that's it, except it has to be deals.Count() instead of Deal. 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. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. if "p.Id == p.ConditionVariable" this condition is used, it will get the records where id and Condtionvariable is same. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. Not the answer you're looking for? Optimizing Queries with LINQ . You're welcome to try, of course Answer above is not suitable for complicate Linq expression. / E.S. 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). Don't tell someone to read the manual. Find centralized, trusted content and collaborate around the technologies you use most. For a trivial example of the type of thing you can do: You can do much richer things, but I really doubt you can pick the table in the conditional. For more information about extension methods, see Extension Methods. 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. Here are some key differences between if/else and switch-case: if/else can handle multiple conditions in a single statement, whereas switch-case can only handle a single variable or expression. 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. Youll be auto redirected in 1 second. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). If you feel any content is violating any terms please, This site makes use of Cookies. value of a Boolean expression. Why do many companies reject expired SSL certificates as bugs in bug bounties? However, I suggest rethinking your code and doing somthing like following: Please also note that result will never be null, therefore, I have replaced it with Any but it is not a gist of the question, I believe. In the above example, we selected the each resulted string elements. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. from dbo. If p.ConditionVariable != 0, I need to get the record from table2 with id == ConditionVariable. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. If you want to use if/else conditions, you can use something like this. How is LINQ to SQL protected from SQL-injection attacks? Short story taking place on a toroidal planet or moon involving flying. Why should transaction_version change with removals? IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? LINQ query syntax always ends with a Select or Group clause. 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? The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 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. Making statements based on opinion; back them up with references or personal experience. Is a collection of years plural or singular? 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. 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. To learn more, see our tips on writing great answers. Chakra Basics; Gemstones; Main Menu 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. What is Mala? if (value <= 12) rev2023.3.3.43278. A limit involving the quotient of two sums. Some queries must be expressed as method calls. At some scenarios, there is need of conditional statement in LINQ. Is it possible to create a concave light? A Computer Science portal for geeks. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. Thanks for contributing an answer to Stack Overflow! Our LINQ statement where clause condition ask for rows where this column contains Germany. The WHERE clause reduces to True or False, and the first expression looks supect. Minimising the environmental effects of my dyson brain. 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. 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. Acidity of alcohols and basicity of amines. How to follow the signal when reading the schematic? Use a combination of query syntax and method syntax. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. I need this because I will need sorting based on Status. Short story taking place on a toroidal planet or moon involving flying. 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 Asking for help, clarification, or responding to other answers. We have specified two where conditions in both linq and lambda queries. mustang mach e dark matter grey. one of two values depending on the Why do small African island nations perform better than African continental nations, considering democracy and human development? Does Counterspell prevent from any further spells being cast on a given turn? The region and polygon don't match. 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. @Tudor, I can't understand the performance problem. The content must be between 30 and 50000 characters. @HafizH can you give a feedback of solutions below? C#. Is a PhD visitor considered as a visiting scholar? Making statements based on opinion; back them up with references or personal experience. not an object? string toprint = string.Empty; Thanks! You can select the whole object as it is or only some properties of it. How to use if else statement in combobox in VB.NET. "No deals" : (Deals.Count() == 1 ? public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? We can see there is just one income between 25000 and 40000. In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. How do you get out of a corner when plotting yourself into a corner. I tried to initially var result = null but C# didn't like that. If a question is poorly phrased then either ask for clarification, ignore it, or. In the below example, we are using the LINQ Method Syntax to . Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. Does Counterspell prevent from any further spells being cast on a given turn? @value= TotalBookingPrice Connect and share knowledge within a single location that is structured and easy to search. c# If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. Booking "Prospect" : (deals.Count () == 1 ? You need to understand that what's in the WEHRE clause is a boolean expression not a statement. Viewed 9 times. rev2023.3.3.43278. How to prove that the supernatural or paranormal doesn't exist? select p.PAge.Value).FirstOrDefault(); Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. Can I tell police to wait and call a lawyer when served with a search warrant? In C# => is the lambda operator, which is read as "goes to". If so then how can I do that? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. These method calls invoke the standard query operators, which have names such as Where, Select, GroupBy, Join, Max, and Average. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The reference documentation for the standard query operators in the System.Linq namespace generally uses method syntax. The num on the left of the operator is the input variable which corresponds to num in the query expression. { toprint = "Get it"; }. . 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 only viable if you don't need the element's value in the condition. 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! My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Does a summoned creature play immediately after being summoned by a ready action? However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. Subscribe to my channel too if you hadn't done it already for more updates. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Edit: You can make combinations like this: Status = (deals.Count () == 0 ? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. However, certain queries can only be expressed in method syntax and some of those require lambda expressions. Thanks! 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 } If you preorder a special airline meal (e.g. 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. spelling and grammar. What if p.ConditionVariable != 0? Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. Why is this sentence from The Great Gatsby grammatical? There is a swigly line under the result in if (result!= null) saying that the name result does not exist in the current context. 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. @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. The "? When to use .First and when to use .FirstOrDefault with LINQ? We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. so, if 'someCondition' is false, 'Where' will be skipped. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. Isn't the result of a LINQ query an IEnumerable<>? Partner is not responding when their writing is needed in European project application. When to use .First and when to use .FirstOrDefault with 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. I have no idea what you are asking, please clarify the question. What is a word for the arcane equivalent of a monastery? In code, the commented part is what I need to solve Is there a way to write such query in LINQ? 0. A Computer Science portal for geeks. The "return value" is just the expression result. Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. The output from the two examples is identical. 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. Do I need a thermal expansion tank if I already have a pressure tank? Which is equal to: list.Where(item => Foo(item)); How Intuit democratizes AI development across teams through reusability. Is there a reason for C#'s reuse of the variable in a foreach? Find centralized, trusted content and collaborate around the technologies you use most. I need to ignorefilter condition if line id is 0 and empty. Php having trouble with the if, else statement . . Does a barbarian benefit from the fast movement ability while wearing medium armor? 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 simply use List to create a search collection. 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. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. For example, assigning grades (A, B, C) based on marks obtained by a student. You can perform the where separately from the main query: You need to declare the result variable before the first if-else. : is nothing but if else else if else. Let me know if you need any help with this query. The conditional operator (? 1 solution Solution 1 You don't need LINQ or a ternary operator. Is it better to return an empty object? ncdu: What's going on with this second size column? Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The problem is that you are trying to use procedural control flow logic in the where clause. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is it possible to rotate a window 90 degrees if it has the same length and width? For example, you might use them like this: var query = items.Where( x => x. SomeProperty > someValue); query = query.If( searchByOtherProperty, q => q.Where( x => x. OtherProperty == otherValue); @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. :) returns one of two values depending on the value of a Boolean expression. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. LinqExpression()_linq expression_maiker-. To learn more, see our tips on writing great answers. Thoughts? Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Why are trials on "Law & Order" in the New York Supreme Court? I know this will probably be a newbie question. 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. . 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. Also you need paranthesis around the condition in the second if statement. 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. @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. This applies the condition3 only if condition2 is false. vegan) just to try it, does this inconvenience the caterers and staff? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy.

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