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

You're welcome to try, of course Answer above is not suitable for complicate Linq expression. A Computer Science portal for geeks. To learn more, see our tips on writing great answers. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? Does a barbarian benefit from the fast movement ability while wearing medium armor? Subscribe to my channel too if you hadn't done it already for more updates. 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. :" is translated to a "case" expression and there are subqueries. 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. 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. 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. There are three forms of if.else statements in C++. The output from the two examples is identical. A place where magic is studied and practiced? In the above syntax, a condition is an expression. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Don't tell someone to read the manual. At some scenarios, there is need of conditional statement in LINQ. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 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. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Because Where is producing an IQueryable, the execution is deferred until the ToList in my example so you can chain Wheres together as much as you want and then just execute it after you have passed all your conditions. In my case, I wanted to keep the elements which met my criteria and log the ones that didn't without iterating multiple times. They are required. +1 (416) 849-8900, where (ISSTUDENT == true ? 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 ? . We have specified two where conditions in both linq and lambda queries. How do I align things in the following tabular environment? / E.S. How Intuit democratizes AI development across teams through reusability. Home; Mine; Mala Menu Toggle. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Means it is mostly used in querying purpose like fetch largest value from an array. 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. The following code snippet shows how to write the query to fetch data from three data sources using the LINQ Method syntax. "We, who've been connected by blood to Prussia's throne and people since Dppel". The content must be between 30 and 50000 characters. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . . LINQ's Distinct() on a particular property. In general, the rule is to use (1) whenever possible, and use (2) and (3 . Can I tell police to wait and call a lawyer when served with a search warrant? Why are trials on "Law & Order" in the New York Supreme Court? A limit involving the quotient of two sums. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why is this sentence from The Great Gatsby grammatical? Select What is Mala? For more information, see Lambda Expressions. ? 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. 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. ); } else { roles = roles.Where (dp => . The WHERE clause reduces to True or False, and the first expression looks supect. code - block - 1 : code - block - 2. If condition2 is true, you are essentially doing && true which has no effect on the where clause. We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. . value of a Boolean expression. What is the correct way to screw wall and ceiling drywalls? 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. dateTo, List<AccountRootType> accountRootTypes = null . Thanks for contributing an answer to Stack Overflow! Finite abelian groups with fewer automorphisms than a subgroup. I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. How Intuit democratizes AI development across teams through reusability. The region and polygon don't match. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. Why do small African island nations perform better than African continental nations, considering democracy and human development? These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. In Stored Procedure we use if Cond. Some queries must be expressed as method calls. if (value == 21) Minimising the environmental effects of my dyson brain. To support grouping, the LINQ provides the group.by operation. 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. 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 To understand the method-based query, let's examine it more closely. FirstOrDefault () method will return the first element in the sequence that satisfies the specified condition or a default value if no such element is found. vegan) just to try it, does this inconvenience the caterers and staff? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria. I tried to initially var result = null but C# didn't like that. We can see there is just one income between 25000 and 40000. 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. { toprint = "Below"; } It be nice to have confirmation that this does work. In the below example, we are using the LINQ Method Syntax to . How can I change property names when serializing with Json.net? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.3.3.43278. Provide an answer or move on to the next question. The ValueHolder factor is the same variable created from the from operator. How do you get out of a corner when plotting yourself into a corner. To nest a conditional query, you can write the in place of the list of the outside query. 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. 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, 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. if-else if if-else. LINQ to SQL avoids such . Thanks for contributing an answer to Stack Overflow! By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Acidity of alcohols and basicity of amines. There is a swigly line under the result in if (result!= null) saying that the name result does not exist in the current context. The "? "Prospect" : (deals.Count () == 1 ? This If we compare the inline if statement with the if . How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. . as someone commented but in this case it is not really necessary as you have the || && operators there anyway. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. "One deal" : "Many deals")), How Intuit democratizes AI development across teams through reusability. Our LINQ statement where clause condition ask for rows where this column contains Germany. Thanks! 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!! Do new devs get fired if they can't solve a certain bug? However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. You can perform the where separately from the main query: You need to declare the result variable before the first if-else. Understand that English isn't everyone's first language so be lenient of bad You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. When no results are returned, you have an 'empty' list. Regards, Nived N Happy Automation To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2023.3.3.43278. This is only viable if you don't need the element's value in the condition. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. Optimizing Queries with LINQ . / E.S. Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Is it possible to rotate a window 90 degrees if it has the same length and width? The standard query operators extend IEnumerable and that is why you can write numbers.Where(). C# if Statement The if statement contains a boolean condition followed by a single or multi-line code block to be executed. 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 ? We have a DataGridView Column named Country. If you want to use if/else conditions, you can use something like this. if (value <= 12) I know this will probably be a newbie question. that's it, except it has to be deals.Count() instead of Deal. 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. Edit: You can make combinations like this: Status = (deals.Count () == 0 ? 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. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. When to use .First and when to use .FirstOrDefault with LINQ? Users can follow the syntax below to use the inline if statement in JavaScript. 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 num on the left of the operator is the input variable which corresponds to num in the query expression. Do new devs get fired if they can't solve a certain bug? Not the answer you're looking for? To learn more, see our tips on writing great answers. At some scenarios, there is need of conditional statement in LINQ. The site does not provide any warranties for the posted content. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Condition? Coding example for the question If Else statement Powershell CSV-powershell. Connect and share knowledge within a single location that is structured and easy to search. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. This video gives an idea on usage of If condition in LINQ through a simple scenario. 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 . Making statements based on opinion; back them up with references or personal experience. 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 How is LINQ to SQL protected from SQL-injection attacks? Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. Do I need a thermal expansion tank if I already have a pressure tank? 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. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. I need to ignore filter condition if line id is 0 and empty. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Connect and share knowledge within a single location that is structured and easy to search. A Computer Science portal for geeks. If you want to share one variable between scopes, you'll need to declare it outside. I need to reduce source code by removing below if conditions, how tofilter data in same query without using if condition? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Is it possible to create a concave light? 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 use conditional where statements in LINQ? Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. For more information about standard query operators, see Standard Query Operators Overview (C#). Now please take its reference and correct your code. What video game is Charlie playing in Poker Face S01E07? Why should transaction_version change with removals? not an object? If you preorder a special airline meal (e.g. Check this example. Is it better to return an empty object? Asking for help, clarification, or responding to other answers. A Computer Science portal for geeks. Wrong answer. When to use .First and when to use .FirstOrDefault with LINQ? Short story taking place on a toroidal planet or moon involving flying. Is your question about building the expression-tree without the arg-names or anything different I did not catch? @HafizH can you give a feedback of solutions below? Does Counterspell prevent from any further spells being cast on a given turn? The content posted here is free for public and is the content of its poster. email is in use. Do I need a thermal expansion tank if I already have a pressure tank? 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. 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. 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. Dynamic or operation. How to show that an expression of a finite type must be one of the finitely many possible values? :) returns Is lock-free synchronization always superior to synchronization using locks? How to prove that the supernatural or paranormal doesn't exist? What's the difference between a power rail and a signal line? Linq C# If else statement. If it has any value then I need to search the id which is equal to conditionvariable in table2. The example uses an integer array as a data source for convenience; however, the same concepts apply to other data sources also. c# Please Sign up or sign in to vote. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. However, a certain dynamic can also be realized through the method or collection method. one of two values depending on the Youll be auto redirected in 1 second. Do you need your, CodeProject, In code, the commented part is what I need to solve Is there a way to write such query in LINQ? 0.00/5 (No votes) See more: C#. 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. 1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. 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 : How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? if p.conditionVariable == 0 the following remains the same. "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. A Computer Science portal for geeks. 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. 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. 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. dateFrom, DateTimeOffset? The conditional operator (? I need the record with id equals to that conditionVariable. 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?). Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. If the data source contains the specified element, then it returns true else returns false. if "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. Asking for help, clarification, or responding to other answers. In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. I'll explain in detail. Why are non-Western countries siding with China in the UN? Viewed 9 times. 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). In the previous example, notice that the conditional expression (num % 2 == 0) is passed as an in-line argument to the Where method: Where(num => num % 2 == 0). by stock number or make and model. Find centralized, trusted content and collaborate around the technologies you use most. 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. If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. Is it possible to use If Else conditional in a LINQ query? select p.PAge.Value).FirstOrDefault(); When to use .First and when to use .FirstOrDefault with LINQ? LINQ simplifies the queries by offering a consistent model for working with data across various kinds of sources and formats. The first time result is an int, the second time I declare a string, and the third time result is undeclared. +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". This is what I did. Check out this New 2024 Evo Red LYNX RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. I need to ignorefilter condition if line id is 0 and empty. Not sure how to fix this. . I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. Chances are they have and don't get it. How to prove that the supernatural or paranormal doesn't exist? See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. Has 90% of ice around Antarctica disappeared in less than a decade? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Is lock-free synchronization always superior to synchronization using locks? At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. @hanzolo any IEnumerable is also an object. Connect and share knowledge within a single location that is structured and easy to search. 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. Which method performs better: .Any() vs .Count() > 0? Not the answer you're looking for? rev2023.3.3.43278. Is it possible to create a concave light? You need to understand that what's in the WEHRE clause is a boolean expression not a statement. 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. Acidity of alcohols and basicity of amines, Theoretically Correct vs Practical Notation. 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. Each { } gets its own scope. To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. Using LINQ Method Syntax, it is a little difficult to write the join query when joining more than two data sources. Why is this the case? //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 . Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. from dbo. Not the answer you're looking for? This condition is generally expressed using lambda expression. I would put the p.ConditionVariable test at the beginning so taht it is the first thing checked (as && operations stop at the first failing condition. 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. 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 } The following example shows a simple query expression and the semantically equivalent query written as a method-based query. @ile - Absolutely, you just need to use some parenthesis.. Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . So we should be getting this as output from both queries. Thoughts? 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. After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. To learn more, see our tips on writing great answers. Find centralized, trusted content and collaborate around the technologies you use most. This The conditional operator (? How to follow the signal when reading the schematic? Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! 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). Connect and share knowledge within a single location that is structured and easy to search. Using .Select and .Where in a single LINQ statement Very useful if it does. ncdu: What's going on with this second size column? Why should transaction_version change with removals? I have a scenario where table2 has a column called ConditionVariable and id. What's the difference between a power rail and a signal line? For example, you must use a method call to express a query that retrieves the number of elements that match a specified condition. int value = (from p in dc.Patients 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);

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