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

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. To learn more, see our tips on writing great answers. How to show that an expression of a finite type must be one of the finitely many possible values? Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. Why do small African island nations perform better than African continental nations, considering democracy and human development? How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? . July 7, 2021 In c++, linq, linq-to-sql 6 Comments Is it possible to use If Else conditional in a LINQ query? There are there Contains Methods available in C# and they are implemented in two different namespaces. Thanks! email is in use. { toprint = "Get it"; }. 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); Execute the query. LINQ queries can be applied for CRUD operations . @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. "No deals" : (Deals.Count() == 1 ? For more information about standard query operators, see Standard Query Operators Overview (C#). @value= TotalBookingPrice Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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 . We can see there is just one income between 25000 and 40000. The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. However, certain queries can only be expressed in method syntax and some of those require lambda expressions. 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. This By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To get started using LINQ, you do not have to use lambdas extensively. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement The site does not provide any warranties for the posted content. 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. 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. The following example shows a simple query expression and the semantically equivalent query written as a method-based query. This condition is generally expressed using lambda expression. Php if else statement autamaticaly goes to else part. "One deal" : "Many deals")), How Intuit democratizes AI development across teams through reusability. Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. How do I align things in the following tabular environment? 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. Is there a proper earth ground point in this switch box? Use method syntax. if p.conditionVariable == 0 the following remains the same. It'll be interesting to see if that works if it does, I'd love to see the TSQL (assuming it does eager loading; for lazy loading, probably not too terrible). After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. A limit involving the quotient of two sums. Why is this the case? I was having issues with seperate LINQ statements not being the same (Deleted/Clients filters need to be on all queries), so by add these two lines it works (all be it until we have 999+ clients - which would be a happy re-factor day!! by stock number or make and model. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. Because queries return an IEnumerable, you compose them in method syntax by chaining the method calls together. Find centralized, trusted content and collaborate around the technologies you use most. The content must be between 30 and 50000 characters. The following examples demonstrate some simple LINQ queries by using each approach listed previously. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. . as someone commented but in this case it is not really necessary as you have the || && operators there anyway. If you want to share one variable between scopes, you'll need to declare it outside. Why are trials on "Law & Order" in the New York Supreme Court? If you feel any content is violating any terms please, This site makes use of Cookies. Is your question about building the expression-tree without the arg-names or anything different I did not catch? 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. Check this example. You can select the whole object as it is or only some properties of it. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is it possible to create a concave light? Making statements based on opinion; back them up with references or personal experience. This applies the condition3 only if condition2 is false. spelling and grammar. 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 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. C#. This is what I did. What sort of strategies would a medieval military use against a fantasy giant? The num on the left of the operator is the input variable which corresponds to num in the query expression. 0.00/5 (No votes) See more: C#. Subscribe to my channel too if you hadn't done it already for more updates. @OmerK Where does in-fact product IQueryable, if the object you are running the extension method on is also an IQueryable, if you run it on an IEnumerable, you will get an IEnumerable. From Frequently Asked Questions (LINQ to SQL) Q. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Ask for this RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? The standard query operators extend IEnumerable and that is why you can write numbers.Where(). A limit involving the quotient of two sums. In the above example, we selected the each resulted string elements. I know this will probably be a newbie question. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Use a combination of query syntax and method syntax. In code, the commented part is what I need to solve Is there a way to write such query in LINQ? 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. Is it better to return an empty object? 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 it suspicious or odd to stand by the gate of a GA airport watching the planes? SingleOrDefault () method will return the only element in the sequence that . I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. rev2023.3.3.43278. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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. When to use .First and when to use .FirstOrDefault with LINQ? However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. You're welcome to try, of course Answer above is not suitable for complicate Linq expression. Using .Select and .Where in a single LINQ statement Then use ToList() and you can check if your list has more than one item in it. I tried to initially var result = null but C# didn't like that. Viewed 9 times. Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. 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. ? Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . If p.ConditionVariable != 0, I need to get the record from table2 with id == ConditionVariable. These operators are also used for implementing paging. We have specified two where conditions in both linq and lambda queries. { toprint = "Below"; } Thoughts? If that is not what you are doing, show some sample data. 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. Not the answer you're looking for? s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? In my case, I wanted to keep the elements which met my criteria and log the ones that didn't without iterating multiple times. I need this because I will need sorting based on Status. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? Why should transaction_version change with removals? dateFrom, DateTimeOffset? How to follow the signal when reading the schematic? About an argument in Famine, Affluence and Morality. 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 : 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. Why are non-Western countries siding with China in the UN? 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# To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. Youll be auto redirected in 1 second. From your application's point of view, an extension method and a regular instance method are the same. 5. When to use .First and when to use .FirstOrDefault with LINQ? I had a scenario like this where I had to check for null within the list itself. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? 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. . I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. Acidity of alcohols and basicity of amines. 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? if (value >= 22) Why are physically impossible and logically impossible concepts considered separate in terms of probability? 