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

Chances are they have and don't get it. How to use conditional where statements in LINQ? Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. 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. if-else if if-else. / E.S. What's the difference between a power rail and a signal line? 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 Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is there a single-word adjective for "having exceptionally strong moral principles"? Connect and share knowledge within a single location that is structured and easy to search. Asking for help, clarification, or responding to other answers. Check this example. mustang mach e dark matter grey. The reason that they can have different types is because the first two declarations belong to different scopes. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Where is not producing IQueryable, it is producing IEnumerable. To learn more, see our tips on writing great answers. However, a certain dynamic can also be realized through the method or collection method. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. What video game is Charlie playing in Poker Face S01E07? Edit: You can make combinations like this: Status = (deals.Count () == 0 ? 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); Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. This inline expression is called a lambda expression. The reference documentation for the standard query operators in the System.Linq namespace generally uses method syntax. The region and polygon don't match. if (value == 21) Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. How do particle accelerators like the LHC bend beams of particles? If that is not what you are doing, show some sample data. email is in use. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why are non-Western countries siding with China in the UN? 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. 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. The conditional operator (? Do you need your, CodeProject, 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. If the data source contains the specified element, then it returns true else returns false. If so then how can I do that? A Computer Science portal for geeks. 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 a bug? SingleOrDefault () method will return the only element in the sequence that . Connect and share knowledge within a single location that is structured and easy to search. This condition is generally expressed using lambda expression. ncdu: What's going on with this second size column? 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. . In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . 0. Syntax: if (condition) { // code block to be executed when if condition evaluates to true } Example: if Statement In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. There are three forms of if.else statements in C++. Make use of WhereIf extenstion method avaialbe in linq, LINQ to SQL Where Clause Optional Criteria. I need to ignorefilter condition if line id is 0 and empty. The standard query operators are implemented as a new kind of method called extension methods. How to prove that the supernatural or paranormal doesn't exist? 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. @ile - Absolutely, you just need to use some parenthesis.. I need the record with id equals to that conditionVariable. After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. To learn more, see our tips on writing great answers. This should work. Query syntax and method syntax are semantically identical, but many people find query syntax simpler and easier to read. Thanks for contributing an answer to Stack Overflow! 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. Youll be auto redirected in 1 second. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Why are physically impossible and logically impossible concepts considered separate in terms of probability? Not sure how to fix this. 1 solution Solution 1 You don't need LINQ or a ternary operator. 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); What is the correct way to screw wall and ceiling drywalls? 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 translated to a "case" expression and there are subqueries. So we should be getting this as output from both queries. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. A Computer Science portal for geeks. this is excellent and should be shared all over the web, only good answer for any conditional where statement. rev2023.3.3.43278. Do new devs get fired if they can't solve a certain bug? These operators are also used for implementing paging. A limit involving the quotient of two sums. Hi all, [Using If Condition in LINQ] LINQ is a great feature for querying large datasets in faster way than normal approach. Linq-to-sql uses SqlParameter to generate SQL queries, so no you do not need to do anything extra. where ID= 94685, OTDataContext dc = new OTDataContext(); In a LINQ query, the from clause comes first in order to introduce the data source ( customers) and the range variable ( cust ). 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. : is nothing but if else else if else. Let me know if you need any help with this query. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Also you need paranthesis around the condition in the second if statement. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. The output from the two examples is identical. dateFrom, DateTimeOffset? that's it, except it has to be deals.Count() instead of Deal. Are there tables of wastage rates for different fruit and veg? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, LINQ equivalent of foreach for IEnumerable. s.StudentID == StudentUserID : (s.TutorUserID == TutorUserID && s.StudentID == StudentUserID)), where s.TutorUserID == TutorUserID && s.StudentID == StudentUserID. Making statements based on opinion; back them up with references or personal experience. Minimising the environmental effects of my dyson brain. Not the answer you're looking for? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. I have no idea what you are asking, please clarify the question. If it has any value then I need to search the id which is equal to conditionvariable in table2. Ask for this RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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! 1. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Isn't the result of a LINQ query an IEnumerable<>? Finite abelian groups with fewer automorphisms than a subgroup. This video gives an idea on usage of If condition in LINQ through a simple scenario. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. { toprint = "Normal"; } Linq C# If else statement. +1 (416) 849-8900, where (ISSTUDENT == true ? If a question is poorly phrased then either ask for clarification, ignore it, or. @Tudor, I can't understand the performance problem. if (value >= 22) 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. Is a PhD visitor considered as a visiting scholar? c# The Select clause is used to shape the data. Coding example for the question If Else statement Powershell CSV-powershell. The content must be between 30 and 50000 characters. You can perform the where separately from the main query: You need to declare the result variable before the first if-else. Using .Select and .Where in a single LINQ statement 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. I know the if/else is not correct, I put that in there to show how I'd like that to be handled. Not the answer you're looking for? The standard query operators extend IEnumerable and that is why you can write numbers.Where(). I tried to initially var result = null but C# didn't like that. rev2023.3.3.43278. / E.S. Making statements based on opinion; back them up with references or personal experience. 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 video game is Charlie playing in Poker Face S01E07? A Computer Science portal for geeks. Why are trials on "Law & Order" in the New York Supreme Court? This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. email is in use. Why do small African island nations perform better than African continental nations, considering democracy and human development? Status = (Deals.Count() == 0 ? Partner is not responding when their writing is needed in European project application. 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 we compare the inline if statement with the if . 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. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. Short story taking place on a toroidal planet or moon involving flying. if (value <= 12) LINQ to SQL avoids such . How to use if else statement in combobox in VB.NET. ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. string toprint = string.Empty; But now, since the same variable is used in all three places, there is a compiler error that the types don't match: Note, with your code your result will always be non-null. 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. Provide an answer or move on to the next question. At some scenarios, there is need of conditional statement in LINQ. You need to understand that what's in the WEHRE clause is a boolean expression not a statement. Execute the query. Is that what you want? Although it looks as if IEnumerable has been redefined to include these additional methods, in fact this is not the case. You can create a new method to check age using if else and call that method from linq Query Result=CheckAge (p.Age) public string CheckAge (int age) { if (age <= 24) return "Age is less than 24 yrs"; else if (age <= 40) return "Age is less than 40 yrs"; else if (age >= 60) return "Age is more than 60 yrs"; return ""; } from prob in table2.where (p => p.Id == p.ConditionVariable && !p.IsBlocked && p.IsActive) if p.conditionVariable == 0 the following remains the same. Connect and share knowledge within a single location that is structured and easy to search. 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. Booking This is same as a new list created. :) returns one of two values depending on the value of a Boolean expression. Dynamic or operation. Is there a way to choose different search criteria depending on the bool value? 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. LinqExpression()_linq expression_maiker-. Not the answer you're looking for? Minimising the environmental effects of my dyson brain, Time arrow with "current position" evolving with overlay number. To learn more, see our tips on writing great answers. "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. Acidity of alcohols and basicity of amines. spelling and grammar. 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. What if p.ConditionVariable != 0? Modified today. Syntax. { 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 : How to follow the signal when reading the schematic? Home; Mine; Mala Menu Toggle. What is the correct way to screw wall and ceiling drywalls? Asking for help, clarification, or responding to other answers. How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? The following example shows a simple query expression and the semantically equivalent query written as a method-based query. rev2023.3.3.43278. Is it possible to use If Else conditional in a LINQ query? When to use .First and when to use .FirstOrDefault with LINQ? 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. // Still no data is yet fetched. 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. They are required. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). :) returns 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. For more information about standard query operators, see Standard Query Operators Overview (C#). 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. 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. I need to ignore filter condition if line id is 0 and empty. value of a Boolean expression. With Linq, can I use a conditional statement inside of a Where extension method? Operator (C# Reference) [ ^] So, what have you tried to achieve? In code, the commented part is what I need to solve Is there a way to write such query in LINQ? Find centralized, trusted content and collaborate around the technologies you use most. The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. The LINQ Contains Method in C# is used to check whether a sequence or collection (i.e. Why are non-Western countries siding with China in the UN? See specs, photos and pricing on Snowmobiles at www.rexburgmotorsports.com. Does Counterspell prevent from any further spells being cast on a given turn? To get started using LINQ, all that you really have to know about extension methods is how to bring them into scope in your application by using the correct using directives. For more information about extension methods, see Extension Methods. The problem is that you are trying to use procedural control flow logic in the where clause. if p.conditionVariable == 0 the following remains the same. I think you want to make a || between conditions and table2 will be queried based on p.CondtionVariable. Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. I need this because I will need sorting based on Status. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? To understand the method-based query, let's examine it more closely. int value = (from p in dc.Patients 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 } 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Find centralized, trusted content and collaborate around the technologies you use most. Our LINQ statement where clause condition ask for rows where this column contains Germany. Very useful if it does. 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? Join Operators These LINQ query operators are used to combine multiple sequence into one sequence just like joins in SQL queries. Powershell Or Python3 - CSV file: remove row based on duplicates in a column, with IF ELSE based conditions in another column; else statement issue powershell script; The first time result is an int, the second time I declare a string, and the third time result is undeclared. Using LINQ Method Syntax, it is a little difficult to write the join query when joining more than two data sources. When to use .First and when to use .FirstOrDefault with LINQ? In Stored Procedure we use if Cond. 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. LINQ query syntax always ends with a Select or Group clause. 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 ? Were sorry. How can I change property names when serializing with Json.net? . as someone commented but in this case it is not really necessary as you have the || && operators there anyway. 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. The WHERE clause reduces to True or False, and the first expression looks supect. 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? Is there a reason for C#'s reuse of the variable in a foreach? Is your question about building the expression-tree without the arg-names or anything different I did not catch?