linq query with if else condition c# linq query with if else condition c#

+1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". I know this will probably be a newbie question. Home; Mine; Mala Menu Toggle. But my case is, if conditionvariable > 0. Is it possible to create a concave light? In my case, I wanted to keep the elements which met my criteria and log the ones that didn't without iterating multiple times. Thanks! Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. Join Operators These LINQ query operators are used to combine multiple sequence into one sequence just like joins in SQL queries. Why do small African island nations perform better than African continental nations, considering democracy and human development? Acidity of alcohols and basicity of amines. Connect and share knowledge within a single location that is structured and easy to search. Why do many companies reject expired SSL certificates as bugs in bug bounties? I tried to initially var result = null but C# didn't like that. rev2023.3.3.43278. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. data source) contains a specified element or not. All you need is C# @value= TotalBookingPrice Finite abelian groups with fewer automorphisms than a subgroup. Asking for help, clarification, or responding to other answers. More info about Internet Explorer and Microsoft Edge. With Linq, can I use a conditional statement inside of a Where extension method? This applies the condition3 only if condition2 is false. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Which method performs better: .Any() vs .Count() > 0? There are three forms of if.else statements in C++. The first time result is an int, the second time I declare a string, and the third time result is undeclared. Extensions methods "extend" an existing type; they can be called as if they were instance methods on the type. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? From your application's point of view, an extension method and a regular instance method are the same. 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 : 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. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Not the answer you're looking for? Short story taking place on a toroidal planet or moon involving flying. You can see that the type of the query variable is the same in both forms: IEnumerable. 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. Some queries must be expressed as method calls. 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. Do I need a thermal expansion tank if I already have a pressure tank? What is a word for the arcane equivalent of a monastery? @NithinPaul - probably best if you post a new question, explaining exactly what you're trying to do. For more information, see Lambda Expressions. 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 ? 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 What is the correct way to screw wall and ceiling drywalls? Is it possible to rotate a window 90 degrees if it has the same length and width? There are there Contains Methods available in C# and they are implemented in two different namespaces. :) returns one of two values depending on the value of a Boolean expression. The following examples demonstrate some simple LINQ queries by using each approach listed previously. However, a certain dynamic can also be realized through the method or collection method. rev2023.3.3.43278. Then use ToList() and you can check if your list has more than one item in it. Why do small African island nations perform better than African continental nations, considering democracy and human development? 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. Find centralized, trusted content and collaborate around the technologies you use most. 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. This is only viable if you don't need the element's value in the condition. s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID. In the below example, we are using the LINQ Method Syntax to . 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. Not sure how to fix this. 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. I had a scenario like this where I had to check for null within the list itself. The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. : is nothing but if else else if else. Let me know if you need any help with this query. How do I align things in the following tabular environment? Why do many companies reject expired SSL certificates as bugs in bug bounties? What's the difference between a power rail and a signal line? Replacing broken pins/legs on a DIP IC package, Theoretically Correct vs Practical Notation. Replacing broken pins/legs on a DIP IC package. Do new devs get fired if they can't solve a certain bug? Why are physically impossible and logically impossible concepts considered separate in terms of probability? . 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 How would I run an async Task method synchronously? Does Counterspell prevent from any further spells being cast on a given turn? You need to understand that what's in the WEHRE clause is a boolean expression not a statement. "One deal" : "Many deals")), How Intuit democratizes AI development across teams through reusability. A Computer Science portal for geeks. Were sorry. I'll explain in detail. How to use conditional where statements in LINQ? 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. 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. If a question is poorly phrased then either ask for clarification, ignore it, or. 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. Is a PhD visitor considered as a visiting scholar? Is there a proper earth ground point in this switch box? Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. To understand the method-based query, let's examine it more closely. Not the answer you're looking for? If you are familiar with the generic IEnumerable interface, you know that it does not have a Where method. A limit involving the quotient of two sums. if (value >= 22) LINQ queries can be applied for CRUD operations . rev2023.3.3.43278. 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. ? Why are non-Western countries siding with China in the UN? Also you need paranthesis around the condition in the second if statement. Which is equal to: list.Where(item => Foo(item)); How Intuit democratizes AI development across teams through reusability. Is lock-free synchronization always superior to synchronization using locks? Thanks! To nest a conditional query, you can write the in place of the list of the outside query. 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!! 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. These are all the standard query operators. The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. Using a dynamic LINQ library we can do the following, Select statement at runtime (pass select statement as string) Where condition at runtime (pass where statement as string) Here in this article we will first see what happens without using a dynamic LINQ library if we are passing a SELECT Statement at runtime. Has 90% of ice around Antarctica disappeared in less than a decade? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. LINQ's Distinct() on a particular property. Making statements based on opinion; back them up with references or personal experience. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Don't tell someone to read the manual. Autor de l'entrada Per ; Data de l'entrada ice detention center colorado; https nhs vc hh cardiac surgery a linq query with if else condition c# a linq query with if else condition c# Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Regards, Nived N Happy Automation Why is this the case? @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. Use method syntax. "Client" : "Other")) Why are trials on "Law & Order" in the New York Supreme Court? Is it possible to create a concave light? public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. You can perform the where separately from the main query: You need to declare the result variable before the first if-else. 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. Is it correct to use "the" before "materials used in making buildings are"? Provide an answer or move on to the next question. +1 (416) 849-8900, where (ISSTUDENT == true ? 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 it better to return an empty object? 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 . 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. Users can follow the syntax below to use the inline if statement in JavaScript. The Select clause is used to shape the data. In the above example, we selected the each resulted string elements. 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. If the data source contains the specified element, then it returns true else returns false. 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? 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. so, if 'someCondition' is false, 'Where' will be skipped. Not the answer you're looking for? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it possible to use If Else conditional in a LINQ query? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. 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 also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. This is what the compiler does behind the scenes when you write queries by using query syntax. If that is not what you are doing, show some sample data. rev2023.3.3.43278. 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. Chakra Basics; Gemstones; Main Menu 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 . C#. Execute the query. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. :" is translated to a "case" expression and there are subqueries. Create the query. What is Mala? Use a combination of query syntax and method syntax. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. How Intuit democratizes AI development across teams through reusability. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? At some scenarios, there is need of conditional statement in LINQ. If you want to use if/else conditions, you can use something like this. C# if Statement The if statement contains a boolean condition followed by a single or multi-line code block to be executed. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement ncdu: What's going on with this second size column? Each { } gets its own scope. When to use .First and when to use .FirstOrDefault with LINQ? To learn more, see our tips on writing great answers. IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. The compiler can infer the type of num because it knows that numbers is a generic IEnumerable type. Why is this sentence from The Great Gatsby grammatical?