linq query with if else condition c# linq query with if else condition c#

Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How Intuit democratizes AI development across teams through reusability. if-else if if-else. Query Syntax and Method Syntax in LINQ (C#) | Microsoft Learn What if I have more than two cases, is there possibility to do that? Edit: You can make combinations like this: Status = (deals.Count () == 0 ? Connect and share knowledge within a single location that is structured and easy to search. if (value <= 12) 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. 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. You're welcome to try, of course Answer above is not suitable for complicate Linq expression. SingleOrDefault () method will return the only element in the sequence that . 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). This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). This is only viable if you don't need the element's value in the condition. Understand that English isn't everyone's first language so be lenient of bad 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); I have a scenario where table2 has a column called ConditionVariable and id. 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? To understand the method-based query, let's examine it more closely. The content must be between 30 and 50000 characters. Should isn't does. Using LINQ Method Syntax, it is a little difficult to write the join query when joining more than two data sources. Because queries return an IEnumerable, you compose them in method syntax by chaining the method calls together. However, certain queries can only be expressed in method syntax and some of those require lambda expressions. A limit involving the quotient of two sums. Is it possible to create a concave light? Youll be auto redirected in 1 second. A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. Download FREE API for Word, Excel and PDF in ASP.Net: This site is started with intent to serve the ASP.Net Community by providing forums (question-answer) site where people can help each other. rev2023.3.3.43278. The content posted here is free for public and is the content of its poster. one of two values depending on the ncdu: What's going on with this second size column? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Null or empty object when LINQ to Entities query returns nothing 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# Isn't the result of a LINQ query an IEnumerable<>? Each { } gets its own scope. not an object? Using If Condition in LINQ - Video Tutorials - UiPath Community Forum The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. @ile - Absolutely, you just need to use some parenthesis.. 1. It is a convenient way to write code that would otherwise have to be written in more cumbersome form as an anonymous method or a generic delegate or an expression tree. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. Powershell Or Python3 - CSV file: remove row based on duplicates in a column, with IF ELSE based conditions in another column; else statement issue powershell script; Use method syntax. @Tudor, I can't understand the performance problem. Viewed 9 times. You need to define the variable out of blocks, but then you need to be specific about the type, because C# compiler needs direct assignment expression to infer the type for var keyword. How do particle accelerators like the LHC bend beams of particles? How to implement is functionality without using is keyword in C# LINQ Query Operators - LINQ Tutorials - DotNetPattern.com Acidity of alcohols and basicity of amines. Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. What video game is Charlie playing in Poker Face S01E07? return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Status = (Deals.Count() == 0 ? This is a where, so you should use a strongly typed list. @value= TotalBookingPrice LINQ's Distinct() on a particular property. If Else in LINQ - TechTalk7 If Else and Elseif Condition in linq - UiPath Community Forum Is a collection of years plural or singular? Say I have a LINQ query like this: application = CreditDatabase .Applications .Select (Mapper.Map<Application>) .Where (c => c.uID == urID) .DefaultIfEmpty ().First (); It returns null if the LINQ query returns an empty result set. Check this example. The WHERE clause reduces to True or False, and the first expression looks supect. These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. The problem is that you are trying to use procedural control flow logic in the where clause. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. Connect and share knowledge within a single location that is structured and easy to search. 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: // Original query var query = someList.Where (a => a == "something"); // Add additional where constraints with condition // using 'WhereIf' statement query = query.WhereIf (condition . Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. from dbo. Connect and share knowledge within a single location that is structured and easy to search. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Php if else statement autamaticaly goes to else part. Making statements based on opinion; back them up with references or personal experience. 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. Find centralized, trusted content and collaborate around the technologies you use most. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. How to show that an expression of a finite type must be one of the finitely many possible values? There are there Contains Methods available in C# and they are implemented in two different namespaces. Syntax. linq query with if else condition c# Is it suspicious or odd to stand by the gate of a GA airport watching the planes? In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. so, if 'someCondition' is false, 'Where' will be skipped. When to use .First and when to use .FirstOrDefault with LINQ? / E.S. I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. c# The conditional operator (? 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. Do you need your, CodeProject, So we should be getting this as output from both queries. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The region and polygon don't match. For a trivial example of the type of thing you can do: You can do much richer things, but I really doubt you can pick the table in the conditional. Select IF ELSE condition in Linq Where clause using C# and VB - ASPSnippets 1 solution Solution 1 You don't need LINQ or a ternary operator. I have no idea what you are asking, please clarify the question. If else condition in multiple from in LINQ in C# - Stack Overflow Please refer, IF ELSE condition in Linq Where clause using C# and VB.Net in ASP.Net, https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html. :) returns one of two values depending on the value of a Boolean expression. Linq C# If else statement - CodeProject By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Use a combination of query syntax and method syntax. There is a swigly line under the result in if (result!= null) saying that the name result does not exist in the current context. For more information about standard query operators, see Standard Query Operators Overview (C#). Optimizing Queries with LINQ . This video gives an idea on usage of If condition in LINQ through a simple scenario. Wrong answer. If you feel any content is violating any terms please, This site makes use of Cookies. { toprint = "Normal"; } The "return value" is just the expression result. Thanks! s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? These operators are also used for implementing paging. A Computer Science portal for geeks. Minimising the environmental effects of my dyson brain. 