linq query with if else condition c#

By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. With your particular code, the answer is really simple: In general though, to apply very different queries, you could either use: Or you could maybe use the conditional operator to construct the right predicate: Move the isDup test into the Where expression itself. 0. All you need is C# Thoughts? You can perform the where separately from the main query: You need to declare the result variable before the first if-else. 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 . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. if (value <= 12) Using LINQ Method Syntax, it is a little difficult to write the join query when joining more than two data sources. 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. "No deals" : (Deals.Count() == 1 ? It be nice to have confirmation that this does work. Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. In general, the rule is to use (1) whenever possible, and use (2) and (3 . Is it possible to create a concave light? but for any clientId between 1 and 999 we want only clients with that ID. Chances are they have and don't get it. Use method syntax. 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. 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. Booking Is there a single-word adjective for "having exceptionally strong moral principles"? :" 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. What's the difference between a power rail and a signal line? A Computer Science portal for geeks. "Prospect" : (deals.Count () == 1 ? C#. 5. Linq C# If else statement. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. 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 } Connect and share knowledge within a single location that is structured and easy to search. c# This should work. What is the correct way to screw wall and ceiling drywalls? 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? Why should transaction_version change with removals? I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. I need this because I will need sorting based on Status. How Intuit democratizes AI development across teams through reusability. 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. At some scenarios, there is need of conditional statement in LINQ. With Linq, can I use a conditional statement inside of a Where extension method? Is a PhD visitor considered as a visiting scholar? How to use conditional where statements in LINQ? 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. The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. 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; In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . The Select clause is used to shape the data. Very useful if it does. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. ); } var alDisabledPrograms = roles.Descendants (.) Is your question about building the expression-tree without the arg-names or anything different I did not catch? Connect and share knowledge within a single location that is structured and easy to search. Connect and share knowledge within a single location that is structured and easy to search. LINQ's Distinct() on a particular property. LINQ (Language Integrated Query) is a Microsoft programming model and methodology that essentially adds formal query capabilities into Microsoft .NET-based programming languages. Not the answer you're looking for? Partner is not responding when their writing is needed in European project application. "Client" : "Other")) 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?). Condition? 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. 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 ""; } 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 . At runtime, if a boolean condition evaluates to true, then the code block will be executed, otherwise not. return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. { toprint = "Below"; } In my case, I wanted to keep the elements which met my criteria and log the ones that didn't without iterating multiple times. If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. select p.PAge.Value).FirstOrDefault(); But as Kelsey pointed out this would work too -. Each { } gets its own scope. In code, the commented part is what I need to solve Is there a way to write such query in LINQ? rev2023.3.3.43278. rev2023.3.3.43278. Do you need your, CodeProject, Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Making statements based on opinion; back them up with references or personal experience. If so then how can I do that? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Hello, yes you can use LINQ to query data in a DataGridView. How to use if else statement in combobox in VB.NET. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. 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. They are required. / E.S. +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. 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. Why do many companies reject expired SSL certificates as bugs in bug bounties? //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 . Is this "correct". Does a summoned creature play immediately after being summoned by a ready action? Execute the query. I'll explain in detail. When to use .First and when to use .FirstOrDefault with LINQ? Means it is mostly used in querying purpose like fetch largest value from an array. Check this example. Do I need a thermal expansion tank if I already have a pressure tank? 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. How to show that an expression of a finite type must be one of the finitely many possible values? I tried to initially var result = null but C# didn't like that. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. There are there Contains Methods available in C# and they are implemented in two different namespaces. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Not the answer you're looking for? If you want to use if/else conditions, you can use something like this. What if I have more than two cases, is there possibility to do that? The region and polygon don't match. if p.conditionVariable == 0 the following remains the same. data source) contains a specified element or not. See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. The reason that they can have different types is because the first two declarations belong to different scopes. Is a collection of years plural or singular? Select Asking for help, clarification, or responding to other answers. Php if else statement autamaticaly goes to else part. Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? This is what the compiler does behind the scenes when you write queries by using query syntax. :) returns rev2023.3.3.43278. In the below example, we are using the LINQ Method Syntax to . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Do you need your, CodeProject, Why do small African island nations perform better than African continental nations, considering democracy and human development? : is nothing but if else else if else. Let me know if you need any help with this query. public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? What is Mala? I'm adding accountRootTypes as param inside the query if we keep it null it's returning 'Nullable object must have a value' how can I do the condition here. if (value >= 22) Subscribe to my channel too if you hadn't done it already for more updates. I have a scenario where table2 has a column called ConditionVariable and id. I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. 