linq query with if else condition c#

Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? If that is not what you are doing, show some sample data. rev2023.3.3.43278. Asking for help, clarification, or responding to other answers. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Which is equal to: list.Where(item => Foo(item)); How Intuit democratizes AI development across teams through reusability. How to show that an expression of a finite type must be one of the finitely many possible values? The following example the data can be data bound or unbound. 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. Here are some key differences between if/else and switch-case: if/else can handle multiple conditions in a single statement, whereas switch-case can only handle a single variable or expression. Asking for help, clarification, or responding to other answers. Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. The following code snippet shows how to write the query to fetch data from three data sources using the LINQ Method syntax. Therefore, even when getting started writing LINQ queries, it is useful to be familiar with how to use method syntax in queries and in query expressions themselves. This is only viable if you don't need the element's value in the condition. +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. so, if 'someCondition' is false, 'Where' will be skipped. Dynamic or operation. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. Don't tell someone to read the manual. This video gives an idea on usage of If condition in LINQ through a simple scenario. Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . Thoughts? c# You can perform the where separately from the main query: You need to declare the result variable before the first if-else. Why should transaction_version change with removals? Each { } gets its own scope. 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. Linq C# If else statement. Modified today. At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. How do I align things in the following tabular environment? { toprint = "Get it"; }. vegan) just to try it, does this inconvenience the caterers and staff? LINQ (Language Integrated Query) is a Microsoft programming model and methodology that essentially adds formal query capabilities into Microsoft .NET-based programming languages. . 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. Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. : is nothing but if else else if else. Let me know if you need any help with this query. Passing a state into if else statement in react. Is there a single-word adjective for "having exceptionally strong moral principles"? Chances are they have and don't get it. Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. Acidity of alcohols and basicity of amines. 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 ? b : c) - however, I don't know if it will work with your different queries like that (after all, how would your write the TSQL?). Very useful if it does. c.Name:c.SuperTerm.Name.IndexOf (searchValue)) .ThenBy (t => t.Producer) .TolistAsync (); Share Follow answered Oct 22, 2021 at 11:17 Abrar Jahin 13.7k 23 108 159 Add a comment Your Answer ncdu: What's going on with this second size column? Do I need a thermal expansion tank if I already have a pressure tank? 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? Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. Users can follow the syntax below to use the inline if statement in JavaScript. - 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 Provide an answer or move on to the next question. Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria. These are all the standard query operators. The standard query operators extend IEnumerable and that is why you can write numbers.Where(). 1 solution Solution 1 You don't need LINQ or a ternary operator. But now, since the same variable is used in all three places, there is a compiler error that the types don't match: Note, with your code your result will always be non-null. 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 a combination of query syntax and method syntax. However, certain queries can only be expressed in method syntax and some of those require lambda expressions. Acidity of alcohols and basicity of amines. For this example I have used of Northwind database that you can download using the link given below. Is it possible to create a concave light? Youll be auto redirected in 1 second. More info about Internet Explorer and Microsoft Edge. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. Find centralized, trusted content and collaborate around the technologies you use most. Should isn't does. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What sort of strategies would a medieval military use against a fantasy giant? Is a PhD visitor considered as a visiting scholar? You can call them directly by using method syntax instead of query syntax. mustang mach e dark matter grey. Does Counterspell prevent from any further spells being cast on a given turn? Making statements based on opinion; back them up with references or personal experience. if p.conditionVariable == 0 the following remains the same. Is there a way to choose different search criteria depending on the bool value? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? 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. Why do small African island nations perform better than African continental nations, considering democracy and human development? Extensions methods "extend" an existing type; they can be called as if they were instance methods on the type. Isn't the result of a LINQ query an IEnumerable<>? Why is this sentence from The Great Gatsby grammatical? . by stock number or make and model. Connect and share knowledge within a single location that is structured and easy to search. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. Which method performs better: .Any() vs .Count() > 0? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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 . LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria. rev2023.3.3.43278. This is what I did. Minimising the environmental effects of my dyson brain. Coding example for the question If Else statement Powershell CSV-powershell. At some scenarios, there is need of conditional statement in LINQ. Not the answer you're looking for? To understand the method-based query, let's examine it more closely. To get started using LINQ, you do not have to use lambdas extensively. Connect and share knowledge within a single location that is structured and easy to search. Viewed 9 times. 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 Category is the new factor of our formula. Regards, Nived N Happy Automation Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. "Prospect" : (deals.Count () == 1 ? What video game is Charlie playing in Poker Face S01E07? The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. If a question is poorly phrased then either ask for clarification, ignore it, or. Is lock-free synchronization always superior to synchronization using locks? How to follow the signal when reading the schematic? These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. 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. In my case there were two "conditional" where depending on search keys, so I did: This is how can you can do it with the noob Linq syntax. LINQ to SQL avoids such . Why are non-Western countries siding with China in the UN? LinqExpression()_linq expression_maiker-. This is what the compiler does behind the scenes when you write queries by using query syntax. 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. Replacing broken pins/legs on a DIP IC package. The conditional operator (? int value = (from p in dc.Patients I had a scenario like this where I had to check for null within the list itself. I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. The standard query operators are implemented as a new kind of method called extension methods. Execute the query. 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. We have specified two where conditions in both linq and lambda queries. / E.S. :" is translated to a "case" expression and there are subqueries. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. When to use .First and when to use .FirstOrDefault with LINQ? 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? This Not the answer you're looking for? The following examples demonstrate some simple LINQ queries by using each approach listed previously. I tried to initially var result = null but C# didn't like that. You're welcome to try, of course Answer above is not suitable for complicate Linq expression. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement Thanks for contributing an answer to Stack Overflow! This should work. s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? ); } else { roles = roles.Where (dp => . There is a swigly line under the result in if (result!= null) saying that the name result does not exist in the current context. Does a summoned creature play immediately after being summoned by a ready action? If you want to use if/else conditions, you can use something like this. All you need is C# It be nice to have confirmation that this does work. 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. string toprint = string.Empty; Why should transaction_version change with removals? 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. You can create a new method to check age using if else and call that method from linq Query Result=CheckAge (p.Age) public string CheckAge (int age) { if (age <= 24) return "Age is less than 24 yrs"; else if (age <= 40) return "Age is less than 40 yrs"; else if (age >= 60) return "Age is more than 60 yrs"; return ""; }

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