sorting criteria with ease. Dec 19, 2017 · I use it for pass string parameter in it. Reflection? Logically, this is what I'd like to do: query = query. which denotes a delegate that is pretty much a pointer to a method, i. OrderBy(item => item. Feb 7, 2014 · I would like to Group by and then order the items within the group. I am not sure if I need to change this to use some compare function or something. In this case the Func operates on a Person type (T) and the TResult will be a string since Name is a string and is what you are sorting by. Aug 6, 2010 · IEnumerable<string> orderedByLength = from string x in test orderby x. Defining a ConvertableExpression class so we can intercept calls to our custom OrderBy():. I don't find the right syntax for Expression<Func<>> to use with the dictionary (as TValue type) Mar 5, 2018 · // Build some List you want to sort List<string> myList = new List<string>() { "3", "1", "2" }; // Sort the List myList = myList. Direction == SortDirection. ToList(); I have nodeList as List(of Objects) each having a List(of String) I was thinking that the below line of code would yield the correct sorting. . Here we use the LINQ orderby keyword to sort a List by any property. Code But I would also like to sort on a child entity, where the lambda might be Oct 16, 2012 · I have a List of Strings which are the names of records. Count) I want to reorder my nodeList in descending order by the List(of String). Select(x=>x); Oct 14, 2009 · I have a List<BuildingStatus> called buildingStatus. OrderBy(film => film. Deferred Execution: Just like OrderBy, the sorting operation is deferred until you actually use the sorted collection. Apr 2, 2020 · A better way to do dynamic OrderBy() in C#. private static LambdaExpression GenerateSelector<TEntity>(String propertyName, out Type resultType) where TEntity : class { // Create a parameter to pass into the Lambda expression (Entity => Entity. ToList(); remove any CLR method so ORM can transform it to a known SQL query Aug 16, 2012 · I am trying to build a generic query mechanism to access my repository. In other words, the Dictio Aug 2, 2012 · Edit: Since you are accepting user input, here's what I mean by mapping:. a compiled piece of code. 5. SortField. The main thing here is to give you an idea of how to chain OrderBy/ThenBy programmatically, rather than trying, unsuccessfully, to chain individual member expressions, which requires a lot more work (you'd need to build your own tie-breaking logic), and is not guaranteed to succeed at Jul 4, 2013 · I have this sql statement : SELECT QuestionNo, ActivityID, GROUP_CONCAT(CONCAT(Question, ' [', Answer, ']') SEPARATOR ' ') AS joined from question GROUP BY QuestionNo, ActivityID OrderBy Sep 19, 2012 · You may use reflection in an extension method which allows for linq syntax: public static IQueryable<TSource> OrderBy<TSource>(this IQueryable<TSource> source, string field, string direction) { string orderByMethod = (direction == "ASC") ? Now I have so far this orderby for my linq. How do I go about sorting a list of objects in alphabetical order by a string property. Nov 19, 2013 · var edates= edates. Replace("-count=1", string. Jul 18, 2012 · So you must change List<string> t into ref List<string> t in your method. Generic; using System. ToList(); // This will order the films first by Year in descending order and // then by Name in ascending order. The problem is that it can't handle complex properties related entities such as "ComplexProperty. OrderBy) method, I need a lambda expression that will result in the above numbers being ordered from lowest positive number and then from lowest negative number, so the output would be this: Jun 29, 2015 · It is trying to resolve your OrderBy to the Dynamic Linq "version" of OrderBy, that accepts a string as a parameter. id 2 id 1 So endDates that are greater go first. OrderBy, like: Sep 15, 2017 · Actually you can use LINQ for sorting elements on any type that implements IEnumerable<T> interface like List<T> type: // This will order the films by their name. If that's okay, then you want something like:. Sort is going to be more efficient. I want to convert the code below(ASP) to C#. But inside this extension the string will be parsed to Lambda. Nov 21, 2008 · I've extended your functions to add support for Child Properties. Func<string, int> getNum = str => int. Sep 10, 2015 · I need to sort a query by string and found