linq query with if else condition c#

Provide an answer or move on to the next question. To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. foreach - Declare variable of different type foreach Type - Declare a variable using a Type variable Console.ReadLine else-if - Console.ReadLine unexpected behaviour in else-if statement If, Else-If - If, Else-If Logic Check if . For more information, see Lambda Expressions. Is it possible to create a concave light? There is a swigly line under the result in if (result!= null) saying that the name result does not exist in the current context. But as Kelsey pointed out this would work too -. Home; Mine; Mala Menu Toggle. I have no idea what you are asking, please clarify the question. Is there a reason for C#'s reuse of the variable in a foreach? Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. In the below example, we are using the LINQ Method Syntax to . How can I change property names when serializing with Json.net? 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. Provide an answer or move on to the next question. These are all the standard query operators. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Connect and share knowledge within a single location that is structured and easy to search. +1 (416) 849-8900, where (ISSTUDENT == true ? Acidity of alcohols and basicity of amines. Asking for help, clarification, or responding to other answers. Are there tables of wastage rates for different fruit and veg? 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. What sort of strategies would a medieval military use against a fantasy giant? The Category is the new factor of our formula. Why should transaction_version change with removals? Connect and share knowledge within a single location that is structured and easy to search. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. 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. So you have two results, one in if block and one in else block which are different and are not visible outside their blocks. Then use ToList() and you can check if your list has more than one item in it. See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. It be nice to have confirmation that this does work. Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable, Concat all strings inside a List using LINQ, Using LINQ to remove elements from a List. I know this will probably be a newbie question. Making statements based on opinion; back them up with references or personal experience. The first time result is an int, the second time I declare a string, and the third time result is undeclared. Not the answer you're looking for? If condition2 is true, you are essentially doing && true which has no effect on the where clause. Does Counterspell prevent from any further spells being cast on a given turn? that's it, except it has to be deals.Count() instead of Deal. For more information about extension methods, see Extension Methods. In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . / E.S. 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. 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. LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria. Finite abelian groups with fewer automorphisms than a subgroup. 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. available from Rexburg Motor Sports in Rexburg, Idaho. Is it possible to use If Else conditional in a LINQ query? The standard query operators extend IEnumerable and that is why you can write numbers.Where(). 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 . rev2023.3.3.43278. How do particle accelerators like the LHC bend beams of particles? if (value == 21) For example, assigning grades (A, B, C) based on marks obtained by a student. 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. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. When no results are returned, you have an 'empty' list. Find centralized, trusted content and collaborate around the technologies you use most. data source) contains a specified element or not. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. A Computer Science portal for geeks. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! You can select the whole object as it is or only some properties of it. This is what the compiler does behind the scenes when you write queries by using query syntax. Making statements based on opinion; back them up with references or personal experience. 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 . Asking for help, clarification, or responding to other answers. Users can follow the syntax below to use the inline if statement in JavaScript. ? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. You can see that the type of the query variable is the same in both forms: IEnumerable. From Frequently Asked Questions (LINQ to SQL) Q. Acidity of alcohols and basicity of amines. 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. If we compare the inline if statement with the if . Passing a state into if else statement in react. All you need is: If clientId = 0 we want ALL employees,. Why are trials on "Law & Order" in the New York Supreme Court? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. c# If so then how can I do that? The Select clause is used to shape the data. Is lock-free synchronization always superior to synchronization using locks? How Intuit democratizes AI development across teams through reusability. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 This applies the condition3 only if condition2 is false. And because a query variable does not store the results of the query, you can modify it or use it as the basis for a new query at any time, even after it has been executed. The following example shows how the three parts of a query operation are expressed in source code. Coding example for the question If Else statement Powershell CSV-powershell. They are required. A Computer Science portal for geeks. Execute the query. If you are using LinQ with EF Core, an easy example can be this-. All you need is C# 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). I'm really sorry if i am making it complex, If else condition in multiple from in LINQ in C#, How Intuit democratizes AI development across teams through reusability. Does a barbarian benefit from the fast movement ability while wearing medium armor? Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. This Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. To support grouping, the LINQ provides the group.by operation. 0.00/5 (No votes) See more: C#. 1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. Not the answer you're looking for? 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); Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . The "? To learn more, see our tips on writing great answers. 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. Chakra Basics; Gemstones; Main Menu Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. What video game is Charlie playing in Poker Face S01E07? This video gives an idea on usage of If condition in LINQ through a simple scenario. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. The content must be between 30 and 50000 characters. How to follow the signal when reading the schematic? Is there a proper earth ground point in this switch box? LINQ . 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. Edit: You can make combinations like this: In this case your are using deals.Count() a lot, so you can store the result in a temporary variable using the LINQ let syntax: Thanks for contributing an answer to Stack Overflow! 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 : What is the correct way to screw wall and ceiling drywalls? Modified today. I need to reduce source code by removing below if conditions, how tofilter data in same query without using if condition? Why are non-Western countries siding with China in the UN? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Why do small African island nations perform better than African continental nations, considering democracy and human development? Understand that English isn't everyone's first language so be lenient of bad Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. dateTo, List<AccountRootType> accountRootTypes = null . Chances are they have and don't get it. Do new devs get fired if they can't solve a certain bug? . ); } var alDisabledPrograms = roles.Descendants (.) Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Which method performs better: .Any() vs .Count() > 0? @hanzolo any IEnumerable is also an object. 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; Asking for help, clarification, or responding to other answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Has 90% of ice around Antarctica disappeared in less than a decade? Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. In a LINQ query, the from clause comes first in order to introduce the data source ( customers) and the range variable ( cust ). Why are non-Western countries siding with China in the UN? How to prove that the supernatural or paranormal doesn't exist? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. "We, who've been connected by blood to Prussia's throne and people since Dppel", Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. I know the if/else is not correct, I put that in there to show how I'd like that to be handled. At some scenarios, there is need of conditional statement in LINQ. Does a summoned creature play immediately after being summoned by a ready action? Each { } gets its own scope. Wrong answer. 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 reference documentation for the standard query operators in the System.Linq namespace generally uses method syntax. To get started using LINQ, you do not have to use lambdas extensively. Isn't the result of a LINQ query an IEnumerable<>? LINQ query is great feature helping to query the large datasets much faster.There are certain times where we had to use a conditional statement in LINQ query. July 7, 2021 In c++, linq, linq-to-sql 6 Comments Is it possible to use If Else conditional in a LINQ query? We have specified two where conditions in both linq and lambda queries. Find centralized, trusted content and collaborate around the technologies you use most. Thanks for contributing an answer to Stack Overflow! 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. However, a certain dynamic can also be realized through the method or collection method. Now please take its reference and correct your code. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? Find centralized, trusted content and collaborate around the technologies you use most. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

linq query with if else condition c# 2023