linq query with if else condition c#

I have no idea what you are asking, please clarify the question. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. 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. If you feel any content is violating any terms please, This site makes use of Cookies. Find centralized, trusted content and collaborate around the technologies you use most. Create the query. 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. About an argument in Famine, Affluence and Morality. How to use conditional where statements in LINQ? The "return value" is just the expression result. I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Not the answer you're looking for? 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. Find centralized, trusted content and collaborate around the technologies you use most. Is it possible to create a concave light? @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. Chances are they have and don't get it. If the data source contains the specified element, then it returns true else returns false. Then use ToList() and you can check if your list has more than one item in it. Thanks! How to prove that the supernatural or paranormal doesn't exist? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. In C# => is the lambda operator, which is read as "goes to". The "? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When to use .First and when to use .FirstOrDefault with LINQ? A Computer Science portal for geeks. Thanks! . How do particle accelerators like the LHC bend beams of particles? Is it correct to use "the" before "materials used in making buildings are"? Later in the code, I want to loop through the object (alDisabledPrograms). Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? What's the difference between a power rail and a signal line? 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 : this is excellent and should be shared all over the web, only good answer for any conditional where statement. Also you need paranthesis around the condition in the second if statement. These operators are also used for implementing paging. Not the answer you're looking for? Replacing broken pins/legs on a DIP IC package. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. This inline expression is called a lambda expression. The standard query operators extend IEnumerable and that is why you can write numbers.Where(). Use a combination of query syntax and method syntax. 1 solution Solution 1 You don't need LINQ or a ternary operator. Not the answer you're looking for? However, a certain dynamic can also be realized through the method or collection method. mustang mach e dark matter grey. Using .Select and .Where in a single LINQ statement It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Please Sign up or sign in to vote. : is nothing but if else else if else. Let me know if you need any help with this query. ncdu: What's going on with this second size column? Why should transaction_version change with removals? Coding example for the question If Else statement Powershell CSV-powershell. spelling and grammar. Can I tell police to wait and call a lawyer when served with a search warrant? LINQ simplifies the queries by offering a consistent model for working with data across various kinds of sources and formats. I need to ignorefilter condition if line id is 0 and empty. The first time result is an int, the second time I declare a string, and the third time result is undeclared. 5. 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; Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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 } Why are non-Western countries siding with China in the UN? If a question is poorly phrased then either ask for clarification, ignore it, or. "We, who've been connected by blood to Prussia's throne and people since Dppel". Is there a reason for C#'s reuse of the variable in a foreach? However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. LINQ query syntax always ends with a Select or Group clause. ); } else { roles = roles.Where (dp => . @Richard in case if i need to call a function on else condition, is it possible? We can see there is just one income between 25000 and 40000. Is a collection of years plural or singular? To learn more, see our tips on writing great answers. I have a scenario where table2 has a column called ConditionVariable and id. Subscribe to my channel too if you hadn't done it already for more updates. To understand the method-based query, let's examine it more closely. Means it is mostly used in querying purpose like fetch largest value from an array. The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. So we should be getting this as output from both queries. To learn more, see our tips on writing great answers. Thoughts? / E.S. Provide an answer or move on to the next question. LINQ is a great feature for querying large datasets in faster way than normal approach. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. You can create a new method to check age using if else and call that method from linq Query Result=CheckAge(p.Age), You can use Conditional Logic in the select, sorry i'm confuse with syntax it's my request u define it clearly, That is nothing but if(age<=24) {} else {}, http://msdn.microsoft.com/en-us/library/ty67wk28(v=VS.71).aspx. so, if 'someCondition' is false, 'Where' will be skipped. Which is equal to: list.Where(item => Foo(item)); How Intuit democratizes AI development across teams through reusability. Because queries return an IEnumerable, you compose them in method syntax by chaining the method calls together. When to use .First and when to use .FirstOrDefault with LINQ? This is a where, so you should use a strongly typed list. SingleOrDefault () method will return the only element in the sequence that . More info about Internet Explorer and Microsoft Edge. If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. How to follow the signal when reading the schematic? c# If you preorder a special airline meal (e.g. You're welcome to try, of course Answer above is not suitable for complicate Linq expression. Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria. "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. For example, assigning grades (A, B, C) based on marks obtained by a student. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. C#. 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. Minimising the environmental effects of my dyson brain. Chakra Basics; Gemstones; Main Menu dateTo, List<AccountRootType> accountRootTypes = null . To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. But as Kelsey pointed out this would work too -. The Select clause is used to shape the data. In Stored Procedure we use if Cond. How to prove that the supernatural or paranormal doesn't exist? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? 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. The following examples demonstrate some simple LINQ queries by using each approach listed previously. Viewed 9 times. If it has any value then I need to search the id which is equal to conditionvariable in table2. "One deal" : "Many deals")), How Intuit democratizes AI development across teams through reusability. The problem is that you are trying to use procedural control flow logic in the where clause. Do I need a thermal expansion tank if I already have a pressure tank? Why is this sentence from The Great Gatsby grammatical? 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. A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. Is a PhD visitor considered as a visiting scholar? 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. Some queries must be expressed as method calls. public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? . How is LINQ to SQL protected from SQL-injection attacks? if-else if if-else. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. 1. The region and polygon don't match. 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 do I align things in the following tabular environment? 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! Find centralized, trusted content and collaborate around the technologies you use most. At some scenarios, there is need of conditional statement in LINQ. @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact.