linq query with if else condition c#

After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. This should work. this is excellent and should be shared all over the web, only good answer for any conditional where statement. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. 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. Using .Select and .Where in a single LINQ statement Dynamic or operation. Connect and share knowledge within a single location that is structured and easy to search. These are all the standard query operators. I know the if/else is not correct, I put that in there to show how I'd like that to be handled. Extensions methods "extend" an existing type; they can be called as if they were instance methods on the type. return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. What if p.ConditionVariable != 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. 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. Can I tell police to wait and call a lawyer when served with a search warrant? Do I need a thermal expansion tank if I already have a pressure tank? If a question is poorly phrased then either ask for clarification, ignore it, or. 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). Why are trials on "Law & Order" in the New York Supreme Court? string toprint = string.Empty; A limit involving the quotient of two sums. Why are non-Western countries siding with China in the UN? 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. Why should transaction_version change with removals? +1 (416) 849-8900, where (ISSTUDENT == true ? Condition? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Do I need a thermal expansion tank if I already have a pressure tank? Edit: You can make combinations like this: Status = (deals.Count () == 0 ? The content you requested has been removed. Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. ); } var alDisabledPrograms = roles.Descendants (.) Understand that English isn't everyone's first language so be lenient of bad Find centralized, trusted content and collaborate around the technologies you use most. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). IF ELSE condition in Linq Where clause using C# and VB.Net in ASP.Net sureshMGR on Jan 29, 2021 12:07 AM Sample_180542.zip 13435 Views Answered Hi friends, I need to reduce source code by removing below if conditions, how to filter data in same query without using if condition? dateFrom, DateTimeOffset? The conditional operator (? but for any clientId between 1 and 999 we want only clients with that ID. To learn more, see our tips on writing great answers. Optimizing Queries with LINQ . 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. A Computer Science portal for geeks. "One deal" : "Many deals")), How Intuit democratizes AI development across teams through reusability. Is it possible to use If Else conditional in a LINQ query? Why do small African island nations perform better than African continental nations, considering democracy and human development? I had a scenario like this where I had to check for null within the list itself. Thanks for contributing an answer to Stack Overflow! rev2023.3.3.43278. 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. Does Counterspell prevent from any further spells being cast on a given turn? So we should be getting this as output from both queries. Subscribe to my channel too if you hadn't done it already for more updates. The standard query operators are implemented as a new kind of method called extension methods. @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. Php if else statement autamaticaly goes to else part. It be nice to have confirmation that this does work. Has 90% of ice around Antarctica disappeared in less than a decade? 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. Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. Why should transaction_version change with removals? Connect and share knowledge within a single location that is structured and easy to search. Find centralized, trusted content and collaborate around the technologies you use most. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. 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 . Is it possible to create a concave light? +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". However, a certain dynamic can also be realized through the method or collection method. LINQ is a great feature for querying large datasets in faster way than normal approach. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. { toprint = "Normal"; } If p.ConditionVariable != 0, I need to get the record from table2 with id == ConditionVariable. 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# Find centralized, trusted content and collaborate around the technologies you use most. Syntax. What video game is Charlie playing in Poker Face S01E07? How do particle accelerators like the LHC bend beams of particles? int value = (from p in dc.Patients We have specified two where conditions in both linq and lambda queries. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. To learn more, see our tips on writing great answers. In Stored Procedure we use if Cond. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 To understand the method-based query, let's examine it more closely. 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?). For more information about extension methods, see Extension Methods. Is there a proper earth ground point in this switch box? 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. / E.S. - 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 If you want to use if/else conditions, you can use something like this. Why are trials on "Law & Order" in the New York Supreme Court? Connect and share knowledge within a single location that is structured and easy to search. When to use .First and when to use .FirstOrDefault with LINQ? How to follow the signal when reading the schematic? Some queries must be expressed as method calls. How is LINQ to SQL protected from SQL-injection attacks? Is a collection of years plural or singular? c# Operator (C# Reference) [ ^] So, what have you tried to achieve? 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. LinqExpression()_linq expression_maiker-. If you preorder a special airline meal (e.g. Create the query. When to use .First and when to use .FirstOrDefault with LINQ? Wrong answer. not an object? Is that what you want? vegan) just to try it, does this inconvenience the caterers and staff? that's it, except it has to be deals.Count() instead of Deal. This is what I did. If we compare the inline if statement with the if . To learn more, see our tips on writing great answers. @Richard in case if i need to call a function on else condition, is it possible? 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. "Prospect" : (deals.Count () == 1 ? You need to understand that what's in the WEHRE clause is a boolean expression not a statement. @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. 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. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. The following example shows how the three parts of a query operation are expressed in source code. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, ifthen to concat SQL queries, equivalent in LINQ - VB NET, C# Linq Query on database using field name as a variable, Building a lambda WHERE expression to pass into a method, Dynamic LINQ OrderBy on IEnumerable / IQueryable. 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. / E.S. Not the answer you're looking for? 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. However, certain queries can only be expressed in method syntax and some of those require lambda expressions. 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. 1 solution Solution 1 You don't need LINQ or a ternary operator. dateTo, List<AccountRootType> accountRootTypes = null . one of two values depending on the Is it suspicious or odd to stand by the gate of a GA airport watching the planes? This is what the compiler does behind the scenes when you write queries by using query syntax. // Still no data is yet fetched. In the above syntax, a condition is an expression. if "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. What is the correct way to screw wall and ceiling drywalls? 