this that works well. Lambda expressions also allow for more complex sorting scenarios where custom logic is required. Expression = expr; } public Expression<Func<T, object>> Expression { get; private set; } } Apr 4, 2014 · Passed as a lambda so that it can be lazy evaluated. Sep 1, 2011 · System. Collections. var sorted = array. Mapper: If a list uses an array as a backing store (common, but not required), a sort routine that accesses array elements directly can be much faster than one which has to go through the IList<T> interface to access every element. Clear(); t. var result2 = films . RfidTags. ToDouble(a)); The Lambda-Expression in OrderBy needs to select a value which will be ordered in default manner. Linq. OrderBy(e => e. In this tutorial, you'll learn how to use LINQ OrderBy() method to sort the elements of a sequence in ascending order. Length select x; EDIT: Now that the question has been clarified, the query expression form is: var query = from value in collection orderby value. OrderBy(a => Convert. function getTestimonialList(statusCd) sWhere = "" if statusCd &lt;&gt; "" Mar 7, 2009 · To be clear, OrderBy won't sort the array in place - it will return a new sequence which is a sorted copy of the array. ThenBy(p => p. Each object in each List has a property value which is equal to that List's associated key. DataSource = dataFromDB. Reverse(); so it is only done once at object creation. net. sort first by whether sortfield has a value, then by sortfield asc or sortfield desc May 25, 2015 · The GroupBy method suits your requirement perfectly. dbContext. Feb 23, 2016 · option 1 : this can done using expression : check this sample. "ProductId"); Jun 30, 2015 · Linq/Lambda OrderBy Delegate for List<string> of IP Addresses. Simply pass a Func<TSource, TKey> in the form of a lambda-expression. I will need to use Lambda/Linq to sort the list of objects. Jan 28, 2014 · If you're unable to change your table definition (so the version is a numeric type), and your query really is as listed (your not using skip, or take, or otherwise reducing the number of results), the best you can do is call "ToList" on the unsorted results, which when you then apply an OrderBY lambda to it will take place in your code, rather than trying to do it at the SQL Server end (and Feb 6, 2014 · Use this extension method: public static IQueryable<TEntity> OrderBy<TEntity>(this IQueryable<TEntity> source, string orderByProperty, bool desc) { string command = desc ? What I'm really curious about is if the same can be accomplished using the Lambda based extension methods off of generic IEnumerable to accomplish the same thing. ThenBy(film I want to sort it and bind it to a control based on a numerical ID. The Lambda-Expression will be run for every item in your list. OrderBy is actually just an extension method on IEnumerable defined as Sep 19, 2012 · Here's the method I use for this: private IQueryable<T> OrderQuery<T>(IQueryable<T> query, OrderParameter orderBy) { string orderMethodName = orderBy. Dynamic allows us to set string value in OrderBy method. OrderBy Scenario: Sorting a List of Students by Their Grades Oct 25, 2016 · I have not tried compiling this, so you may need to make a few adjustments to the code before it compiles. HasValue). Sort((x, y) => getNum(x). Based on the value of this parameter, I'd like get back an expression to use with an OrderBy. Count. EF for dynamic access and query compilation. Select(c => c. nodeList. The code reads like a natural language description of the sorting Oct 28, 2009 · This only works in situations where you have a numeric field, but you can put a minus sign in front of the field name like so: reportingNameGroups = reportingNameGroups. However, you can do it explicitly with extension methods:. AddRange(u); will work. Explore Teams @O. OrderBy(x => x). SomeProperty descending select value; Sep 29, 2016 · I tried OrderBy(x => x) with the test data that you provided, and that produces exactly the output that you want. string sortBy = "StatusID"; return dbContext. A group is a collection with a key (in this case, a name). Requests. p => p. public class GroupedRow { public int id { get; set; } public string label { get; set; } public decimal SumO Mar 30, 2020 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. ) List<MyObject> orderedList = unorderedList. Bar}) . OrderByField(sortBy,true) But how i can orderBy with a dynamic string parameter with column related with request table like. Please add dynamic-linq tag and update the question accordingly. Inside it, convert the string to an TicketStatusOrdered enum which is in the order you want. Status. Split(Separator, StringSplitOptions. Ask Question Asked 13 years, 10 months ago. For recording purposes, I do not delete the String Jul 31, 2009 · The OrderBy clause below works correctly for ordering (as if string data), but I actually want to treat the values as DateTimes, and perform the sort by Date. If you cannot use ref, I guess something like var u = t. Ex: public class Employee { public string FirstName {set; get;} public string Jul 23, 2024 · The OrderBy method in LINQ allows you to sort elements of a sequence based on a key. If it's an array that you have from start, you can just use the Array. Ascending ? Aug 8, 2023 · Output: Similar to OrderBy, the operator returns a new collection containing the sorted elements. Replace("-count=2", string. R. OrderBy(aClass e =&gt; e. 1. OrderBy(x => x. class CustomSorter { static Dictionary<string, Func<IMyClass, object>> Selectors; static Apr 21, 2015 · I can't understand why this code won't order my list of data by string name. Hot Network Questions Outlet Wiring Gone Wrong Apr 2, 2020 · The reason the above won’t work is that the lambda expressions get types Func<string, DateTime> and Func<string, string> etc. If instead you want the same list to be sorted, maybe try something like this:. Parse(o. OrderByDescending(p => p. You can use the EF. OrderBy(t => t. ToList(); Sep 1, 2023 · Orderby query. ToArray(); I'm not sure what you are referring to when you said that you have to implement some interfaces, but you do not have to do this when using the IEnumerable. someProperty, (aClass x, aClass y May 7, 2023 · 报错信息 "无法解析方法 'orderBy(boolean, boolean, String)" 就是这个方法的第三个参数是不支持字符串的，但是呢，我不想硬编码 Oct 5, 2013 · I am using a LINQ lambda expression like so: int Value = 1; qryContent objContentLine; using (Entities db = new Entities()) { objContentLine = (from q in db. This makes it simple to sort based on string length, or a property value in any object type. // Example of sorting a list of integers in ascending order List<int> numbers = new List<int> { 5, 2, 8, 1, 9 }; var sortedNumbers = numbers. StringHoldingAnInt)); Nov 22, 2012 · The other answers create a new list which is sorted the way you want. Custom Sorting with Lambda Expressions. The problem is that the API stores the number in a string field instead of as an int and Linq barfs on the conversion attempt. Modified 9 years, 5 months ago. Details. Fullname), then you'll have to dive into the sea of generics and extension methods. However, a correct use of t. I have tried implementing IComparable on the property but I only figured out how to sort on the first character (using char). I'd like to check whether it contains a status whose char code (returned by GetCharCode()) equals some variable, v. Is there a way to use that string directly as a property of the linq query, without having to use conditional logic (if/else, switch) to map the strings to properties. Sort method: So I have a Dictionary with string keys, and the value is a List of objects. Apr 29, 2012 · I'm using LINQ to SQL and LINQ dynamic where and order by. EDIT: OK, I see you simply inherit this issue in unchanged form from the question. So I thought it would work if we will parse Lambda to string and give it to OrderBy method. Viewed 10k times Oct 7, 2016 · When using a Lambda Expression to perform an OrderBy on a generic collection, integer properties cause an exception 92 How do I apply OrderBy on an IQueryable using a string column name within a generic extension method? May 13, 2011 · What about: var orderedListOfRfidTags = uow. Length). I have the name of the "sort by property" in a string. I am struggling to find a way to pass a list of generic Lambda Jul 22, 2011 · Sorting a list using Lambda/Linq to objects C# List<> OrderBy Alphabetical Order. OrderBy( s => s ). Jun 27, 2016 · I guess by "string version" you mean the so called "Dynamic LINQ" (or System. Reverse(); - do not work in # using System. You can order the grouping and then flatten out your collection using SelectMany: They will choose the "order by" property in the UI - as a string value of course. public class ConvertableExpression<T> { public ConvertableExpression(Expression<Func<T, object>> expr) { this. Dynamic; or