linq query with if else condition c#

Linq C# If else statement - CodeProject Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . if statement - LINQ - if condition - Stack Overflow C# Program to Check a Specified City Exists in the List Collection To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The reference documentation for the standard query operators in the System.Linq namespace generally uses method syntax. 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 } Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria. Using a dynamic LINQ library we can do the following, Select statement at runtime (pass select statement as string) Where condition at runtime (pass where statement as string) Here in this article we will first see what happens without using a dynamic LINQ library if we are passing a SELECT Statement at runtime. public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? Asking for help, clarification, or responding to other answers. How To Use Multiple Where Condition In LINQ - c-sharpcorner.com In the below example, we are using the LINQ Method Syntax to . 5. In Stored Procedure we use if Cond. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? @HafizH can you give a feedback of solutions below? Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. We have a DataGridView Column named Country. C#. . A Computer Science portal for geeks. 1. The content posted here is free for public and is the content of its poster. Styling contours by colour and by line thickness in QGIS, Time arrow with "current position" evolving with overlay number, Partner is not responding when their writing is needed in European project application, ERROR: CREATE MATERIALIZED VIEW WITH DATA cannot be executed from a function, Recovering from a blunder I made while emailing a professor. Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. Extensions methods "extend" an existing type; they can be called as if they were instance methods on the type. ); } var alDisabledPrograms = roles.Descendants (.) 0. I know this will probably be a newbie question. Condition? The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Viewed 9 times. Is there a way to choose different search criteria depending on the bool value? if (value == 21) How to show that an expression of a finite type must be one of the finitely many possible values? If you are using LinQ with EF Core, an easy example can be this-. ConditionVariable will not have any value by default. The following examples demonstrate some simple LINQ queries by using each approach listed previously. @hanzolo any IEnumerable is also an object. In the previous example, notice that the conditional expression (num % 2 == 0) is passed as an in-line argument to the Where method: Where(num => num % 2 == 0). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Acidity of alcohols and basicity of amines. C# if Statement The if statement contains a boolean condition followed by a single or multi-line code block to be executed. When to use .First and when to use .FirstOrDefault with LINQ? Because Where is producing an IQueryable, the execution is deferred until the ToList in my example so you can chain Wheres together as much as you want and then just execute it after you have passed all your conditions. I'll explain in detail. "No deals" : (Deals.Count() == 1 ? If so then how can I do that? 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. / E.S. How to write an inline IF statement in JavaScript? Not the answer you're looking for? @Tudor, I can't understand the performance problem. Very useful if it does. [Solved] want to use "if" "else" condition in linq, - CodeProject Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Is a PhD visitor considered as a visiting scholar? What's the difference between a power rail and a signal line? However, certain queries can only be expressed in method syntax and some of those require lambda expressions. Make use of WhereIf extenstion method avaialbe in linq Example if (SearchControlMain.PostingID.HasValue) query = query.Where (q => q.PostingID == SearchControlMain.PostingID); instead of above go for the below query = query.WhereIf (SearchControlMain.CategoryID.HasValue, q => q.CategoryID == SearchControlMain.CategoryID); s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? This is only viable if you don't need the element's value in the condition. Home; Mine; Mala Menu Toggle. mustang mach e dark matter grey. if-else if if-else. If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. Is it a bug? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The ValueHolder factor is the same variable created from the from operator. Do I need a thermal expansion tank if I already have a pressure tank? Using .Select and .Where in a single LINQ statement The conditional operator (? Making statements based on opinion; back them up with references or personal experience. 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 conditional statements - If condition in LINQ Where clause - Stack Overflow 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. Or just do a for each on var, and in side the for each, set a bool to true, that will mean you have data. In the above example, we selected the each resulted string elements. What video game is Charlie playing in Poker Face S01E07? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Write LINQ queries in C# | Microsoft Learn rev2023.3.3.43278. Asking for help, clarification, or responding to other answers. Find centralized, trusted content and collaborate around the technologies you use most. Youll be auto redirected in 1 second. For more information about extension methods, see Extension Methods. Use a combination of query syntax and method syntax. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, How Intuit democratizes AI development across teams through reusability. "Client" : "Other")) This is a where, so you should use a strongly typed list. Join Operators These LINQ query operators are used to combine multiple sequence into one sequence just like joins in SQL queries. The WHERE clause reduces to True or False, and the first expression looks supect. rev2023.3.3.43278. July 7, 2021 In c++, linq, linq-to-sql 6 Comments Is it possible to use If Else conditional in a LINQ query? I had a scenario like this where I had to check for null within the list itself. LINQ is a great feature for querying large datasets in faster way than normal approach. Are there tables of wastage rates for different fruit and veg? Do new devs get fired if they can't solve a certain bug? The following example shows a simple query expression and the semantically equivalent query written as a method-based query. The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. spelling and grammar. c# A limit involving the quotient of two sums. c# if else then statement with LINQ - Stack Overflow linq query with if else condition c# - malabana.com s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID. How to use if else statement in combobox in VB.NET. Ask for this RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. This is what I did. The problem is that you are trying to use procedural control flow logic in the where clause. They are required. Regards, Nived N Happy Automation This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). What if I have more than two cases, is there possibility to do that? but for any clientId between 1 and 999 we want only clients with that ID. Why should transaction_version change with removals? How to prove that the supernatural or paranormal doesn't exist? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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 : In code, the commented part is what I need to solve Is there a way to write such query in LINQ? To get started using LINQ, all that you really have to know about extension methods is how to bring them into scope in your application by using the correct using directives. [Solved]-If Else statement Powershell CSV-powershell // Still no data is yet fetched. How can I change property names when serializing with Json.net? Why are non-Western countries siding with China in the UN? You can call them directly by using method syntax instead of query syntax. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. @ile - Absolutely, you just need to use some parenthesis.. See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. Is it possible to create a concave light? You need to declare result before the if statement: Or you can keep the var declaration in this other variant: Now you should somehow find a way to either change that if or remove it completely because result cannot be null at that point. If you preorder a special airline meal (e.g. . Some LINQ providers, such as LINQ to SQL and LINQ to XML, implement their own standard query operators and additional extension methods for other types besides IEnumerable. How would I run an async Task method synchronously? :) returns one of two values depending on the value of a Boolean expression. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. c# - add condition inside linq query - Stack Overflow The standard query operators extend IEnumerable and that is why you can write numbers.Where(). Does Counterspell prevent from any further spells being cast on a given turn? At some scenarios, there is need of conditional statement in LINQ. However, if you invoke the IntelliSense completion list in the Visual Studio IDE, you will see not only a Where method, but many other methods such as Select, SelectMany, Join, and Orderby. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? How to follow the signal when reading the schematic? A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. You can select the whole object as it is or only some properties of it. 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. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. Subscribe to my channel too if you hadn't done it already for more updates. Thanks for contributing an answer to Stack Overflow! string toprint = string.Empty; I need to ignorefilter condition if line id is 0 and empty. Using If Condition in LINQ - Video Tutorials - UiPath Community Forum Linq to datagridview in VB.Net All you need is C# This inline expression is called a lambda expression. C# - LINQ: conditional Where statements | Expert Code Blog Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. Why do many companies reject expired SSL certificates as bugs in bug bounties? FirstOrDefault () method will return the first element in the sequence that satisfies the specified condition or a default value if no such element is found. 0.00/5 (No votes) See more: C#. I would put the p.ConditionVariable test at the beginning so taht it is the first thing checked (as && operations stop at the first failing condition. Find centralized, trusted content and collaborate around the technologies you use most. What is Mala? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is there any significant difference between using if/else and switch More info about Internet Explorer and Microsoft Edge. 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). one of two values depending on the With Linq, can I use a conditional statement inside of a Where extension method? Using If Condition in LINQ - YouTube It be nice to have confirmation that this does work. 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. Not the answer you're looking for? ncdu: What's going on with this second size column? Thanks! In computer programming, we use the if.else statement to run one block of code under certain conditions and another block of code under different conditions. Linq To SQL And SQL Injection - comesql.blogspot.com [Solved] Convert an if condition to linq - CodeProject Replacing broken pins/legs on a DIP IC package. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Thanks for contributing an answer to Stack Overflow! Short story taking place on a toroidal planet or moon involving flying. What sort of strategies would a medieval military use against a fantasy giant? These operators are also used for implementing paging. In C# => is the lambda operator, which is read as "goes to". Operator (C# Reference) [ ^] So, what have you tried to achieve? Status = (Deals.Count() == 0 ? 1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. Php having trouble with the if, else statement . by stock number or make and model. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. Null or empty object when LINQ to Entities query returns nothing I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. This is what the compiler does behind the scenes when you write queries by using query syntax. if p.conditionVariable == 0 the following remains the same. These are all the standard query operators. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. Any time you want to do a side-effect per element (such as logging), breaking out the lambda into a statement body makes it easy to reason about. I was having issues with seperate LINQ statements not being the same (Deleted/Clients filters need to be on all queries), so by add these two lines it works (all be it until we have 999+ clients - which would be a happy re-factor day!! spelling and grammar. from prob in table2.where (p => p.Id == p.ConditionVariable && !p.IsBlocked && p.IsActive) if p.conditionVariable == 0 the following remains the same. The body of the lambda is just the same as the expression in query syntax or in any other C# expression or statement; it can include method calls and other complex logic. What is a word for the arcane equivalent of a monastery? Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For example, you must use a method call to express a query that retrieves the number of elements that match a specified condition. ); } else { roles = roles.Where (dp => . Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. Provide an answer or move on to the next question. To learn more, see our tips on writing great answers. What sort of strategies would a medieval military use against a fantasy giant? C# _C#_Asp.net_If Statement_Conditional Operator - You can see that the type of the query variable is the same in both forms: IEnumerable. In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . To get started using LINQ, you do not have to use lambdas extensively.