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). rev2023.3.3.43278. Is there a single-word adjective for "having exceptionally strong moral principles"? LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria, How to handle a hobby that makes income in US, Short story taking place on a toroidal planet or moon involving flying, Bulk update symbol size units from mm to map units in rule-based symbology. Why are non-Western countries siding with China in the UN? How to write an inline IF statement in JavaScript? Are there tables of wastage rates for different fruit and veg? 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Introduction to LINQ Queries (C#) | Microsoft Learn In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. I assume from db that this is LINQ-to-SQL / Entity Framework / similar (not LINQ-to-Objects); Generally, you do better with the conditional syntax ( a ? 0.00/5 (No votes) See more: C#. LINQ to SQL avoids such . LINQ queries can be applied for CRUD operations . IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? The Select clause is used to shape the data. Later in the code, I want to loop through the object (alDisabledPrograms). What is the correct way to screw wall and ceiling drywalls? How is LINQ to SQL protected from SQL-injection attacks? With Linq, can I use a conditional statement inside of a Where extension method? Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . rev2023.3.3.43278. Is it correct to use "the" before "materials used in making buildings are"? email is in use. 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. How to prove that the supernatural or paranormal doesn't exist? LINQ is a great feature for querying large datasets in faster way than normal approach. Why do many companies reject expired SSL certificates as bugs in bug bounties? Coding example for the question If Else statement Powershell CSV-powershell. Operator (C# Reference) [ ^] So, what have you tried to achieve? +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". If you preorder a special airline meal (e.g. Do new devs get fired if they can't solve a certain bug? How To Use Multiple Where Condition In LINQ - c-sharpcorner.com Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement The output from the two examples is identical. Acidity of alcohols and basicity of amines, Theoretically Correct vs Practical Notation. Find centralized, trusted content and collaborate around the technologies you use most. To nest a conditional query, you can write the in place of the list of the outside query. Making statements based on opinion; back them up with references or personal experience. Find centralized, trusted content and collaborate around the technologies you use most. Why do many companies reject expired SSL certificates as bugs in bug bounties? Not sure how to fix this. Asking for help, clarification, or responding to other answers. - Projection condition evaluating incorrectly - If condition not evaluating as expected ifelse - evaluating else if after an if condition is true MSBuild 3.5 - MSBuild 3.5 Property Functions in Condition msbuild 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. ? C# _C#_Asp.net_If Statement_Conditional Operator - [Solved]-Using if else statement in Linq Query-LINQ,C# We have a DataGridView Column named Country. you might have only UUF1 with info, in which case it will take that and ignore the UUF2 where clause, you might have both in which it will take both or you might not have anything in UUF1 or 2 and your where clause will just take the accountid as the where clause. c# - MsBuild StartsWith - MsBuild StartsWith not Evaluating In From your application's point of view, an extension method and a regular instance method are the same. What is Mala? Why should transaction_version change with removals? We can see there is just one income between 25000 and 40000. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. If you are using LinQ with EF Core, an easy example can be this- var orderedData = await _dbContext.ModelName .OrderBy (c => c.Name.Length.Length > 4 ? 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How can I change property names when serializing with Json.net? by stock number or make and model. 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. C# Program to Demonstrate the Use of the Method as a Condition in the LINQ Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! available from Rexburg Motor Sports in Rexburg, Idaho. How to show that an expression of a finite type must be one of the finitely many possible values? Provide an answer or move on to the next question. I know this will probably be a newbie question. Not the answer you're looking for? 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. Why are physically impossible and logically impossible concepts considered separate in terms of probability? You can select the whole object as it is or only some properties of it. How would I run an async Task method synchronously? What sort of strategies would a medieval military use against a fantasy giant? Users can follow the syntax below to use the inline if statement in JavaScript. dateTo, List<AccountRootType> accountRootTypes = null . / E.S. It be nice to have confirmation that this does work. If you want to use if/else conditions, you can use something like this. A place where magic is studied and practiced? : is nothing but if else else if else. Let me know if you need any help with this query. A Computer Science portal for geeks. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. This inline expression is called a lambda expression. When to use .First and when to use .FirstOrDefault with LINQ? I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. // Still no data is yet fetched. 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? c# - If Else in LINQ - Stack Overflow Linq to datagridview in VB.Net To learn more, see our tips on writing great answers. Is there any significant difference between using if/else and switch Using .Select and .Where in a single LINQ statement 5. s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID. When to use .First and when to use .FirstOrDefault with LINQ? Using Conditional C# LINQ Clauses to Make A Multiple-Input Search Engine How To write Multiple where Condition in LINQ Query? Hello, yes you can use LINQ to query data in a DataGridView. Which method performs better: .Any() vs .Count() > 0? If p.ConditionVariable != 0, I need to get the record from table2 with id == ConditionVariable. Asking for help, clarification, or responding to other answers. 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 : Provide an answer or move on to the next question. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Using If Condition in LINQ - YouTube Do you need your, CodeProject, But as Kelsey pointed out this would work too -. 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 . Find centralized, trusted content and collaborate around the technologies you use most. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Basic LINQ Query Operations (C#) | Microsoft Learn Please Sign up or sign in to vote. To learn more, see our tips on writing great answers. Booking What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? LINQ . I need to ignore filter condition if line id is 0 and empty. Chakra Basics; Gemstones; Main Menu For example, assigning grades (A, B, C) based on marks obtained by a student. How do I align things in the following tabular environment? Passing a state into if else statement in react. At some scenarios, there is need of conditional statement in LINQ. But my case is, if conditionvariable > 0. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? If you want to share one variable between scopes, you'll need to declare it outside. For more information about extension methods, see Extension Methods. With your particular code, the answer is really simple: In general though, to apply very different queries, you could either use: Or you could maybe use the conditional operator to construct the right predicate: Move the isDup test into the Where expression itself.