linq query with if else condition c#

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. A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? How to use conditional where statements in LINQ? Viewed 9 times. Do new devs get fired if they can't solve a certain bug? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. @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. Asking for help, clarification, or responding to other answers. Subscribe to my channel too if you hadn't done it already for more updates. dateFrom, DateTimeOffset? 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. Why are non-Western countries siding with China in the UN? A Computer Science portal for geeks. This should work. The num on the left of the operator is the input variable which corresponds to num in the query expression. Acidity of alcohols and basicity of amines, Theoretically Correct vs Practical Notation. rev2023.3.3.43278. Connect and share knowledge within a single location that is structured and easy to search. Operator (C# Reference) [ ^] So, what have you tried to achieve? Regards, Nived N Happy Automation 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'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. ConditionVariable will not have any value by default. 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. In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . Are there tables of wastage rates for different fruit and veg? LINQ . return q.OrderBy(c => c.AccountNum); } else { return q; } } Set based operations with LINQ. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. These operators are also used for implementing paging. { toprint = "Normal"; } With Linq, can I use a conditional statement inside of a Where extension method? Later in the code, I want to loop through the object (alDisabledPrograms). If you preorder a special airline meal (e.g. We have specified two where conditions in both linq and lambda queries. You can see that the type of the query variable is the same in both forms: IEnumerable. I have a scenario where table2 has a column called ConditionVariable and id. This is what the compiler does behind the scenes when you write queries by using query syntax. But as Kelsey pointed out this would work too -. Make use of WhereIf extenstion method avaialbe in linq Example if (SearchControlMain.PostingID.HasValue) query = query.Where (q => q.PostingID == SearchControlMain.PostingID); instead of above go for the below query = query.WhereIf (SearchControlMain.CategoryID.HasValue, q => q.CategoryID == SearchControlMain.CategoryID); ? Not the answer you're looking for? vegan) just to try it, does this inconvenience the caterers and staff? 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. "Client" : "Other")) Not the answer you're looking for? Minimising the environmental effects of my dyson brain. 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? What sort of strategies would a medieval military use against a fantasy giant? Do you need your, CodeProject, The region and polygon don't match. Find centralized, trusted content and collaborate around the technologies you use most. @HafizH can you give a feedback of solutions below? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Very useful if it does. Thanks for contributing an answer to Stack Overflow! 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. The variable is limited to the block it is declared in. Is there a way to choose different search criteria depending on the bool value? However, certain queries can only be expressed in method syntax and some of those require lambda expressions. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. if (value <= 12) How do you get out of a corner when plotting yourself into a corner. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Replacing broken pins/legs on a DIP IC package. A place where magic is studied and practiced? 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 : Don't tell someone to read the manual. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. +1 (416) 849-8900, where (ISSTUDENT == true ? IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Because queries return an IEnumerable, you compose them in method syntax by chaining the method calls together. Coding example for the question If Else statement Powershell CSV-powershell. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 0.00/5 (No votes) See more: C#. This inline expression is called a lambda expression. If you feel any content is violating any terms please, This site makes use of Cookies. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement What video game is Charlie playing in Poker Face S01E07? Isn't the result of a LINQ query an IEnumerable<>? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? . 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 . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Some queries must be expressed as method calls. When to use .First and when to use .FirstOrDefault with LINQ? The content posted here is free for public and is the content of its poster. Why should transaction_version change with removals? For more information about standard query operators, see Standard Query Operators Overview (C#). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. However, the query syntax must be translated into method calls for the .NET common language runtime (CLR) when the code is compiled. A Computer Science portal for geeks. Download FREE API for Word, Excel and PDF in ASP.Net: This site is started with intent to serve the ASP.Net Community by providing forums (question-answer) site where people can help each other. //queryAllCustomers is an IEnumerable<Customer> var queryAllCustomers = from cust in customers select cust; The range variable is like the iteration variable in a foreach loop except that no actual iteration . 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. All you need is: If clientId = 0 we want ALL employees,. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. There are there Contains Methods available in C# and they are implemented in two different namespaces. Our LINQ statement where clause condition ask for rows where this column contains Germany. For more information about extension methods, see Extension Methods. How would I run an async Task method synchronously? Not the answer you're looking for? 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 need to ignore filter condition if line id is 0 and empty. Status = (Deals.Count() == 0 ? The WHERE clause reduces to True or False, and the first expression looks supect. Syntax. If that is not what you are doing, show some sample data. one of two values depending on the Why do many companies reject expired SSL certificates as bugs in bug bounties? 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. 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