linq query with if else condition c# The complete example code is given below. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Check this example. What video game is Charlie playing in Poker Face S01E07? These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. 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 but for any clientId between 1 and 999 we want only clients with that ID. . 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. Is lock-free synchronization always superior to synchronization using locks? Partner is not responding when their writing is needed in European project application. In the below example, we are using the LINQ Method Syntax to . email is in use. 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 . You can see that the type of the query variable is the same in both forms: IEnumerable. 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. if "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. [Solved]-If Else statement Powershell CSV-powershell "Client" : "Other")) - 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 I need this because I will need sorting based on Status. Don't tell someone to read the manual. However, certain queries can only be expressed in method syntax and some of those require lambda expressions. When to use .First and when to use .FirstOrDefault with LINQ? linq query with if else condition c# - malabana.com Connect and share knowledge within a single location that is structured and easy to search. 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. 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. @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. These are all the standard query operators. Minimising the environmental effects of my dyson brain. Not the answer you're looking for? Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. To nest a conditional query, you can write the in place of the list of the outside query. Condition? this is excellent and should be shared all over the web, only good answer for any conditional where statement. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? 0. 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 region and polygon don't match. Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. What is Mala? LINQ is a great feature for querying large datasets in faster way than normal approach. 5. How do I align things in the following tabular environment? This video gives an idea on usage of If condition in LINQ through a simple scenario. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. 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. There is a swigly line under the result in if (result!= null) saying that the name result does not exist in the current context. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. 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 ""; } Our LINQ statement where clause condition ask for rows where this column contains Germany. The standard query operators extend IEnumerable and that is why you can write numbers.Where(). 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!! Very useful if it does. In the above syntax, a condition is an expression. Is a collection of years plural or singular? C# - LINQ: conditional Where statements | Expert Code Blog Not the answer you're looking for? If you feel any content is violating any terms please, This site makes use of Cookies. Making statements based on opinion; back them up with references or personal experience. We have a DataGridView Column named Country. To support grouping, the LINQ provides the group.by operation. Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. In C# => is the lambda operator, which is read as "goes to". 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 ? The example uses an integer array as a data source for convenience; however, the same concepts apply to other data sources also. available from Rexburg Motor Sports in Rexburg, Idaho. This is same as a new list created. I tried to initially var result = null but C# didn't like that. where ID= 94685, OTDataContext dc = new OTDataContext(); Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. C# Program to Check all Items of a Float Array is Greater than 5.0 { toprint = "Get it"; }. 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. c# - add condition inside linq query - Stack Overflow 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 / E.S. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. The num on the left of the operator is the input variable which corresponds to num in the query expression. public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? What's the difference between a power rail and a signal line? not an object? The Select clause is used to shape the data. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Viewed 9 times. 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. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement If else condition in multiple from in LINQ in C# - Stack Overflow if p.conditionVariable == 0 the following remains the same. if statement - LINQ - if condition - Stack Overflow Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. by stock number or make and model. string toprint = string.Empty; Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? In code, the commented part is what I need to solve Is there a way to write such query in LINQ? Thanks! Not sure how to fix this. To get started using LINQ, you do not have to use lambdas extensively. Operator (C# Reference) [ ^] So, what have you tried to achieve? You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. c# - Linq if/else condition? - Stack Overflow I need the record with id equals to that conditionVariable. Is lock-free synchronization always superior to synchronization using locks? Why do many companies reject expired SSL certificates as bugs in bug bounties? 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. We have specified two where conditions in both linq and lambda queries. Why should transaction_version change with removals? When to use .First and when to use .FirstOrDefault with LINQ? Why are non-Western countries siding with China in the UN? The variable is limited to the block it is declared in. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. Understand that English isn't everyone's first language so be lenient of bad Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. If the data source contains the specified element, then it returns true else returns false. Do you need your, CodeProject, C# - if, else if, else Statements - TutorialsTeacher @Richard in case if i need to call a function on else condition, is it possible? 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.