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. July 7, 2021 In c++, linq, linq-to-sql 6 Comments Is it possible to use If Else conditional in a LINQ query? s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? 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. Why should transaction_version change with removals? LINQ simplifies the queries by offering a consistent model for working with data across various kinds of sources and formats. ); } else { roles = roles.Where (dp => . But my case is, if conditionvariable > 0. Some queries must be expressed as method calls. Don't tell someone to read the manual. The conditional operator (? I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. Does Counterspell prevent from any further spells being cast on a given turn? 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 ? @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. For this example I have used of Northwind database that you can download using the link given below. I need the record with id equals to that conditionVariable. This Don't tell someone to read the manual. Thanks for contributing an answer to Stack Overflow! LINQ query syntax always ends with a Select or Group clause. 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. LINQ queries can be applied for CRUD operations . Home; Mine; Mala Menu Toggle. rev2023.3.3.43278. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Acidity of alcohols and basicity of amines. However, a certain dynamic can also be realized through the method or collection method. What's the difference between a power rail and a signal line? You can call them directly by using method syntax instead of query syntax. Why are non-Western countries siding with China in the UN? A Computer Science portal for geeks. code - block - 1 : code - block - 2. There are three forms of if.else statements in C++. We have a DataGridView Column named Country. Making statements based on opinion; back them up with references or personal experience. 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. ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. How to show that an expression of a finite type must be one of the finitely many possible values? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The variable is limited to the block it is declared in. 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 : Do new devs get fired if they can't solve a certain bug? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Which method performs better: .Any() vs .Count() > 0? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. In the above syntax, a condition is an expression. dateTo, List<AccountRootType> accountRootTypes = null . This video gives an idea on usage of If condition in LINQ through a simple scenario. So we should be getting this as output from both queries. If the data source contains the specified element, then it returns true else returns false. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. string toprint = string.Empty; The content must be between 30 and 50000 characters. Why are non-Western countries siding with China in the UN? 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 can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? How would I run an async Task method synchronously? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. not an object? The output from the two examples is identical. 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. Provide an answer or move on to the next question. Can I tell police to wait and call a lawyer when served with a search warrant? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Asking for help, clarification, or responding to other answers. Find centralized, trusted content and collaborate around the technologies you use most. The following examples demonstrate some simple LINQ queries by using each approach listed previously. 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. 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 . The following example shows a simple query expression and the semantically equivalent query written as a method-based query. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. - 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 By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You're welcome to try, of course Answer above is not suitable for complicate Linq expression. . 1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. If you want to share one variable between scopes, you'll need to declare it outside. 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 ? dateFrom, DateTimeOffset? Find centralized, trusted content and collaborate around the technologies you use most. Chances are they have and don't get it. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. Does a barbarian benefit from the fast movement ability while wearing medium armor? Isn't the result of a LINQ query an IEnumerable<>? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. 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). @Tudor, I can't understand the performance problem. from dbo. available from Rexburg Motor Sports in Rexburg, Idaho. What if p.ConditionVariable != 0? 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 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. 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. Why are non-Western countries siding with China in the UN? @ile - Absolutely, you just need to use some parenthesis.. The ValueHolder factor is the same variable created from the from operator. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. @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. Coding example for the question If Else statement Powershell CSV-powershell. Youll be auto redirected in 1 second. Connect and share knowledge within a single location that is structured and easy to search. Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. All LINQ query operations consist of three distinct actions: Obtain the data source. Find centralized, trusted content and collaborate around the technologies you use most. In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. This video gives an idea on usage of If condition in LINQ through a simple scenario. Is a collection of years plural or singular? Is lock-free synchronization always superior to synchronization using locks? For more information about extension methods, see Extension Methods. If you are using LinQ with EF Core, an easy example can be this-. 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. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? These are all the standard query operators. Dynamic or operation. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. How to follow the signal when reading the schematic? How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Replacing broken pins/legs on a DIP IC package. Syntax. Why are physically impossible and logically impossible concepts considered separate in terms of probability? The conditional operator (? The following example the data can be data bound or unbound. To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. If p.ConditionVariable != 0, I need to get the record from table2 with id == ConditionVariable. We have specified two where conditions in both linq and lambda queries. email is in use. In Stored Procedure we use if Cond. To learn more, see our tips on writing great answers. Modified today. LinqExpression()_linq expression_maiker-. 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.

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