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

Short story taking place on a toroidal planet or moon involving flying. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. What if p.ConditionVariable != 0? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. If you preorder a special airline meal (e.g. Home; Mine; Mala Menu Toggle. 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. Making statements based on opinion; back them up with references or personal experience. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. When to use .First and when to use .FirstOrDefault with LINQ? These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. A Computer Science portal for geeks. I need the record with id equals to that conditionVariable. However, I suggest rethinking your code and doing somthing like following: Please also note that result will never be null, therefore, I have replaced it with Any but it is not a gist of the question, I believe. I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. The reason that they can have different types is because the first two declarations belong to different scopes. The variable is limited to the block it is declared in. 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. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Not the answer you're looking for? Not sure how to fix this. 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! July 7, 2021 In c++, linq, linq-to-sql 6 Comments Is it possible to use If Else conditional in a LINQ query? Should isn't does. select p.PAge.Value).FirstOrDefault(); @Tudor, I can't understand the performance problem. Is it a bug? The Select clause is used to shape the data. rev2023.3.3.43278. 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. At some scenarios, there is need of conditional statement in LINQ. rev2023.3.3.43278. Not the answer you're looking for? For example, you must use a method call to express a query that retrieves the number of elements that match a specified condition. This is what I did. Users can follow the syntax below to use the inline if statement in JavaScript. +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". Connect and share knowledge within a single location that is structured and easy to search. Very useful if it does. This is a where, so you should use a strongly typed list. 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. Booking How is LINQ to SQL protected from SQL-injection attacks? I need to reduce source code by removing below if conditions, how tofilter data in same query without using if condition? Is there a way to choose different search criteria depending on the bool value? Why are trials on "Law & Order" in the New York Supreme Court? 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. There are there Contains Methods available in C# and they are implemented in two different namespaces. If a question is poorly phrased then either ask for clarification, ignore it, or. Find centralized, trusted content and collaborate around the technologies you use most. On the right side of the expression, notice that the where clause is now expressed as an instance method on the numbers object, which as you will recall has a type of IEnumerable. But my case is, if conditionvariable > 0. Select To support grouping, the LINQ provides the group.by operation. I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! This video gives an idea on usage of If condition in LINQ through a simple scenario. Using LINQ Method Syntax, it is a little difficult to write the join query when joining more than two data sources. How can I change property names when serializing with Json.net? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. When no results are returned, you have an 'empty' list. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Is it possible to rotate a window 90 degrees if it has the same length and width? If that is not what you are doing, show some sample data. Why are non-Western countries siding with China in the UN? Is that what you want? Why should transaction_version change with removals? This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. dateTo, List<AccountRootType> accountRootTypes = null . "Prospect" : (deals.Count () == 1 ? LINQ to SQL avoids such . 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. Why are non-Western countries siding with China in the UN? return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. What video game is Charlie playing in Poker Face S01E07? rev2023.3.3.43278. from prob in table2.where (p => p.Id == p.ConditionVariable && !p.IsBlocked && p.IsActive) if p.conditionVariable == 0 the following remains the same. The following example the data can be data bound or unbound. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Hello, yes you can use LINQ to query data in a DataGridView. Later in the code, I want to loop through the object (alDisabledPrograms). Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. Short story taking place on a toroidal planet or moon involving flying. The conditional operator (? Minimising the environmental effects of my dyson brain. What if I have more than two cases, is there possibility to do that? How do particle accelerators like the LHC bend beams of particles? Using .Select and .Where in a single LINQ statement To learn more, see our tips on writing great answers. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. Are there tables of wastage rates for different fruit and veg? Don't tell someone to read the manual. With Linq, can I use a conditional statement inside of a Where extension method? In the above syntax, a condition is an expression. Asking for help, clarification, or responding to other answers. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Handling null values and missing columns in Linq-to-Xml, How to use LINQ to select object with minimum or maximum property value, The entity cannot be constructed in a LINQ to Entities query. Is a PhD visitor considered as a visiting scholar? You can create a new method to check age using if else and call that method from linq Query Result=CheckAge(p.Age), You can use Conditional Logic in the select, sorry i'm confuse with syntax it's my request u define it clearly, That is nothing but if(age<=24) {} else {}, http://msdn.microsoft.com/en-us/library/ty67wk28(v=VS.71).aspx. 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. If a question is poorly phrased then either ask for clarification, ignore it, or. The problem is that you are trying to use procedural control flow logic in the where clause. This Which is equal to: list.Where(item => Foo(item)); How Intuit democratizes AI development across teams through reusability. How do I align things in the following tabular environment? 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. c# Connect and share knowledge within a single location that is structured and easy to search. So you have two results, one in if block and one in else block which are different and are not visible outside their blocks. . as someone commented but in this case it is not really necessary as you have the || && operators there anyway. Edit: You can make combinations like this: Status = (deals.Count () == 0 ? Why are non-Western countries siding with China in the UN? How do you get out of a corner when plotting yourself into a corner. 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. Find centralized, trusted content and collaborate around the technologies you use most. I had a scenario like this where I had to check for null within the list itself. if (value == 21) By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. From Frequently Asked Questions (LINQ to SQL) Q. Find centralized, trusted content and collaborate around the technologies you use most. ConditionVariable will not have any value by default. rev2023.3.3.43278. 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. 1. Connect and share knowledge within a single location that is structured and easy to search. from dbo. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? A place where magic is studied and practiced? I'm adding accountRootTypes as param inside the query if we keep it null it's returning 'Nullable object must have a value' how can I do the condition here. Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. Some queries must be expressed as method calls. 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. If we compare the inline if statement with the if . You need to understand that what's in the WEHRE clause is a boolean expression not a statement. LINQ is a great feature for querying large datasets in faster way than normal approach. available from Rexburg Motor Sports in Rexburg, Idaho. Why are trials on "Law & Order" in the New York Supreme Court? This inline expression is called a lambda expression. Thoughts? spelling and grammar. To get started using LINQ, you do not have to use lambdas extensively. 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 ? 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. 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. LINQ query syntax always ends with a Select or Group clause. For this example I have used of Northwind database that you can download using the link given below. 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 are physically impossible and logically impossible concepts considered separate in terms of probability? 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? Replacing broken pins/legs on a DIP IC package. For example, assigning grades (A, B, C) based on marks obtained by a student. Is it possible to create a concave light? Do you need your, CodeProject, Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. Understand that English isn't everyone's first language so be lenient of bad Asking for help, clarification, or responding to other answers. ); } var alDisabledPrograms = roles.Descendants (.) Connect and share knowledge within a single location that is structured and easy to search. The WHERE clause reduces to True or False, and the first expression looks supect. If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. 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. 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. Means it is mostly used in querying purpose like fetch largest value from an array. Minimising the environmental effects of my dyson brain, Time arrow with "current position" evolving with overlay number. 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. Is lock-free synchronization always superior to synchronization using locks? Also you need paranthesis around the condition in the second if statement. How to show that an expression of a finite type must be one of the finitely many possible values? This should work. The example uses an integer array as a data source for convenience; however, the same concepts apply to other data sources also.