linq query with if else condition c#

Now please take its reference and correct your code. Asking for help, clarification, or responding to other answers. 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? What's the difference between a power rail and a signal line? / E.S. Thanks! Understand that English isn't everyone's first language so be lenient of bad The variable is limited to the block it is declared in. Use method syntax. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. SingleOrDefault () method will return the only element in the sequence that . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is it a bug? 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. Does Counterspell prevent from any further spells being cast on a given turn? Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. rev2023.3.3.43278. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. For more information, see Lambda Expressions. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! Thanks for contributing an answer to Stack Overflow! if (value >= 22) 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 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 . When to use .First and when to use .FirstOrDefault with LINQ? from prob in table2.where (p => p.Id == p.ConditionVariable && !p.IsBlocked && p.IsActive) if p.conditionVariable == 0 the following remains the same. select p.PAge.Value).FirstOrDefault(); A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. If condition2 is true, you are essentially doing && true which has no effect on the where clause. Subscribe to my channel too if you hadn't done it already for more updates. not an object? If you feel any content is violating any terms please, This site makes use of Cookies. dateTo, List<AccountRootType> accountRootTypes = null . This applies the condition3 only if condition2 is false. 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. 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. 1 solution Solution 1 You don't need LINQ or a ternary operator. Home; Mine; Mala Menu Toggle. Why do many companies reject expired SSL certificates as bugs in bug bounties? However, certain queries can only be expressed in method syntax and some of those require lambda expressions. Php having trouble with the if, else statement . How to show that an expression of a finite type must be one of the finitely many possible values? A Computer Science portal for geeks. Please Sign up or sign in to vote. Why should transaction_version change with removals? I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. Acidity of alcohols and basicity of amines. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. A Computer Science portal for geeks. For example, assigning grades (A, B, C) based on marks obtained by a student. What video game is Charlie playing in Poker Face S01E07? from dbo. How Intuit democratizes AI development across teams through reusability. To learn more, see our tips on writing great answers. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Minimising the environmental effects of my dyson brain. C#. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. We have a DataGridView Column named Country. Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. Connect and share knowledge within a single location that is structured and easy to search. Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. 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. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). 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); Some queries must be expressed as method calls. 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. To understand the method-based query, let's examine it more closely. You're welcome to try, of course Answer above is not suitable for complicate Linq expression. available from Rexburg Motor Sports in Rexburg, Idaho. Because queries return an IEnumerable, you compose them in method syntax by chaining the method calls together. Are there tables of wastage rates for different fruit and veg? The "return value" is just the expression result. Asking for help, clarification, or responding to other answers. 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. 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. Modified today. 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. Highcharts ASP.NET LINQ SQL Server VBA Spring MVC Flutter . Does a barbarian benefit from the fast movement ability while wearing medium armor? 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# We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Is it correct to use "the" before "materials used in making buildings are"? A Computer Science portal for geeks. Is a collection of years plural or singular? Optimizing Queries with LINQ . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The region and polygon don't match. The standard query operators are implemented as a new kind of method called extension methods. If a question is poorly phrased then either ask for clarification, ignore it, or. If the data source contains the specified element, then it returns true else returns false. 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?). Why are trials on "Law & Order" in the New York Supreme Court? The WHERE clause reduces to True or False, and the first expression looks supect. Should isn't does. Find centralized, trusted content and collaborate around the technologies you use most. / E.S. These are all the standard query operators. 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. Extensions methods "extend" an existing type; they can be called as if they were instance methods on the type. In a LINQ query, the from clause comes first in order to introduce the data source ( customers) and the range variable ( cust ). // Still no data is yet fetched. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. How would I run an async Task method synchronously? How Intuit democratizes AI development across teams through reusability. 1. spelling and grammar. Booking Can I tell police to wait and call a lawyer when served with a search warrant? The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. Do new devs get fired if they can't solve a certain bug? 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. 0. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? All you need is: If clientId = 0 we want ALL employees,. . In the below example, we are using the LINQ Method Syntax to . In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . Use a combination of query syntax and method syntax. s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? Is your question about building the expression-tree without the arg-names or anything different I did not catch? They are required. For more information about standard query operators, see Standard Query Operators Overview (C#). How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? dateFrom, DateTimeOffset? LINQ is a great feature for querying large datasets in faster way than normal approach. The Select clause is used to shape the data. Connect and share knowledge within a single location that is structured and easy to search. But my case is, if conditionvariable > 0. if (condition) { query = query.Where (b => b == "something else"); } 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: When to use multiple where clauses in LINQ? The content must be between 30 and 50000 characters. value of a Boolean expression. Why do small African island nations perform better than African continental nations, considering democracy and human development? Users can follow the syntax below to use the inline if statement in JavaScript. This is a where, so you should use a strongly typed list. To get started using LINQ, you do not have to use lambdas extensively. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. Making statements based on opinion; back them up with references or personal experience. Why should transaction_version change with removals? Hello, yes you can use LINQ to query data in a DataGridView. When to use .First and when to use .FirstOrDefault with LINQ? You can simply use List to create a search collection. { toprint = "Normal"; } You can see that the type of the query variable is the same in both forms: IEnumerable. Select For example, you must use a method call to express a query that retrieves the number of elements that match a specified condition. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I know this will probably be a newbie question. 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. C# if Statement The if statement contains a boolean condition followed by a single or multi-line code block to be executed. I had a scenario like this where I had to check for null within the list itself. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement Not the answer you're looking for? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Viewed 9 times. The following example the data can be data bound or unbound. 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. +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". What sort of strategies would a medieval military use against a fantasy giant? return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. Each { } gets its own scope. What if I have more than two cases, is there possibility to do that? 5. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. Understand that English isn't everyone's first language so be lenient of bad What is Mala? Asking for help, clarification, or responding to other answers. 0.00/5 (No votes) See more: C#. When to use .First and when to use .FirstOrDefault with LINQ? Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? 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 I know the if/else is not correct, I put that in there to show how I'd like that to be handled. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. @HafizH can you give a feedback of solutions below? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. This video gives an idea on usage of If condition in LINQ through a simple scenario. 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). Find centralized, trusted content and collaborate around the technologies you use most. :) returns one of two values depending on the value of a Boolean expression. So you have two results, one in if block and one in else block which are different and are not visible outside their blocks. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. The problem is that you are trying to use procedural control flow logic in the where clause. 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 more information about extension methods, see Extension Methods. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 rev2023.3.3.43278. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. rev2023.3.3.43278. 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 : Regards, Nived N Happy Automation but for any clientId between 1 and 999 we want only clients with that ID. Do you need your, CodeProject, Why should transaction_version change with removals? Isn't the result of a LINQ query an IEnumerable<>? Linq C# If else statement. 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. Acidity of alcohols and basicity of amines, Theoretically Correct vs Practical Notation. In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. This If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. "We, who've been connected by blood to Prussia's throne and people since Dppel". 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. After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. one of two values depending on the 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. It be nice to have confirmation that this does work. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. This video gives an idea on usage of If condition in LINQ through a simple scenario. Making statements based on opinion; back them up with references or personal experience. How to prove that the supernatural or paranormal doesn't exist? 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. Not sure how to fix this. @value= TotalBookingPrice this is excellent and should be shared all over the web, only good answer for any conditional where statement. Why do many companies reject expired SSL certificates as bugs in bug bounties? LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria. 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 Although it looks as if IEnumerable has been redefined to include these additional methods, in fact this is not the case. Is it possible to create a concave light? rev2023.3.3.43278. email is in use. Thanks for contributing an answer to Stack Overflow! 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!! @hanzolo any IEnumerable is also an object. At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. When to use .First and when to use .FirstOrDefault with LINQ? LINQ queries can be applied for CRUD operations . Why are trials on "Law & Order" in the New York Supreme Court? I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. "Prospect" : (deals.Count () == 1 ? ? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Are there tables of wastage rates for different fruit and veg? 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. { toprint = "Below"; } 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. Don't tell someone to read the manual. int value = (from p in dc.Patients 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. Why do small African island nations perform better than African continental nations, considering democracy and human development? There are there Contains Methods available in C# and they are implemented in two different namespaces. 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 "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. 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! What if p.ConditionVariable != 0? Very useful if it does. Can I tell police to wait and call a lawyer when served with a search warrant? 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; The num on the left of the operator is the input variable which corresponds to num in the query expression. If a question is poorly phrased then either ask for clarification, ignore it, or. - 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 Making statements based on opinion; back them up with references or personal experience. :" is translated to a "case" expression and there are subqueries. Why is this the case? 1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. Is there a reason for C#'s reuse of the variable in a foreach?

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