if you rewrite the statement to force using Queryable. Real Scenario of OrderBy and OrderByDescending. ToList(); t. Empty). OrderBy(x => new {x. Fields["FieldName"]. OrderBy(x=> - x. ToList(); I want to order it however also using the end date. A lambda expression is created to access the specified property from the source Jul 23, 2024 · In the above code snippets, we are using lambda expressions to define the sorting criteria for the OrderBy and ThenBy methods, resulting in sorted collections based on specific properties. how do i do it with lamda, using System; using System. OrderByDescending(Function(x) x. An example: Record_One Record_Two Records_Three Sometimes, I want to delete a record. Property method to sort the queryable by the property names or even shadow properties. Dynamic). C# -> string. qryContents Sep 30, 2010 · public class Person { public int Id { get; set; } public string Name { get; set; } } Now you want to preserve a sort order that sorts by the Name property. I thought wrong. In general, a more correct error, and the one you get if you remove the using System. OrderByDescending(film => film. None)[4]); list_lines. – Ivan Stoev Jul 1, 2014 · Here's my solution (using Reflection and based on DynamicLinq ideas):. And it works! Jul 13, 2012 · I'm trying to generate a LINQ OrderBy clause using lambda expressions with an input of the column name of an entity as a string (in the "sortOn" variable below). Name == sortColumn). 2. var hold = MyList. EntityFrameworkCore. EDIT: Here is some sample code. OrderBy(s => s. Create an OrderBy Expression for LINQ/Lambda. Oct 1, 2017 · The method MyMethod as a string parameter. Year) . Foo, x. Linq; using System. GroupNodeId); Aug 12, 2015 · For those who are looking for a solution in EF Core: There is a set of functions available in Microsoft. e. If you want to create a method that works like OrderBy, besides that your GetPropertyValues seems to be the same as customers. If you make it static (in this case, no reason it couldn't be), then it will be done when the class is loaded and only that once. OrderByField). SortField) //i. Property" s May 15, 2010 · You basically can't use query expressions like this, due to the way they're translated. Google tells me I can do something like the following to accomplish it: var resultSet = foobarList. Value). Feb 4, 2015 · Create lambda expression for OrderBy based on string. the key advantages of using these operators: Simplicity and Readability: The `OrderBy` and `OrderByDescending` operators provide a simple and intuitive way to sort data. ToList(); I know that a simple class with properties can do the trick but doing that so would need to change other methods which would require a lot of work. Sep 15, 2015 · I have a list of MyClass and one of its properties is Position. OrderBy(p => p. myControl. OrderBy. An implementation might take a string or enum for the column plus a bool or enum for ascending vs. CompareTo(getNum(y))); Jul 20, 2009 · Create lambda expression for OrderBy based on string. public static IQueryable<T> OrderByPropertyOrField<T>(this IQueryable<T> queryable, string propertyOrFieldName, bool ascending = true) { var elementType = typeof (T); var orderByMethodName = ascending ? Nov 15, 2018 · Use a single OrderBy. Parse(str. Property""RelatedEntity. I wish to use Lambda expressions to filter and sort the query. Value); You could reverse the preferences in the initialization new string[] { "A", "B", "C" }. Number). (The sortColumn would be something like "dateCreated". The code then looks something Aug 8, 2023 · The `OrderBy` and `OrderByDescending` operators offer several advantages for sorting data within collections. Initially, the positions could be like this: 2,-3,1,3,4,5,-2,-1, Using the Sort (NOT . var result1 = films . descending. Empty)). Feb 27, 2024 · The OrderByColumn value determines the appropriate sorting method ("OrderBy" for asc, "OrderByDescending" for desc). Find(s => s. StartDate). Text; namespace Jan 14, 2011 · myStringArray = myStringArray. LINQ OrderBy with IEnumerable<T> key. Description) Nov 28, 2012 · This answer is perhaps what you were originally looking for - using your generic extension method: public static IQueryable<T> OrderByFieldNullsLast<T>(this IQueryable<T> q, string SortField, bool Ascending) { //We are rebuilding . OrderBy(o => int. Linq; 1. uekz fyl gbosw ojgqcp ijkcxat ncoghkq zqyway ayvl fna krmfxi