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. Making statements based on opinion; back them up with references or personal experience. See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Does a barbarian benefit from the fast movement ability while wearing medium armor? What video game is Charlie playing in Poker Face S01E07? This Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. if "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. Now please take its reference and correct your code. If it has any value then I need to search the id which is equal to conditionvariable in table2. Operator (C# Reference) [ ^] So, what have you tried to achieve? 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 can simply use List to create a search collection. 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. where ID= 94685, OTDataContext dc = new OTDataContext(); Some queries must be expressed as method calls. :) returns When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. Although it looks as if IEnumerable has been redefined to include these additional methods, in fact this is not the case. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 but for any clientId between 1 and 999 we want only clients with that ID. So we should be getting this as output from both queries. 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. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. Thanks for contributing an answer to Stack Overflow! 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is a collection of years plural or singular? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How would I run an async Task method synchronously? @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. The following code snippet shows how to write the query to fetch data from three data sources using the LINQ Method syntax. Connect and share knowledge within a single location that is structured and easy to search. Asking for help, clarification, or responding to other answers. How do particle accelerators like the LHC bend beams of particles? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. Is it possible to rotate a window 90 degrees if it has the same length and width? If condition2 is true, you are essentially doing && true which has no effect on the where clause. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! What is a word for the arcane equivalent of a monastery? Making statements based on opinion; back them up with references or personal experience. Making statements based on opinion; back them up with references or personal experience. ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. Does Counterspell prevent from any further spells being cast on a given turn? I need to ignore filter condition if line id is 0 and empty. Home; Mine; Mala Menu Toggle. Why are trials on "Law & Order" in the New York Supreme Court? Modified today. 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. 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. 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. Select In general, the rule is to use (1) whenever possible, and use (2) and (3 . What video game is Charlie playing in Poker Face S01E07? "Prospect" : (deals.Count () == 1 ? For more information, see Lambda Expressions. Asking for help, clarification, or responding to other answers. Not sure how to fix this. The following example the data can be data bound or unbound. The standard query operators are implemented as a new kind of method called extension methods. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). LINQ's Distinct() on a particular property. Booking Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. To learn more, see our tips on writing great answers. A Computer Science portal for geeks. A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. If so then how can I do that? How is LINQ to SQL protected from SQL-injection attacks? ); } else { roles = roles.Where (dp => . When to use .First and when to use .FirstOrDefault with LINQ? Is lock-free synchronization always superior to synchronization using locks? 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. What sort of strategies would a medieval military use against a fantasy giant? if (value <= 12) The "? 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! Later in the code, I want to loop through the object (alDisabledPrograms). vegan) just to try it, does this inconvenience the caterers and staff? For example, you might use them like this: var query = items.Where( x => x. SomeProperty > someValue); query = query.If( searchByOtherProperty, q => q.Where( x => x. OtherProperty == otherValue); This is a where, so you should use a strongly typed list. "We, who've been connected by blood to Prussia's throne and people since Dppel". LinqExpression()_linq expression_maiker-. Find centralized, trusted content and collaborate around the technologies you use most. You can see that the type of the query variable is the same in both forms: IEnumerable. Condition? Asking for help, clarification, or responding to other answers. How to show that an expression of a finite type must be one of the finitely many possible values? value of a Boolean expression. Php having trouble with the if, else statement . Minimising the environmental effects of my dyson brain. You can perform the where separately from the main query: You need to declare the result variable before the first if-else. 1 solution Solution 1 You don't need LINQ or a ternary operator. 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. Does a summoned creature play immediately after being summoned by a ready action? Why is this sentence from The Great Gatsby grammatical? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. With Linq, can I use a conditional statement inside of a Where extension method? 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? However, a certain dynamic can also be realized through the method or collection method. Acidity of alcohols and basicity of amines, Theoretically Correct vs Practical Notation. Not the answer you're looking for? 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 ""; } For this example I have used of Northwind database that you can download using the link given below. available from Rexburg Motor Sports in Rexburg, Idaho. The region and polygon don't match. Provide an answer or move on to the next question. To nest a conditional query, you can write the in place of the list of the outside query. What if p.ConditionVariable != 0? Is there a way to choose different search criteria depending on the bool value? To learn more, see our tips on writing great answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Making statements based on opinion; back them up with references or personal experience. In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. Why are non-Western countries siding with China in the UN? For example, you must use a method call to express a query that retrieves the number of elements that match a specified condition. Provide an answer or move on to the next question. This is what the compiler does behind the scenes when you write queries by using query syntax. But as Kelsey pointed out this would work too -. . Coding example for the question If Else statement Powershell CSV-powershell. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 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. Means it is mostly used in querying purpose like fetch largest value from an array. Asking for help, clarification, or responding to other answers. rev2023.3.3.43278. 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 . Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. This is only viable if you don't need the element's value in the condition. Status = (Deals.Count() == 0 ? The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. What is Mala? 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. 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. The conditional operator (? mustang mach e dark matter grey. Don't tell someone to read the manual. The complete example code is given below. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The reason that they can have different types is because the first two declarations belong to different scopes. Why do many companies reject expired SSL certificates as bugs in bug bounties? Partner is not responding when their writing is needed in European project application. one of two values depending on the ConditionVariable will not have any value by default. Understand that English isn't everyone's first language so be lenient of bad 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. At some scenarios, there is need of conditional statement in LINQ. email is in use. All you need is C# Replacing broken pins/legs on a DIP IC package. Is this "correct". A place where magic is studied and practiced? s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID.