linq query with if else condition c#

Por equipe MyChat, 19 de abril de 2023

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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thanks! Why are physically impossible and logically impossible concepts considered separate in terms of probability? Understand that English isn't everyone's first language so be lenient of bad If you want to use if/else conditions, you can use something like this. 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 ? Thanks for contributing an answer to Stack Overflow! Is it possible to rotate a window 90 degrees if it has the same length and width? Why do many companies reject expired SSL certificates as bugs in bug bounties? At some scenarios, there is need of conditional statement in LINQ. 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. Does Counterspell prevent from any further spells being cast on a given turn? Is there a way to choose different search criteria depending on the bool value? Making statements based on opinion; back them up with references or personal experience. Some queries must be expressed as method calls. How to use if else statement in combobox in VB.NET. - 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 Subscribe to my channel too if you hadn't done it already for more updates. All LINQ query operations consist of three distinct actions: Obtain the data source. from dbo. 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 } Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. Why are non-Western countries siding with China in the UN? The complete example code is given below. @ile - Absolutely, you just need to use some parenthesis.. 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 . Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? What is Mala? But as Kelsey pointed out this would work too -. Please refer, IF ELSE condition in Linq Where clause using C# and VB.Net in ASP.Net, https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html. Why are non-Western countries siding with China in the UN? I need to ignorefilter condition if line id is 0 and empty. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. 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. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. Is a PhD visitor considered as a visiting scholar? rev2023.3.3.43278. 5. In code, the commented part is what I need to solve Is there a way to write such query in LINQ? 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 . In a LINQ query, the from clause comes first in order to introduce the data source ( customers) and the range variable ( cust ). 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. For more information about standard query operators, see Standard Query Operators Overview (C#). / E.S. Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. Are there tables of wastage rates for different fruit and veg? so, if 'someCondition' is false, 'Where' will be skipped. if (value <= 12) If condition2 is true, you are essentially doing && true which has no effect on the where clause. How Intuit democratizes AI development across teams through reusability. You can simply use List to create a search collection. If you preorder a special airline meal (e.g. This You need to understand that what's in the WEHRE clause is a boolean expression not a statement. Has 90% of ice around Antarctica disappeared in less than a decade? How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? SingleOrDefault () method will return the only element in the sequence that . by stock number or make and model. Later in the code, I want to loop through the object (alDisabledPrograms). The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. 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. LINQ queries can be applied for CRUD operations . int value = (from p in dc.Patients By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Some LINQ providers, such as LINQ to SQL and LINQ to XML, implement their own standard query operators and additional extension methods for other types besides 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. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). What's the difference between a power rail and a signal line? Because queries return an IEnumerable, you compose them in method syntax by chaining the method calls together. This video gives an idea on usage of If condition in LINQ through a simple scenario. 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. 0. 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. If we compare the inline if statement with the if . Can I tell police to wait and call a lawyer when served with a search warrant? What is the correct way to screw wall and ceiling drywalls? We can see there is just one income between 25000 and 40000. How to show that an expression of a finite type must be one of the finitely many possible values? Why are trials on "Law & Order" in the New York Supreme Court? Edit: You can make combinations like this: Status = (deals.Count () == 0 ? How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? 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. Is that what you want? You can call them directly by using method syntax instead of query syntax. Do you need your, CodeProject, 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. 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!! These are all the standard query operators. How to use conditional where statements in LINQ? @Richard in case if i need to call a function on else condition, is it possible? 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. Thanks! I have no idea what you are asking, please clarify the question. I attempted to place this inside a larger if/else condition but was unable to loop through alDisabledPrograms later. 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). The standard query operators extend IEnumerable and that is why you can write numbers.Where(). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. @hanzolo any IEnumerable is also an object. 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. If you feel any content is violating any terms please, This site makes use of Cookies. So you have two results, one in if block and one in else block which are different and are not visible outside their blocks. one of two values depending on the By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is a collection of years plural or singular? The WHERE clause reduces to True or False, and the first expression looks supect. The following code snippet shows how to write the query to fetch data from three data sources using the LINQ Method syntax. if-else if if-else. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. When no results are returned, you have an 'empty' list. If the data source contains the specified element, then it returns true else returns false. 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. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query 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. The site does not provide any warranties for the posted content. At some scenarios, there is need of conditional statement in LINQ. Acidity of alcohols and basicity of amines. How can I change property names when serializing with Json.net? These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. from prob in table2.where (p => p.Id == p.ConditionVariable && !p.IsBlocked && p.IsActive) if p.conditionVariable == 0 the following remains the same. Not the answer you're looking for? More info about Internet Explorer and Microsoft Edge. ncdu: What's going on with this second size column? C#. To support grouping, the LINQ provides the group.by operation. ); } var alDisabledPrograms = roles.Descendants (.) Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To learn more, see our tips on writing great answers. The ValueHolder factor is the same variable created from the from operator. Syntax. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Find centralized, trusted content and collaborate around the technologies you use most. Wrong answer. 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?

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