linq query with if else condition c#

Not sure if this is appropriate but it is quite useful, you can use ifs quite handily with conditional where clauses: So the where clause will be amended according to what is in UUF1 or UUF2 i.e. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. Connect and share knowledge within a single location that is structured and easy to search. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. code - block - 1 : code - block - 2. from prob in table2.where (p => p.Id == p.ConditionVariable && !p.IsBlocked && p.IsActive) if p.conditionVariable == 0 the following remains the same. The ValueHolder factor is the same variable created from the from operator. Short story taking place on a toroidal planet or moon involving flying. Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . The site does not provide any warranties for the posted content. Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. not an object? rev2023.3.3.43278. Means it is mostly used in querying purpose like fetch largest value from an array. Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. Although it looks as if IEnumerable has been redefined to include these additional methods, in fact this is not the case. All you need is C# Not the answer you're looking for? Bulk update symbol size units from mm to map units in rule-based symbology, Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers). Is it possible to use If Else conditional in a LINQ query? If so then how can I do that? Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. Using a conditional if statement in a Linq query; Case Statement In linq query on where condition using c#; LINQ statement using Orderby and Distinct in sub query; How to avoid Query Plan re-compilation when using IEnumerable.Contains in Entity Framework LINQ queries? Is there a single-word adjective for "having exceptionally strong moral principles"? All LINQ query operations consist of three distinct actions: Obtain the data source. Thoughts? from dbo. Why should transaction_version change with removals? A Computer Science portal for geeks. The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. Hello, yes you can use LINQ to query data in a DataGridView. Why do small African island nations perform better than African continental nations, considering democracy and human development? ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. . LINQ In sql I use like this: Classcud2 ob1 = new Classcud2 ( "select * from tbl_usertotalrating where store_name='" + TxtCompany.Text + "'" ); if (ob1.ds.Tables [0].Rows.Count > 0 ) { // what i want } else { // what i want } but my problem is I want to use "if" "else" condition in linq, In linq : Does Counterspell prevent from any further spells being cast on a given turn? In the above syntax, a condition is an expression. The Select clause is used to shape the data. Subscribe to my channel too if you hadn't done it already for more updates. LINQ query syntax always ends with a Select or Group clause. A place where magic is studied and practiced? Later in the code, I want to loop through the object (alDisabledPrograms). You can perform the where separately from the main query: You need to declare the result variable before the first if-else. What is Mala? if (condition) { query = query.Where (b => b == "something else"); } You can use the WhereIf statement method avaialbe in LINQ in this way: query = query.WhereIf (condition, b => b == "something else"); So your final code will be: When to use multiple where clauses in LINQ? The content posted here is free for public and is the content of its poster. In C# => is the lambda operator, which is read as "goes to". If it has any value then I need to search the id which is equal to conditionvariable in table2. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Chances are they have and don't get it. I'm not sure what the question is, but a possible answer could be: It would be a complicated way of saying something simple, though. Why are trials on "Law & Order" in the New York Supreme Court? "Prospect" : (deals.Count () == 1 ? The standard query operators extend IEnumerable and that is why you can write numbers.Where(). :" is translated to a "case" expression and there are subqueries. You can perform the where separately from the main query: var result = from dm in datacontext.Trk select dm; if (intval == 0) { result = result.Where (dm => dm.ID == 0); } else { result = result.Where (dm => dm.ID != 0); } if (result.Any ()) { // do something } Share Follow answered Jan 20, 2012 at 22:52 Chris Dunaway 10.8k 4 35 47 ncdu: What's going on with this second size column? dateFrom, DateTimeOffset? Using .Select and .Where in a single LINQ statement @value= TotalBookingPrice To nest a conditional query, you can write the in place of the list of the outside query. How to prove that the supernatural or paranormal doesn't exist? //queryAllCustomers is an IEnumerable<Customer> var queryAllCustomers = from cust in customers select cust; The range variable is like the iteration variable in a foreach loop except that no actual iteration . Check this example. Is it possible to create a concave light? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. The "return value" is just the expression result. Something like from p in db.products if p.price>0 select new { Owner=from q in db.Users select q.Name } else select new { Owner = from r in db.ExternalUsers select r.Name } A Computer Science portal for geeks. Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. What sort of strategies would a medieval military use against a fantasy giant? switch-case can only compare values that can be used in a switch statement, such as integers and characters, while if/else can use any Boolean expression. In general, the rule is to use (1) whenever possible, and use (2) and (3 . Asking for help, clarification, or responding to other answers. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Styling contours by colour and by line thickness in QGIS, Theoretically Correct vs Practical Notation, Topological invariance of rational Pontrjagin classes for non-compact spaces, Time arrow with "current position" evolving with overlay number. Don't tell someone to read the manual. If the data source contains the specified element, then it returns true else returns false. The variable is limited to the block it is declared in. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Where is not producing IQueryable, it is producing IEnumerable. Is it correct to use "the" before "materials used in making buildings are"? The WHERE clause reduces to True or False, and the first expression looks supect. Autor de l'entrada Per ; Data de l'entrada ice detention center colorado; https nhs vc hh cardiac surgery a linq query with if else condition c# a linq query with if else condition c# This condition is generally expressed using lambda expression. We have specified two where conditions in both linq and lambda queries. All you need is: If clientId = 0 we want ALL employees,. Thanks for contributing an answer to Stack Overflow! . Making statements based on opinion; back them up with references or personal experience. Is your question about building the expression-tree without the arg-names or anything different I did not catch? At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. Asking for help, clarification, or responding to other answers. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. To get started using LINQ, you do not have to use lambdas extensively. Is it possible to create a concave light? Php if else statement autamaticaly goes to else part. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! Why is this sentence from The Great Gatsby grammatical? You can assign the IEnumerable to an object reference, but once it's there, you can't do much of value with it; you can't enumerate it or call any linq methods on it without casting it back to IEnumerable. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. Since we have determined that a LINQ statement produces an Enumerable list, if you don't need the list itself, you can declare a variable that is the type returned by a method, put the statement in parentheses, and then access the method outside the . IF ELSE condition in Linq Where clause using C# and VB.Net in ASP.Net sureshMGR on Jan 29, 2021 12:07 AM Sample_180542.zip 13435 Views Answered Hi friends, I need to reduce source code by removing below if conditions, how to filter data in same query without using if condition? { toprint = "Below"; } You need to understand that what's in the WEHRE clause is a boolean expression not a statement. if (value == 21) It'll be interesting to see if that works if it does, I'd love to see the TSQL (assuming it does eager loading; for lazy loading, probably not too terrible). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 1. This applies the condition3 only if condition2 is false. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. When to use .First and when to use .FirstOrDefault with LINQ? About an argument in Famine, Affluence and Morality.

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