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. 0.00/5 (No votes) See more: C#. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. We can see there is just one income between 25000 and 40000. Minimising the environmental effects of my dyson brain. At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. Why should transaction_version change with removals? In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. What sort of strategies would a medieval military use against a fantasy giant? @Tudor, I can't understand the performance problem. With Linq, can I use a conditional statement inside of a Where extension method? The site does not provide any warranties for the posted content. Chances are they have and don't get it. Check this example. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. Asking for help, clarification, or responding to other answers. 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 ? To learn more, see our tips on writing great answers. 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. How to use if else statement in combobox in VB.NET. We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. The following example the data can be data bound or unbound. Is there a reason for C#'s reuse of the variable in a foreach? 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. How would I run an async Task method synchronously? "We, who've been connected by blood to Prussia's throne and people since Dppel". 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. 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? Don't tell someone to read the manual. Connect and share knowledge within a single location that is structured and easy to search. There are there Contains Methods available in C# and they are implemented in two different namespaces. Thanks! If condition2 is true, you are essentially doing && true which has no effect on the where clause. IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? The reference documentation for the standard query operators in the System.Linq namespace generally uses method syntax. This video gives an idea on usage of If condition in LINQ through a simple scenario. Why do small African island nations perform better than African continental nations, considering democracy and human development? . as someone commented but in this case it is not really necessary as you have the || && operators there anyway. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Does a summoned creature play immediately after being summoned by a ready action? Is it correct to use "the" before "materials used in making buildings are"? { toprint = "Below"; } What's the difference between a power rail and a signal line? Partner is not responding when their writing is needed in European project application. You can call them directly by using method syntax instead of query syntax. I know this will probably be a newbie question. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! Which is equal to: list.Where(item => Foo(item)); How Intuit democratizes AI development across teams through reusability. Why are non-Western countries siding with China in the UN? My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? from dbo. 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. 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. Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. Not the answer you're looking for? email is in use. What sort of strategies would a medieval military use against a fantasy giant? The WHERE clause reduces to True or False, and the first expression looks supect. : is nothing but if else else if else. Let me know if you need any help with this query. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Is a collection of years plural or singular? SingleOrDefault () method will return the only element in the sequence that . This condition is generally expressed using lambda expression. 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. 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. rev2023.3.3.43278. Also you need paranthesis around the condition in the second if statement. "No deals" : (Deals.Count() == 1 ? To nest a conditional query, you can write the in place of the list of the outside query. How to prove that the supernatural or paranormal doesn't exist? Why are non-Western countries siding with China in the UN? 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. 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. Not the answer you're looking for? 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 . What is Mala? Do new devs get fired if they can't solve a certain bug? Which method performs better: .Any() vs .Count() > 0? 1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. 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 } Chances are they have and don't get it. These operators are also used for implementing paging. I'll explain in detail. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The following examples demonstrate some simple LINQ queries by using each approach listed previously. I need to ignorefilter condition if line id is 0 and empty. Do you need your, CodeProject, To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Acidity of alcohols and basicity of amines. 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. Find centralized, trusted content and collaborate around the technologies you use most. ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. Are there tables of wastage rates for different fruit and veg? Asking for help, clarification, or responding to other answers. How Intuit democratizes AI development across teams through reusability. 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 ? Asking for help, clarification, or responding to other answers. The complete example code is given below. More info about Internet Explorer and Microsoft Edge. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This is a where, so you should use a strongly typed list. A Computer Science portal for geeks. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. :) returns one of two values depending on the value of a Boolean expression. Regards, Nived N Happy Automation Is it possible to create a concave light? rev2023.3.3.43278. value of a Boolean expression. Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . Chakra Basics; Gemstones; Main Menu To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. email is in use. This Home; Mine; Mala Menu Toggle. Finite abelian groups with fewer automorphisms than a subgroup. 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 ? How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? Is it possible to rotate a window 90 degrees if it has the same length and width? so, if 'someCondition' is false, 'Where' will be skipped. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. 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. The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. ncdu: What's going on with this second size column? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. LINQ's Distinct() on a particular property. Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. You can select the whole object as it is or only some properties of it. If so then how can I do that? These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. 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 follow the signal when reading the schematic? Users can follow the syntax below to use the inline if statement in JavaScript. If you want to share one variable between scopes, you'll need to declare it outside. To support grouping, the LINQ provides the group.by operation. The standard query operators extend IEnumerable and that is why you can write numbers.Where(). Is it a bug? 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 ""; } Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria.

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