linq query with if else condition c#

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. LINQ queries can be applied for CRUD operations . What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Connect and share knowledge within a single location that is structured and easy to search. 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 } 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. Please Sign up or sign in to vote. The conditional operator (? I need this because I will need sorting based on Status. //queryAllCustomers is an IEnumerable<Customer> var queryAllCustomers = from cust in customers select cust; The range variable is like the iteration variable in a foreach loop except that no actual iteration . I know this will probably be a newbie question. SingleOrDefault () method will return the only element in the sequence that . 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 . If you feel any content is violating any terms please, This site makes use of Cookies. I had a scenario like this where I had to check for null within the list itself. The region and polygon don't match. Means it is mostly used in querying purpose like fetch largest value from an array. 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 nest a conditional query, you can write the in place of the list of the outside query. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. 6 Tips for Writing Elegant C# Code - telerik.com By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is it possible to create a concave light? if-else if if-else. Our LINQ statement where clause condition ask for rows where this column contains Germany. At some scenarios, there is need of conditional statement in LINQ. In the above example, we selected the each resulted string elements. Isn't the result of a LINQ query an IEnumerable<>? { toprint = "Below"; } I need to ignore filter condition if line id is 0 and empty. Is your question about building the expression-tree without the arg-names or anything different I did not catch? The ValueHolder factor is the same variable created from the from operator. rev2023.3.3.43278. :) returns one of two values depending on the value of a Boolean expression. Not the answer you're looking for? For more information, see Lambda Expressions. Find an item in a list by LINQ in C# - iditect.com So you have two results, one in if block and one in else block which are different and are not visible outside their blocks. Thoughts? Youll be auto redirected in 1 second. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? The following code snippet shows how to write the query to fetch data from three data sources using the LINQ Method syntax. If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. Acidity of alcohols and basicity of amines. 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; LINQ Contains Method in C# with Examples - Dot Net Tutorials So we should be getting this as output from both queries. :) returns These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. The content must be between 30 and 50000 characters. Understand that English isn't everyone's first language so be lenient of bad available from Rexburg Motor Sports in Rexburg, Idaho. 1 solution Solution 1 You don't need LINQ or a ternary operator. See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. 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 ""; } 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. Coding example for the question If Else statement Powershell CSV-powershell. What if p.ConditionVariable != 0? Not the answer you're looking for? This is same as a new list created. Not the answer you're looking for? "We, who've been connected by blood to Prussia's throne and people since Dppel". Why are non-Western countries siding with China in the UN? spelling and grammar. if (value <= 12) ncdu: What's going on with this second size column? Why should transaction_version change with removals? Provide an answer or move on to the next question. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement If a question is poorly phrased then either ask for clarification, ignore it, or. Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . In a LINQ query, the from clause comes first in order to introduce the data source ( customers) and the range variable ( cust ). rev2023.3.3.43278. To learn more, see our tips on writing great answers. @Tudor, I can't understand the performance problem. Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. Viewed 9 times. 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. ConditionVariable will not have any value by default. 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. UiPath | LINQ IF Condition | IF for Arrays | IF for Data Tables | IF for empty output of LINQ query 1,442 views Nov 11, 2021 #rpa #uipath #linq .more Dislike Share. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. if statement - LINQ - if condition - Stack Overflow I tried to initially var result = null but C# didn't like that. But my case is, if conditionvariable > 0. Asking for help, clarification, or responding to other answers. In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . Is a PhD visitor considered as a visiting scholar? Making statements based on opinion; back them up with references or personal experience. To learn more, see our tips on writing great answers. These are all the standard query operators. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If else condition in multiple from in LINQ in C# - Stack Overflow The problem is that you are trying to use procedural control flow logic in the where clause. LINQ Query Operators - LINQ Tutorials - DotNetPattern.com In C# => is the lambda operator, which is read as "goes to". Chakra Basics; Gemstones; Main Menu What's the difference between a power rail and a signal line? 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. This applies the condition3 only if condition2 is false. The WHERE clause reduces to True or False, and the first expression looks supect. +1 (416) 849-8900, where (ISSTUDENT == true ? This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). What is a word for the arcane equivalent of a monastery? The site does not provide any warranties for the posted content. rev2023.3.3.43278. . as someone commented but in this case it is not really necessary as you have the || && operators there anyway. Booking Asking for help, clarification, or responding to other answers. Is it correct to use "the" before "materials used in making buildings are"? The following examples demonstrate some simple LINQ queries by using each approach listed previously. This is only viable if you don't need the element's value in the condition. The standard query operators are implemented as a new kind of method called extension methods. Thanks for contributing an answer to Stack Overflow! Don't tell someone to read the manual. LINQ query syntax always ends with a Select or Group clause. 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 ? 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. Now please take its reference and correct your code. The variable is limited to the block it is declared in. LinqExpression()_linq expression_maiker- Status = (Deals.Count() == 0 ? 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. July 7, 2021 In c++, linq, linq-to-sql 6 Comments Is it possible to use If Else conditional in a LINQ query? this is excellent and should be shared all over the web, only good answer for any conditional where statement. After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. Minimising the environmental effects of my dyson brain. Do I need a thermal expansion tank if I already have a pressure tank? Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. If a question is poorly phrased then either ask for clarification, ignore it, or. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? How to write an inline IF statement in JavaScript? If you are using LinQ with EF Core, an easy example can be this-. Finite abelian groups with fewer automorphisms than a subgroup. How do I align things in the following tabular environment? Users can follow the syntax below to use the inline if statement in JavaScript. Query Syntax and Method Syntax in LINQ (C#) | Microsoft Learn LINQ (Language Integrated Query) is a Microsoft programming model and methodology that essentially adds formal query capabilities into Microsoft .NET-based programming languages. 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. Why are physically impossible and logically impossible concepts considered separate in terms of probability? What sort of strategies would a medieval military use against a fantasy giant? The conditional operator (? rev2023.3.3.43278. Acidity of alcohols and basicity of amines, Theoretically Correct vs Practical Notation. LINQ . Why are trials on "Law & Order" in the New York Supreme Court? Wrong answer. How would I run an async Task method synchronously? Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.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. Ask for this RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. 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. The "return value" is just the expression result. The reason that they can have different types is because the first two declarations belong to different scopes. Regards, Nived N Happy Automation This video gives an idea on usage of If condition in LINQ through a simple scenario. What sort of strategies would a medieval military use against a fantasy giant? ); } var alDisabledPrograms = roles.Descendants (.) I need to reduce source code by removing below if conditions, how tofilter data in same query without using if condition? that's it, except it has to be deals.Count() instead of Deal. 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. @HafizH can you give a feedback of solutions below? I'll explain in detail. How Intuit democratizes AI development across teams through reusability. What video game is Charlie playing in Poker Face S01E07? You can see that the type of the query variable is the same in both forms: IEnumerable. 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. 1. s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? . However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. 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 ? Which method performs better: .Any() vs .Count() > 0? 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. code - block - 1 : code - block - 2. Is it possible to create a concave light? Do I need a thermal expansion tank if I already have a pressure tank? If condition2 is true, you are essentially doing && true which has no effect on the where clause. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. . I have a scenario where table2 has a column called ConditionVariable and id. Linq C# If else statement - CodeProject one of two values depending on the c# - If Else in LINQ - Stack Overflow Does Counterspell prevent from any further spells being cast on a given turn? 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. Then use ToList() and you can check if your list has more than one item in it. spelling and grammar. "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. 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 . Making statements based on opinion; back them up with references or personal experience. 2024 LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. / E.S. How to use conditional where statements in LINQ? if (value == 21) When to use .First and when to use .FirstOrDefault with LINQ? 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. 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. Language Integrated Query (LINQ) provider for C# Provide an answer or move on to the next question. vegan) just to try it, does this inconvenience the caterers and staff? Connect and share knowledge within a single location that is structured and easy to search. Thanks for contributing an answer to Stack Overflow! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. These operators are also used for implementing paging. 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 However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. For this example I have used of Northwind database that you can download using the link given below. Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. If it has any value then I need to search the id which is equal to conditionvariable in table2. The content you requested has been removed. Making statements based on opinion; back them up with references or personal experience. You can simply use List to create a search collection. Why are non-Western countries siding with China in the UN? If you want to use if/else conditions, you can use something like this. ); } else { roles = roles.Where (dp => . Making statements based on opinion; back them up with references or personal experience. Can I tell police to wait and call a lawyer when served with a search warrant? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. C# Program to Check a Specified City Exists in the List Collection The following example shows a simple query expression and the semantically equivalent query written as a method-based query. In the below example, we are using the LINQ Method Syntax to . @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. Using .Select and .Where in a single LINQ statement c# - Expression.Lambda returns with "The LINQ expression could not What is Mala? 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. IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? Is there a single-word adjective for "having exceptionally strong moral principles"? Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. Subscribe to my channel too if you hadn't done it already for more updates. You can perform the where separately from the main query: You need to declare the result variable before the first if-else. 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. Chances are they have and don't get it. When to use .First and when to use .FirstOrDefault with LINQ? I need the record with id equals to that conditionVariable. 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. Why should transaction_version change with removals? For more information about standard query operators, see Standard Query Operators Overview (C#). not an object? @value= TotalBookingPrice In code, the commented part is what I need to solve Is there a way to write such query in LINQ? How to prove that the supernatural or paranormal doesn't exist? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. if "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. Is there a reason for C#'s reuse of the variable in a foreach? 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); Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? What's the difference between a power rail and a signal line? You can assign the IEnumerable to an object reference, but once it's there, you can't do much of value with it; you can't enumerate it or call any linq methods on it without casting it back to IEnumerable. A Computer Science portal for geeks. 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. This inline expression is called a lambda expression. Basic LINQ Query Operations (C#) | Microsoft Learn How to use if else statement in combobox in VB.NET. When to use .First and when to use .FirstOrDefault with LINQ? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. Not the answer you're looking for? The first where clause checks for the income that is greater than 25,000 and the second where clause looks for the income that is less than 45,000. return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. c# - MsBuild StartsWith - MsBuild StartsWith not Evaluating In If so then how can I do that? s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID. Understand that English isn't everyone's first language so be lenient of bad 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 dateTo, List<AccountRootType> accountRootTypes = null . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Linq C# If else statement. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Short story taking place on a toroidal planet or moon involving flying. Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. You can select the whole object as it is or only some properties of it. 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? 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. . 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. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? 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. Connect and share knowledge within a single location that is structured and easy to search. The num on the left of the operator is the input variable which corresponds to num in the query expression. @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. LINQ query in C# by method syntax, using the lambda operator > Next is another use of LINQ in C#, except this time the more standard syntax is used to call the LINQ API. Home; Mine; Mala Menu Toggle. 5. Connect and share knowledge within a single location that is structured and easy to search. A Computer Science portal for geeks. Linq To SQL And SQL Injection - comesql.blogspot.com In general, the rule is to use (1) whenever possible, and use (2) and (3 .

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