In the above example, we selected the each resulted string elements. ConditionVariable will not have any value by default. This is what the compiler does behind the scenes when you write queries by using query syntax. 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 . Also you need paranthesis around the condition in the second if statement. The content you requested has been removed. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. With Linq, can I use a conditional statement inside of a Where extension method? 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. b : c) - however, I don't know if it will work with your different queries like that (after all, how would your write the TSQL?). What is the correct way to screw wall and ceiling drywalls? More info about Internet Explorer and Microsoft Edge. The site does not provide any warranties for the posted content. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The reason that they can have different types is because the first two declarations belong to different scopes. Does Counterspell prevent from any further spells being cast on a given turn? if (value >= 22)
Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. Acidity of alcohols and basicity of amines. For more information about standard query operators, see Standard Query Operators Overview (C#). 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 I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. The standard query operators are implemented as a new kind of method called extension methods. 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 . Why should transaction_version change with removals? Extensions methods "extend" an existing type; they can be called as if they were instance methods on the type. { toprint = "Get it"; }. @hanzolo any IEnumerable is also an object. If you preorder a special airline meal (e.g. 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? Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. A Computer Science portal for geeks. 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. @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. Is your question about building the expression-tree without the arg-names or anything different I did not catch? Use method syntax. Making statements based on opinion; back them up with references or personal experience. A limit involving the quotient of two sums. LINQ query is great feature helping to query the large datasets much faster.There are certain times where we had to use a conditional statement in LINQ query. Then use ToList() and you can check if your list has more than one item in it. 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. How to show that an expression of a finite type must be one of the finitely many possible values? If you want to share one variable between scopes, you'll need to declare it outside. :) returns 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 output from the two examples is identical. Linq C# If else statement. Why do small African island nations perform better than African continental nations, considering democracy and human development? I know this will probably be a newbie question. If that is not what you are doing, show some sample data. To find an item in a list by LINQ in C#, you can use the FirstOrDefault () or SingleOrDefault () methods. This is only viable if you don't need the element's value in the condition. Asking for help, clarification, or responding to other answers. LINQ simplifies the queries by offering a consistent model for working with data across various kinds of sources and formats. At some scenarios, there is need of conditional statement in LINQ. Status = (Deals.Count() == 0 ? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. email is in use. This is same as a new list created. value of a Boolean expression. Understand that English isn't everyone's first language so be lenient of bad
I tried to initially var result = null but C# didn't like that. 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. The region and polygon don't match. Syntax. Condition? { toprint = "Below"; }
I know the if/else is not correct, I put that in there to show how I'd like that to be handled. Do you need your, CodeProject,
What if p.ConditionVariable != 0? Please Sign up or sign in to vote. The following example the data can be data bound or unbound. LINQ . The variable is limited to the block it is declared in. return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. For more information, see Lambda Expressions. Use a combination of query syntax and method syntax. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This
You can simply use List to create a search collection. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To support grouping, the LINQ provides the group.by operation. This condition is generally expressed using lambda expression. The reference documentation for the standard query operators in the System.Linq namespace generally uses method syntax. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Does Counterspell prevent from any further spells being cast on a given turn? You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. About an argument in Famine, Affluence and Morality. We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. I have a scenario where table2 has a column called ConditionVariable and id. At some scenarios, there is need of conditional statement in LINQ. Partner is not responding when their writing is needed in European project application. Because the Linq query is mainly a strong type of query, it is difficult to achieve dynamic stitching like SQL statements. The conditional operator (? Do I need a thermal expansion tank if I already have a pressure tank? When to use .First and when to use .FirstOrDefault with LINQ? if (value <= 12)
1 solution Solution 1 The problem is that you are trying to use procedural control flow logic in the where clause. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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# "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. 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
